Dissertationen zum Thema „LA-ICP-MS/MS“
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Izmer, Andrei. „Method development using ICP-MS and LA-ICP-MS and their application in environmental and material science“. [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981659799.
Der volle Inhalt der QuelleFar, Johann. „Contribution à la caractérisation du sélénométabolome de levures enrichies en sélénium de la chromatographie liquide multidimensionnelle et la spectrométrie de masse ICP MS (Inductively Coupled Plasma Mass Spectrometry), ICP MS multicollecteur et électrospray MS/MS“. Pau, 2010. http://www.theses.fr/2010PAUU3004.
Der volle Inhalt der QuelleSelenium-rich yeast (Saccharomyces cerevisiae) is the most popular form of supplemented selenium because of its putative anticancer properties. This thesis offers a contribution to the characterization of selenometabolome (the entirety of the low molecular weight selenium-containing metabolites) owing to the development of multidimensional liquid chromatography with parallel detection by ICP MS and electrospray high-resolution MSn. The developed methods permitted to obtain a selenometabolome’s fingerprint including the identity of over 50 selenium metabolites, the most exhaustive list so far, and to obtain a deeper insight into the Se metabolic pathways in yeast. Besides, isotopic signatures obtained by multicollector ICP MS associated with the selenometabolome fingerprint allowed the discrimination of Se-rich yeast samples according to their origin
Bertotti, Anelise Losangela. „Lu-Hf em zircão por LA-MC-ICP-MS“. reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/56296.
Der volle Inhalt der QuelleCurrently the methodology of Lu-Hf is one of the most widely used in geochronology, especially in in situ analysis in zircon by LA-ICP-MS. The interest in the application of this methodology, when it has a system like LA-ICP-MS, should be consigned to relative simplicity, sensitivity and speed of analysis. The high concentration and low mobility of Hf in zircon, provide isotopic ratios and model ages highly accurate that can support not only important inferences about the age of mantle extraction, but also as to its possible evolutionary history, provenance and related studies. Thus, the thesis project was elaborated based on main objectives, learning, implementation and application of Lu-Hf methodology in zircon by ICP-MS. Zircons from three different areas, previously dated by U-Pb method, were analyzed: Capivarita Anorthosite (Brazil), Aburrá Ophiolite (Colombia) and Camamu Basin (Brazil). The Lu-Hf in situ analyses were performed using equipments such as Neptune ICP-MS (ThermoFinnigan), and lasers Excimer 193 nm (ArF, GeoLas) and UP 213 (Nd: YAG, New Wave). The studied ophiolite consists of ultramafic and mafic rocks. Analyses of 12 grains revealed Hf(t) between +2.01 and +5.35, while the TDM model ages values resulted in a range between 1.15 and 1.44 Ga, suggesting the presence of a juvenile magma with possible crustal contamination and strong affinity with the rocks of the Rondonian-San Ignacio Province. Magmatic and metamorphic zircons from Capivarita Anorthosite, located in the NE portion of the Sul-Rio-Grandense Shield, were part of a comparison study to verify the reproducibility of obtained data by Lu-Hf methodology developed in the LGI. Analyses were performed first in the LGI-UFGRS (Brazil) and then at MAFIIC-MUN (Canada). Results from both laboratories show good reproducibility, TDM ages and Hf(t) values obtained are in agreement within experimental errors. These results provide information on the origin of anorthosite and suggested a juvenile source for the melt with some degree of Paleoproterozoic crustal contamination. Camamu Basin is related to the breakup of Gondwana and belongs to the group of sedimentary basins on the eastern Brazilian margin. Detrital zircons of Brotas and Almada Groups, related to the pre-rift and rift phases of the basin, were analyzed by U-Pb and Lu-Hf. In Brotas Group, 70% of analyzed zircons are Vendian-Cambrian age, from the Araçuaí-West Congo Belt taking into account the paleocurrent measurements from S-SW to N-NE. In Almada Group, the main sources of the zircons are Paleoproterozoic and Archean, with direct provenance from the basement adjacent to West Camamu Basin which is consistent with the paleocurrent measurements from west to east of the studied units. The analyzed Paleoproterozoic and Archean zircons, even the Neoproterozoic and Eopaleozoic show a strong reworked crustal component with small contribution of juvenile crust. However, the Lu-Hf methodology by LA-ICP-MS applied to zircons from different areas showed the potential to provide accurate and reliable data for provenance and crustal growth studies in order to resize increasingly the geochronology.
Belissont, Rémi. „Germanium and related elements in sulphide minerals : crystal chemistry, incorporation and isotope fractionation“. Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0049/document.
Der volle Inhalt der QuelleGermanium is a critical metalloid in many high-tech industries, especially for the energy transition and the communication sector. Being distinctly siderophile, lithophile, chalcophile and organophile, Ge can be a particularly useful geochemical tracer. This thesis aims at understanding the Ge geochemistry and the factors controlling its concentration in Ge-bearing minerals and ore deposits. Three contrasted Ge-bearing deposits were studied, the Saint-Salvy Zn vein-type deposit, French Massif Central, the Barrigão Cu vein-type deposit, Iberian pyrite belt, Portugal, and the Kipushi Zn–Cu carbonate-hosted deposit, Central African copper-belt, D.R. Congo. The most important Ge-bearing minerals are sphalerite (up to 2580 ppm Ge), chalcopyrite (up to 5750 ppm Ge), and renierite (5.0–9.1 wt.% Ge). The results show a first order relation between the Ge content and the deposition temperature. Synchrotron-based XANES spectroscopy showed that Ge4+ occur in tetrahedral sites in the studied sulphides. Element correlations suggest that Ge is chiefly incorporated in sphalerite and chalcopyrite through coupled substitutions, e.g., 3Zn2+ ↔ Ge4+ + 2(Cu,Ag)+ and 3Fe3+ ↔ 2Ge4+ + Cu+, respectively, or via the creation of lattice vacancies, e.g., 2Zn2+ ↔ Ge4+ + ?. The positive δ74Ge–Ge content correlation observed in sphalerite from Saint-Salvy could indicate that Ge partition coefficient (KdGe) increases with temperature. Ge isotopes in sulphides yield δ74Ge values spanning from –5.72‰ to +3.67‰. The light δ74Ge compositions of Saint-Salvy and Barrigão ores appear to be related to variations in low to moderate fluid temperatures during Ge uptake in open system (e.g., fluid cooling), while the trend towards heavy δ74Ge compositions observed at Kipushi likely translates a Rayleigh fractionation effect during ore formation in closed system, associated with significant fluid modification
Casiot, Corinne. „Développement de techniques analytiques couplées (HPLC-ICP-MS et EC-ICP-MS) pour la spéciation de métalloi͏̈des (arsenic, sélénium, antimoine et tellure)“. Pau, 1999. http://www.theses.fr/1999PAUU3026.
Der volle Inhalt der QuellePetersen, Jassin. „Development of paleo-oxygenation proxies : new insights into Mn/Ca ratios and pore patterns of benthic foraminiferal tests“. Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4022/document.
Der volle Inhalt der QuelleThe main objective of this thesis was to investigate how the temporal and spatial variability of bottom water oxygenation is recorded in the benthic foraminiferal test, by the Mn/Ca ratio, and by the pore parameters. To achieve this objective, Ammonia tepida, a group of pseudocryptic species, of the Lake Grevelingen (Netherlands) was mainly studied. At this site, the depth gradient is accompanied by an increase in duration and intensity of seasonal hypoxia/anoxia which indirectly influences the Mn/Ca ratio and directly the porosity of A. tepida. Our study of the Oxygen Minimum Zone in the Arabian Sea suggests the presence of a significant diagenetic effect during the transition of a Mn/Ca signal from a living foraminifer to a fossil signal. In conclusion of this PhD research, the Mn/Ca signal of a benthic foraminiferal test seems to be influenced by three temporal factors: 1) the oxygenation of the benthic ecosystem and the position of the Mn2+ zone in the interstitial water, 2) the cable bacteria activity, and 3) the period of calcification, as well as by three spatial factors which determine the position of the foraminifer with respect to the Mn2+ zone during calcification 4) the microhabitat, 5) the vertical migration of the foraminifer and 6) the bioturbation of macrofauna. In the Lake Grevelingen, the porosity of A. tepida shows a relationship with oxygenation of the benthic ecosystem. The coupling between porosity and oxygenation could be rather direct, a greater porosity allowing more intensive gas exchanges. In contrast, the relationship between the Mn/Ca ratio and the oxygenation would be more indirect, being influenced in particular by the microbial activity. The simultaneous use of these two totally independent proxies seems promising, especially because these proxies react at different time scales
Douglas, David N. „Development of a high speed, high efficiency LA-ICP-MS interface“. Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12164.
Der volle Inhalt der QuelleMarillo, Sialer Estephany. „Chemistry with lasers“. Revista de Química, 2017. http://repositorio.pucp.edu.pe/index/handle/123456789/123958.
Der volle Inhalt der QuelleThe number of applications of lasers in science is constantly growing, with applications stretching from chemistry, physics and materials science to biology and medicine. This article provides a short overview of the fundamentals of lasers and an introduction to the application of lasers and laser ablation in chemistry.
Llanos, Lorena Vanina. „Comparación de dos métodos (ICP-OES VS. ICP-MS) para la determinación de arsénico en agua“. Bachelor's thesis, Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias, 2019. http://bdigital.uncu.edu.ar/13814.
Der volle Inhalt der QuelleFil: Llanos, Lorena Vanina. Universidad Nacional de Cuyo. Facultad de Ciencias Agrarias.
Gondonneau, Alexandra. „Développement et application des techniques ICP-MS et LA-ICP-MS à la caractérisation de l'or : circulation monétaire entre Orient et Occident dans l'Antiquité et au Moyen-Age“. Orléans, 2001. http://www.theses.fr/2001ORLE2070.
Der volle Inhalt der QuelleDeLeon, Vallerie H. „Investigation of Novel Electrochemical Synthesis of Bioapatites and Use in Elemental Bone Analysis“. Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc177191/.
Der volle Inhalt der QuelleFagieh, Taghreed M. „ICP-MS determination of Zn, Cu, Fe and Mn in muscle cells as potential markers of oxidative stress“. Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/27011.
Der volle Inhalt der QuelleYang, Qichao [Verfasser]. „Paleoclimate reconstruction using LA-ICP-MS analyses of ostracods and stalagmite / Qichao Yang“. Mainz : Universitätsbibliothek Mainz, 2014. http://d-nb.info/1058425293/34.
Der volle Inhalt der QuelleFraser, Sharon Elizabeth. „EPMA, XRF and LA-ICP-MS analysis of archaeological artifacts : applications to provenancing“. Thesis, University of Manchester, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546585.
Der volle Inhalt der QuelleLöhr, Konrad. „Arraying of single cells for high throughput elemental analysis using LA-ICP-MS“. Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20573.
Der volle Inhalt der QuelleLaser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is increasingly used for single-cell analysis. However, a more widespread use of LA-ICP-MS in single cell analysis is hampered by its low throughput. Hence, in this work the throughput of single cell LA-ICP-MS was studied and improved. First, the two possible ablation modes, imaging and single spot analysis (SSA) of single cells using a large laser spot, are compared regarding their analytical figures of merit (signal to noise, precision, accuracy, throughput), as well as regarding ease of operation and data evaluation. For that, adherent 3T3 fibroblast cells were stained with two metal dyes and several dozen cells were measured using both modes. SSA showed superior characteristics regarding throughput and detection limits. Moreover, it was shown that >400 cells must be analyzed to reach satisfactory statistics for a quantitative comparison of results, which would have been too laborious. Thus, a single cell arraying step was integrated to enable automated LA-ICP-MS analysis. Two different arraying methods were evaluated: First, arraying via hydrodynamic front trapping of cells using a microfluidic device was tested, but clamping of soft PDMS-chips prevented successful arraying and it was concluded that a major redesign of the chip is necessary. Secondly, and a novel technology relying on a microdroplet arrayer in conjunction with image recognition of cells was tested and a moderate arraying throughput (550 cells per hour) and an unprecedented single-cell accuracy (>99%) was found. In a proof of principle experiment, a cell array of THP-1 suspension cells was analyzed using LA-ICP-TOF-MS and endogenic and exogenic isotopes of individual cells were detected for the first time simultaneously as isotopic fingerprints of cells with detection limits as low as hundred attogram. Finally, these results were compared to the currently more commonly used analysis method single-cell (sc)-ICP-MS.
Dubosq, Renelle. „Assessing the Structural and Alteration Controls on Gold Mineralization at Detour Lake Mine, Ontario, Canada“. Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36755.
Der volle Inhalt der QuelleMcSheehy, Shona. „Identification des espèces organiques d'arsenic et de sélénium dans les matrices biologiques par chromatographie en phase liquide couplée à la spectrométrie de masse. : ICP MS et électrospray MS/MS“. Pau, 2001. http://www.theses.fr/2001PAUU3032.
Der volle Inhalt der QuelleFigowy, Sarah. „Partage des halogènes entre silicates hydroxylés en zone de subduction : modélisation ab initio et analyse in situ par LA-ICP-MS/MS“. Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS088.
Der volle Inhalt der QuelleThe distribution of halogens in hydrous silicates representative of subduction zones is quantified by ab initio modelling and in situ analysis. The quantification of the energetic cost of the substitution of OH groups by halogens by an ab initio modelling allows studying the impact of crystal chemistry on halogen partitioning. Calculations are carried out in large systems where halogens are treated as point defects, in minor to trace concentrations. Results highlight the competition between the effects of electrostatic interactions and steric hindrance for incorporation of halogens. Interaction with alkalis, along with octahedral site occupancy, plays a major role in controlling halogen incorporation, especially in mica and amphibole. Calculation of partition coefficients predicts fractionation between halogens, and shows that pargasite, biotite and lizardite are favoured hosts for all three halogens, followed by clinochlore, tremolite and carpholite. Incorporation of halogens in dioctahedral phyllosilicates or epidote is unfavourable. A protocol for LA-ICP-MS/MS (with electron microprobe) has been proposed to quantify F, Cl and Br in metamorphic and refertilized mantle rocks from the Mont Albert ophiolitic complex (Quebec, Canada). The presence of halogen-bearing amphibole in the peridotite highlights refertilization of the mantle wedge by Cl-, Br-enriched fluids derived from the metamorphic rocks of the slab. This study sheds light on the behaviour of halogens at depth, with F mostly stored in the minerals of the slab (in mica and amphibole), whereas Cl and Br are also abundantly found in refertilized mantle rocks
Castro, Waleska. „Elemental Analysis of Biological Matrices by Laser Ablation High Resolution Inductively Coupled Plasma Mass Spectrometry (LA-HR-ICP-MS) and High Resolution Inductively Coupled Plasma Mass Spectrometry (HR-ICP-MS)“. FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/185.
Der volle Inhalt der QuelleNunes, Matheus Augusto Gonçalves. „Avaliação da calibração em LA-ICP-MS usando papel filtro para análise de plantas“. Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/4266.
Der volle Inhalt der QuelleIn this work, a new calibration strategy was investigated for the determination of As, Ba, Cd, Ce, Co, Cr, Cu, La, Mn, Ni, Pb, Se, Sr, Tl, V and Zn in medicinal plants by laser ablation and inductively coupled plasma mass spectrometry (LA-ICP-MS). The main innovation of this work was the use of filter paper for calibration, due to its similarities with botanical samples regarding to carbon concentration and distribution through both materials. These conditions allowed the use of 13C as a reference element during the analysis by LA-ICP-MS. An advantage of the proposed procedure is the possibility of using aqueous standard solutions to perform the calibration, which were placed on the filter paper and dried before ablation, avoiding the time-consuming procedures of standard preparation for LA-ICP-MS analysis. In this way, parameters as analyte signal normalization with 13C, use of dry or wet aerosol during the ablation, carrier gas flow rate, laser energy, spot size, pressure applied for pellet preparation and calibration range were investigated. Accuracy of LA-ICP-MS determinations were evaluated by analysis of certified reference materials of vegetal composition, as well as by comparison with results obtained by ICP-MS and inductively coupled plasma optical emission spectrometry (ICP OES) after microwave assisted sample digestion. Limits of detection obtained by LA-ICP-MS were 1 to 2 orders higher than those obtained by ICP-MS with pneumatic nebulization. Besides the application of LA-ICP-MS for multielement analysis of plant samples, the method was successfully applied for imaging of elemental distribution in a leaf of medicinal plant.
Neste trabalho foi investigado um procedimento de calibração para a determinação de As, Ba, Cd, Ce, Co, Cr, Cu, La, Mn, Ni, Pb, Se, Sr, Tl, V e Zn em amostras de plantas medicinais por ablação com laser combinada à espectrometria de massa com plasma indutivamente acoplado (LA-ICP-MS). A inovação do trabalho deve-se à proposta de utilização de papel filtro para calibração como um material que represente a matriz de amostras de plantas, devido principalmente às semelhanças em relação à distribuição e concentração de carbono no papel e em amostras de origem vegetal. Essas condições, associadas a outras propriedades dos elementos determinados, possibilitaram a utilização do isótopo 13C como um elemento de referência durante as análises por LA-ICP-MS. Uma das principais vantagens do procedimento proposto é a possibilidade de utilização de soluções de referência aquosas, adicionadas sobre o papel filtro (secas antes da etapa de ablação), evitando assim os métodos de preparo de padrões sólidos geralmente empregados para a calibração na técnica de LA-ICP-MS. Nesse sentido, foi avaliado o efeito da normalização do sinal de cada analito em função do 13C, a utilização de vapor úmido e vapor seco na câmara de ablação, a vazão do gás carregador, a energia e diâmetro do feixe de laser e o efeito da pressão aplicada para obtenção dos comprimidos das amostras moídas, além da faixa de calibração para cada elemento. A exatidão dos resultados obtidos por LA-ICP-MS foi avaliada através da análise de materiais de referência certificados de amostras de plantas, além da comparação com os resultados obtidos por ICP-MS e espectrometria de emissão óptica com plasma indutivamente acoplado (ICP OES), após decomposição das amostras por via úmida assistida por radiação micro-ondas. Os limites de detecção por LA-ICP-MS foram cerca de 1 a 2 ordens de magnitude superiores aos obtidos com a análise das amostras decompostas. O procedimento possibilitou a análise multielementar direta em amostras de plantas, além da determinação da distribuição dos elementos em amostra de folha de planta medicinal.
Pérez, Anne. „Bioalteration de verres basaltiques modèles : impact des sidérophores et rôle du fer“. Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1153/document.
Der volle Inhalt der QuelleThe alteration of ocean basalts partly controls the composition of seawater and of the oceanic crust which in turn influences the Earth's mantle geochemistry and may also have a significant impact on Earth's climate over a geological timescale. Regarding the existence of an extensive subsurface biosphere within the basaltic basement of the uppermost oceanic crust, the weathering of basaltic glass is now considered as a bacterial mediated process. However, the diversity and complexity of the involved mechanisms interfere with the quantification of the impact of microorganisms. This work was conducted to determine and quantify the influence of organic ligands produced by the cells, and notably siderophores on the alteration processes. Simplified experimental systems were designed to gradually mimic natural environments. Fe(III)-, Fe(II)-bearing, and Fe-free synthetic basaltic glasses were prepared and submitted to dissolution experiments at 25 C and near neutral pH conditions in (1) abiotic conditions (pure siderophore solutions and sterile bacterial medium), (2) in the presence of the bacterial strain Pseudomonas aeruginosa but isolated from the bacterial suspension by dialysis bags and (3) directly in contact with the strain. In parallel, solid analysis were conducted and LA-ICP-MS analysis protocols were notably developped. Dissolution kinetics and stoichiometry were determined by measuring elemental concentrations in solutions by ICP-OES. In abiotic conditions, the siderophore-promoted dissolution of the glass network appears to be driven by the complexation and the preferential extraction of iron (respectively aluminium for no-Fe bearing glasses). Reciprocally, in biotic systems, the siderophore production is stimulated when (1) no direct interaction between the glass and bacteria is possible, (2) the system is Fe-defficient, (3) toxic metals (e.g. aluminium) are nevertheless present and (4) iron is only available under its reduced form. In addition to the promotion of hydrolysis rates of the silicate network by siderophores, biofilms forming at the glass surfaces were shown to have a positive impact on the dissolution kinetics. These results show the specific affinity of the strain for basaltic glasses and the central role of iron under its oxidized or reduced form in the dissolution mechanisms
Voss, Mônica. „Desenvolvimento de metodologia para a determinação de contaminantes inorgânicos em polímeros por LA-ICP-MS“. Universidade Federal de Santa Maria, 2016. http://repositorio.ufsm.br/handle/1/10619.
Der volle Inhalt der QuelleIn the present work a new calibration strategy was evaluated for further determination of As, Ba, Cd, Cr, Pb, Sr and Zn in food packaging by laser ablation and inductively coupled plasma mass spectrometry (LA-ICP-MS). The main innovation in this work was the use of nylon disks for calibration, due to its similarities with polymer samples regarding to carbon concentration and distribution through both materials. These conditions allowed the use of 13C as reference element during the analysis by LA-ICP-MS. The main advantage of the proposed procedure is the possibility of using aqueous standard solutions to carry out the calibration, which were dispensed on the nylon disks and dried before ablation, avoiding the time-consuming procedures of standard preparation for LA-ICP-MS analysis. Parameters as analyte signal normalization with 13C, carrier gas flow, laser energy, spot size, scan speed, pulse frequency and different treatments of the samples were investigated. Accuracy of LA-ICP-MS determinations were evaluated by analysis of certified reference materials of polymer samples, besides comparison with results obtained by ICP-MS after microwave-induced combustion. In this work, limits of detection obtained by LA-ICP-MS were 1 to 2 orders of magnitude higher than those usually obtained by ICP-MS with pneumatic nebulization. However, the procedure enabled the direct multielement analysis in polymer samples.
No presente trabalho, foi avaliado, um procedimento de calibração para a determinação de As, Ba, Cd, Cr, Pb, Sr e Zn em embalagens poliméricas por ablação com laser acoplada à espectrometria de massa com plasma indutivamente acoplado (LA-ICP-MS). A nova proposta do trabalho é a utilização de disco de náilon para a calibração como um material que represente a matriz de amostras poliméricas, devido principalmente às semelhanças em relação a distribuição e concentração de carbono no disco de náilon e em materiais poliméricos. Essa condição possibilitou a utilização do isótopo 13C como um elemento de referência durante as análises por LA-ICP-MS. Uma das principais vantagens do procedimento proposto é a possibilidade de utilização de soluções de referência aquosas, adicionadas sobre o disco de náilon e secas antes da etapa de ablação, evitando assim o preparo de padrões sólidos, geralmente empregados para a calibração na técnica de LA-ICP-MS. Desta maneira, foi avaliado o efeito da normalização da intensidade do sinal de cada elemento em função da intensidade do 13C, a vazão do gás carregador, a energia, diâmetro do feixe laser, velocidade de varredura, frequência de pulso e os diferentes tratamentos da amostra. A exatidão dos resultados obtidos por LA-ICP-MS foi avaliada através da análise de materiais de referência de polímeros, além da comparação com os resultados obtidos por ICP-MS após combustão iniciada por micro-ondas. Os limites de detecção por LA-ICP-MS foram cerca de 1 a 2 ordens de grandeza maiores que os obtidos na análise das amostras decompostas por ICP-MS, mas o procedimento possibilitou a análise multielementar direta em amostras poliméricas.
Huynh, Thi Ngoc Suong. „Stratégie analytique combinant électrophorèse capillaire et ICP/MS pour la caractérisation des cibles biologiques de l'uranium“. Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS052/document.
Der volle Inhalt der QuelleIdentification of proteins targeted by uranium is of major concern in the determination of uranium toxicity and the development of decorporation agents. In this study, we examine the capabilities offered by hyphenated CE - ICP/MS for the detection of protein-uranium complexes. With judicious separation conditions, it is possible to obtain the uranium distribution in samples of moderate complexity. This approach was validated by using known proteins targeted by uranium (individually or in simple mixtures). Apparent equilibrium constants were determined with an accuracy similar to the ones obtained by biophysical methods. The interest of using this hyphenation was illustrated through diverse applications. The direct analysis of human serum confirmed the strong involvement of fetuin, a human glycoprotein, in the uranium blood distribution. Last but not least, the integration of this hyphenation into a multi-techniques approach (ICP/MS, DLS, CE-ICP/MS) allowed evaluating the influence of uranium on the formation of calciprotein particles and provided a proof of the preservation of protein-uranium complexes in such conditions
Bridge, Candice. „DISCRIMINATION OF FORENSIC TRACE EVIDENCE USING LASER INDUCED BREAKDOWN SPECTROSCOPY“. Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2906.
Der volle Inhalt der QuellePh.D.
Department of Chemistry
Sciences
Chemistry PhD
Tibi, Markus. „Entwicklung und Validierung einer massenspektrometrischen Isotopenverdünnungsanalyse zur direkten Multielementbestimmung in pulverförmigen Proben mittels LA-ICP-MS“. [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968969453.
Der volle Inhalt der QuelleDisch, Benoit A. „Novel method for the determination of radionuclides and their precursors in concrete using LA-ICP-MS“. Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/13692.
Der volle Inhalt der QuelleRicard, Estelle. „Datation par ICP-MS des hydrocarbures accumulés dans un réservoir par la méthode uranium/thorium/plomb“. Pau, 2010. http://www.theses.fr/2010PAUU3009.
Der volle Inhalt der QuelleTrace metal quantification in organic matrices represents a challenge for organic geochemistry to study oil-to-oil correlation, oil-to-source correlation, or to obtain information on oil migration. Estimation of crude oil expulsion timing from the rock source will have an important implication for petroleum systems modelling. A new analytical approach using a high repetition rate IR-femtosecond laser coupled to an ICP-MS detection was developed, for the direct determination of trace elements in crude oil with limited sample preparation. Limits of detection in the range of the level were typically obtained. The study of uranium, thorium and lead isotopes in petroleum matrices gives the following information: − Crude oils are very low concentrated in uranium and thorium (concentration < 1 ppb) compared to lead (10 ppb – 10 ppm) i. E. Very low U/Pb and Th/Pb ratios (< 0,05). So the determination of crude oil expulsion time is hardly realizable with classical U/Th/Pb isochrones, and needs to be confronted to lead isotopes ratios obtained from source rocks and crude oils. − Lead isotopes ratios in crude oils and source rocks measured by multi-detection ICP-MS, shows the potential of the uranium/thorium/lead system for dating hydrocarbon accumulation
Bérail, Sylvain. „Nouvelles stratégies d’introduction d’échantillon en MC-ICP-MS pour la bio-géochimie isotopique du mercure en ultra-trace“. Thesis, Pau, 2018. http://www.theses.fr/2018PAUU3019/document.
Der volle Inhalt der QuelleIn addition to the quantitative and speciation analysis, the analysis of mercury stable isotopes by MC-ICP-MS are now a tool of choice to track sources and pathways of this element in the environment. This PhD thesis presents the development of hyphenation between pre-concentration techniques and MC-ICP-MS to measure isotopic composition of mercury at ng.L-1 levels (Ultra-trace). The on-line pre-concentration strategy will create short transient signals which represent a real challenge for MC-ICP-MS. In order to solve it, a data treatment strategy for this particular signals and a correction method for the isotopic drift were developed.The hyphenation between a cold vapor generation, a dual gold amalgamation (CVG-DGA) and a MC-ICP-MS was developed to determine total mercury isotopic composition. This new technique gives external precisions ranging from 0.20 to 0.30‰ (2SD) for Hg concentration in solution of 5 ng.L-1. This PhD thesis also reports a new method to perform mercury compound specific isotopic analysis (CSIA) using a gas chromatography fitted with a PTV injector (GC-PTV) coupled to the MC-ICP-MS. This allows the isotopic analysis of several species with external precisions ranging from 0.30 to 0.40‰ (2SD) for mercury concentration down to 150 ng.L-1 in biological samples.The analytical developments proposed in this PhD thesis allows to automatically and directly measure mercury isotopic compositions at ultra-trace levels (down to 5 ng.L-1) while keeping precision compatible with main environmental questions. This will allow to analyze environmental compartment containing very low amount of mercury (natural waters, planktons,…) and then open new perspectives for a better understanding of the bio-geochimical cycle of mercury
Aguirre, Pastor Miguel Ángel. „Avances en la preparación de muestras líquidas para análisis elemental con técnicas espectrométricas basadas en plasma: ICP-OES, ICP-MS y LIBS“. Doctoral thesis, Universidad de Alicante, 2015. http://hdl.handle.net/10045/48125.
Der volle Inhalt der QuelleDidier, Amélie. „Comportement géochimique du chronomètre U-Th-Pb dans la monazite : approche par analyses in-situ au LA-ICP-MS“. Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-00966588.
Der volle Inhalt der QuelleBöhme, Maik [Verfasser]. „Synthese und analytische Charakterisierung (LA-ICP-MS) von ternären Phasen des Systems Sr-Ba-N / Maik Böhme“. Aachen : Shaker, 2011. http://d-nb.info/1074088301/34.
Der volle Inhalt der QuelleAxelsson, Mikael D. „Multi-element analysis of environmental samples using LA-ICP-MS : method developments with emphasis on calibration strategies /“. Luleå : Univ, 2002. http://epubl.luth.se/1402-1544/2002/34/index.html.
Der volle Inhalt der QuelleAyouni, Linda. „Développement de couplages chromatographie liquide -ICP-MS pour la spéciation de composés séléniés dans les compléments allimentaires“. Lyon 1, 2006. http://www.theses.fr/2006LYO10259.
Der volle Inhalt der QuelleSelenium is both a toxic and essential element for organism. Its effects depend on the dose and the chemical form absorbed. The intake of selenium nutritional supplements has become important since a clinical study showing selenium positive effects. We develop selenium speciation analysis in nutritional supplements by coupling HPLC with ICP-MS. Seven selenized species, inorganic and organic, have been separated by coupling anion exchange chromatography with ICP-MS. Two kinds of extraction methods have been developed : the one step and the sequential protocols. Organic compounds, known to be more bioavailable, have been found in majority. Selenomethionine was the principal one and, at weaker contents, selenomethylcysteine and methanseleninic acid, which have anti-cancer properties, were found too. Among unidentified species, MALDI-TOF-MS enabled to detect selenized compounds at m/z = 333 and m/z = 485 which are propably peptides
Marín, Aznar Eva. „Desenvolupament i evolució d’un sistema modificat de LA-ICP/MS per la caracterització no destructiva d’obres del Patrimoni Cultural“. Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/380159.
Der volle Inhalt der QuelleLaser Ablation -ICP/MS is a technique which presents certain advantages regarding analysis of objects from Cultural Heritage field. In one hand the Laser Ablation device provides and alternative sampling procedure that may be more suitable for the analysis in this context. On the other hand the use of the ICP/MS as a detector, allows for the determination of the elemental composition in a wide range of concentrations with a minimum amount of material required. Nevertheless, its use for the material characterization of Cultural Heritage objects is highly restricted and only some experiences are published on the field of ceramic objects, metallic and some few cases study in manuscript analysis, but not on the analysis of paintings. One of the main drawbacks is the dimensions of the objects. As a consequence there are no commercially available instruments for LA-ICP/MS, including ablation cell, that permit the analysis of large objects like artworks neither Laser Ablation systems for “in situ” sampling had not been described until recently. From an analytical point of view, there are two primary concerns when characterizing works of art composition: the heterogeneity in the distribution of the components, at the macro and micro levels, and the need to preserve the physical integrity of each object In order to accomplish the analysis of objects regardless their size and material heterogenic composition, a specific optical system and ablation cell have been designed and coupled to the ICP/MS. The whole system has been applied on two different type of objects, easel Painting and Manuscripts, and some capabilities for each application evaluated. The capability of the developed LA-ICP/MS system for the analysis of paintings was evaluated in terms of damage produced on the artwork and its potential for stratigraphic composition determination by analyzing real painting such as the portrait of a member of the Medici Family attributed to Jacopo Pontormo, and a mannerist painting attributed to Jan Massys. Regarding the application to Manuscripts the main objective was the characterization of the original material composition and the effects of some restoration interventions in the pH, corrosion and degradation, evaluating the superficial resolution and the possibility to perform maps of the distribution. Results were compared with those obtained by SEM/EDX and FTIR.
Telouk, Philippe. „Développement de la spectrométrie ICP-MS dans les domaines de l'archéologie et de la géologie : utilisation de l'ablation laser“. Lyon 1, 1993. http://www.theses.fr/1993LYO10310.
Der volle Inhalt der QuelleMarin, Rafael Coelho. „Desenvolvimento de metodologias utilizadas nas áreas de salvaguardas e forense nuclear baseadas na técnica LA-HR-ICP-MS“. Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-18022014-134520/.
Der volle Inhalt der QuelleEnvironmental sampling performed by means of swipe samples is a methodology frequently employed by International Atomic Energy Agency (IAEA) to verify if the signatory States of the Safeguards Agreements are conducing unauthorized activities. Swipe samples analysis is complementary to the Safeguards ordinary procedures used to verify the information given by the States. In this work it was described a methodology intending to strengthen the nuclear safeguards and nuclear forensics procedures. The proposal is to study and evaluate the laser ablation high resolution inductively coupled plasma mass spectrometry (LA-HR-ICP-MS) technique as an alternative to analyze the real-life swipe samples. The precision achieved through the standard(CRM -125A)measurements, represented by the relative standard deviation (RSD), was respectively 1.3 %, 0.2 % e 7.6 %for the 234U/238U, 235U/238U e 236U/238Uisotopes ratios. The percent uncertainties (u %), which covers the RSD, ranged from 3.5 % to 29.8 % to the 235U/238U measurements and from 16.6 % to 42.9 % to the 234U/238U isotope ratio. These results were compatible with former studies performed by the LA-HR-ICP-MS that analyzed real-life swipe samples collected at a nuclear facility. Swipe samples collected from several points of the nuclear facility presented enrichment level ranging from (2.3 ± 0.7) % (sample 3) to (17.3 ± 2.8) % (sample18). They also allowed detecting different enrichment levels within the facility.
MARIN, RAFAEL C. „Desenvolvimento de metodologias utilizadas nas áreas de salvaguardas e forense nuclear baseadas na técnica LA-HR-ICP-MS“. reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10589.
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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Mori, Hirotsugu. „Dinosaurian Faunas of the Cedar Mountain Formation and LA-ICP-MS Detrital Zircon Ages for Three Stratigraphic Sections“. BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2000.
Der volle Inhalt der QuelleKritikos, Aristeidis. „Compositional Systematics of Sphalerites from Western Bergslagen, Sweden“. Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301099.
Der volle Inhalt der QuelleSulfidmineralet zinkblände är, förutom att vara den huvudsakliga globala källan för zink (Zn), också ett av de viktigaste värdmineralen för de kritiska metallerna indium (In), gallium (Ga) och germanium (Ge), vilka kan utvinnas som viktiga biprodukter vid zinkbrytning. I den västligaste delen av malmprovinsen Bergslagen i Mellansverige har In-anomalier rapporterats från flera mineraliseringar. Dessa lokala In-anrikningar kan tillskrivas antingen processer verksamma innan och under den vulkaniska aktiviteten, eller senare geologiska händelser relaterade till yngre graniter. I denna studie har zinkblände från 19 olika mineraliseringar i västra Bergslagen karakteriserats med två olika system för mikrokemisk analys; elektronmikrosond (EPMA) och laserablativ induktivt kopplad plasma-masspektrometri (LA-ICP-MS). Detta har gjorts för att mäta spårelementhalter, och särskilt då för de kritiska metallerna In, Ga och Ge. Genom att använda dessa två metoder parallellt gavs också möjligheten till direkta jämförelser mellan dem vad gäller deras kapacitet för spårelementanalys av zinkblände. Resultaten verifierar att detta område är anomalt In-anrikat, medan halterna av Ga och Ge är låga och endast följer genomsnittshalterna för kontinental jordskorpa. Halterna av de övriga spårelementen varierar avsevärt, även på individuell provskala, och visar i flera fall systematiska mönster mellan vissa element. Dessa mönster tyder på att deras införlivande i zinkbländestrukturen gått via flera specifika utbytes-(substitutions-)mekanismer (t.ex. In3++ (Cu+, Ag+) ↔2Zn2+; Fe2+ + Cd2++ Mn2+ ↔3Zn2+, Cu++ Mn2++ In3+ ↔3Zn2+). Däremot kan förhöjda halter av Cd, Ag och Pd tillskrivas nano- (eller mikro-) inneslutningar av framförallt blyglans. Andra element, som As, Sn, Sb, Se, Au, TI, Ni, Te och Mo uppvisade halter under detektionsgränserna för båda analysmetoderna i nästan alla undersökta prov. Bildningsmässiga (genetiska) diskrimineringsmetoder baserade på spårelementhalter kombinerat med de geologiska och spatiella relationerna för de In-anrikade mineraliseringarna tyder på att de senare bildades genom svekofenniska vulkanisk-hydrotermala processer och därefter modifierats under svekokarelsk bergskedjebildning. Slutligen, i den direkta jämförelsen av EPMA gentemot LA-ICP-MS, visade den senare metoden signifikant bättre kapacitet för spårämnesanalys, förutsatt att ett korrekt kalibreringsprotokoll har följts.
Cahoon, Erica M. „The Discrimination and Association of Float Glass and The Quantitative Analysis of Liquids from Aerosols and Microdrops using Laser Induced Breakdown Spectroscopy“. FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/621.
Der volle Inhalt der QuelleGehres, Benjamin. „Connaissances des sociétés insulaires armoricaines par l’étude archéométrique du mobilier céramique : les réseaux d’échanges îles-continent : évolution du Néolithique à la période gallo-romaine“. Thesis, Rennes 2, 2016. http://www.theses.fr/2016REN20012/document.
Der volle Inhalt der QuelleThis thesis proposes to grasp the development of the ceramic productions and exchanges between the islands and the mainland since the Neolithic to the gallo-roman period.Through archaeometric approaches of ceramics, we question the role of the islands Brittany in the development of communication networks and movement of people and products. Thus, determining the local or exogenous nature of a production, it is possible to identify the degree of openness or withdrawal of an occupation and its integration into trade networks.For this, several analytical methods have been implemented at different scales, in relation to the typological datas of the ceramics. Macroscopic observations, on the surface treatments were carried out as microscopic observations in thin sections, which will identify the mineral assemblage in the clay, and to determine the geological and geographical origin of pottery. The study of paste is complemented with analysis by SEM-EDS, XR-D and HH-XRF. At last, a new methodological approach applied to the provenance of archaeological ceramics was developed: the analysis by LA-ICP-MS of natural or artificial inclusions in the potteries.The chronological framework of this study, from the Neolithic to the Gallo-Roman period allows to follow the evolution of the ceramic characteristics, the locations of supply and production.The interpretation of these analysis is put into perspective in a broader considerations on the status of island sites: are they production centers or dependent occupations from continental centers?
Chemnitzer, René. „Intercalation von Stickstoff und Wasserstoff in Sr2N sowie ortsabhängige Feststoffcharakterisierung mit Laserablation“. Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1154519820856-41799.
Der volle Inhalt der QuelleRichard, Manuel. „Analyse de la composition élémentaire de Pecten maximus par HR-ICP-MS Element 2 : développements méthodologiques et interprétations écologiques“. Phd thesis, Université de Bretagne occidentale - Brest, 2009. http://tel.archives-ouvertes.fr/tel-00458100.
Der volle Inhalt der QuelleCraig, Grant. „Improving the utility of LA-ICP-MS for isotope ratio analyses of single particles with application to uranium oxide“. Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21518.
Der volle Inhalt der QuelleANDRONIKOV, ALEXANDRE V., und IRINA E. ANDRONIKOVA. „SEDIMENTS FROM AROUND THE LOWER YOUNGER DRYAS BOUNDARY (SE ARIZONA, USA): IMPLICATIONS FROM LA-ICP-MS MULTI-ELEMENT ANALYSIS“. WILEY-BLACKWELL, 2016. http://hdl.handle.net/10150/621537.
Der volle Inhalt der QuelleRonzani, Anne-Laure. „Etude du couplage ablation laser - ICP-MS pour la détection des activités nucléaires; application à l'analyse de microparticules d'uranium“. Thesis, Montpellier, Ecole nationale supérieure de chimie, 2019. http://www.theses.fr/2019ENCM0001.
Der volle Inhalt der QuelleThe nuclear non-proliferation program is based among others on analysis of uranium microparticles. This thesis work consisted in developing and studying performances, limitations and application to various supports of a methodology for direct analysis of the isotopic compositions of uranium particles by means of the coupling between a nanosecond UV (213 nm) laser ablation (LA) device and an inductively coupled plasma mass spectrometer (ICP-MS). After the optimization of the experimental set-up and of the analytical methodology, several batches of uranium particles with different sizes and isotopic composition have been analyzed, especially spherical sub-micrometer uranium particles (415 ± 60 nm) produced in collaboration with the Institute de Chimie Séparative de Marcoule. For these ones, the measured isotopic ratios have been in perfect consistency with the expected values. In addition, thanks to an excellent signal to noise ratio, limits of detection are particularly low, in the attogram range for the 234U isotope. The combined standard uncertainties, around 1 % for the 235U/238U ratios and of a few percent for the 234U/238U ratios, are comparable to those obtained by other particle analysis techniques used in the laboratory. However, the ions separation technology (magnetic field) and the different detectors technologies of the ICP-MS used in this study (Faraday cups and ion counters) are not fully suited for the rapid variations (a few hundreds of µs) of the signal intensity produced by the laser ablation. This represents of major error source which limit the measurement repeatability. Therefore, we have evaluated the potential of the coupling of laser ablation device (ns, UV 193 nm) with a time of flight ICP-MS (icpTOF, Tofwerk, Thun, Switzerland) which allows the acquisition of the entire mass spectrum in 30 µs, for the analysis of micrometer-sized uranium particles. Combined standard uncertainties of approximately 0.3 % and an excellent trueness have been obtained for the measurement of the 235U/238U ratios in micrometer-sized enriched uranium particles. However, performances are still inadequate for the measurement of the minor isotopic ratios (234U/238U, 236U/238U) because of the relatively low sensibility of the instrument and of a high peak tailing effect. Finally, the developed analytical methodology has been applied, for the first time, to the direct analysis of uranium particles deposited onto a pine needle. A significant loss of sensibility compared to a deposition onto graphite disk and moderate increases of the uncertainties have been observed. However, the trueness is still satisfactory
Phukphatthanachai, Pranee. „Development and Application of IDMS Based Procedure for total Sulphur in Copper Metals and Its Alloys“. Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/19851.
Der volle Inhalt der QuelleSulphur quantification in copper and other pure metals in the past revealed a lack of SI-traceability and also showed inconsistent results, when different methods are compared. Therefore, a reference procedure is required to enable SI-traceable measurement results accompanied by a sound uncertainty budget. In this study, such a procedure was developed for the quantification of total sulphur in copper using inductively coupled plasma-isotope dilution mass spectrometry (ICP-IDMS). For solving these problems ion exchange chromatography was applied, and a sulphur-matrix separation procedure was developed. This procedure was combined with ICP-IDMS to solve difficulties with the calibration and to realize metrological concepts. An application of the IDMS procedure was realized by using the measurement results of specific copper samples values for calibrating glow discharge mass spectrometry (GDMS) and laser ablation ICP-MS (LA-ICP-MS). Both techniques are considered routine techniques. Thus, they could provide reliable results which are traceable to the SI. Additionally, a procedure based on LA-ICP-IDMS was developed to significantly reduce the sample preparation step of ICP-IDMS with sulphur-matrix separation. This procedure is less laborious and the measurement results are still SI traceable and offer a comparatively high accuracy for LA-ICP-MS. Key for this development was the innovative application of polyethylene frits as support material for the dissolved sample. Thus, the quantification of sulphur in copper samples by LA-ICP-IDMS could be realized. The essential parameters are investigated such as the absorption efficiency of the frit and matrix effects. The developed procedure was fully validated by means of the ICP-IDMS results.
Pitois, Aurélien. „Contribution au développement de nouvelles méthodes analytiques par le couplage entre l'électrophorèse capillaire et la spectrométrie de masse (ICP-MS et ESI-MS)Titre : Applications dans les domaines nucléaires et biologiques“. Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/PITOIS_Aurelien_2006.pdf.
Der volle Inhalt der QuelleThe coupling between chromatographic and electrophoretic separation techniques and mass spectrometry is used to combine the efficiency of the separation technique to the selectivity and sensitivity of the detectors. In this work, the number of applications of the CE-MS couplings has been increased. New analytical methods have been set up in the nuclear and biological fields. New analytical methods for the determination of fission products (cesium and lanthanides) have been developed by CE-ICP-MS. They enable to determine both concentration and isotopic composition of the fission products for very low detection limits (ng/mL by CE-Q-ICP-MS, pg/mL by CE-HR-ICP-MS), since all the isobaric interferences are resolved. Moreover, only some nanoliters of sample are necessary to perform the analysis. These method have been applied with success to a simulated sample of spent fuel, to a nuclear sample from PUREX process and to a leaching of MOX fuel. Then, lanthanides have been analysed by CE-ESI-MS and the capability of ESI-MS to provide structural information has been studied. Elementary information has been obtained for strong potentials. Structural information has been obtained for low potentials. Finally, a new analytical method by CE-ESI-MS for the determination of 10B-boronophenylalanine (10B-BPA) has been developed for Boron Neutron Capture Therapy (BNCT). It has been applied to the cellular lines F98 and HUVEC. This CE-ESI-MS method has been validated by HR-ICP-MS. It enables a direct quantification of the chemical form 10B-BPA in samples of limited size (some nanoliters) and for low concentrations (ng/mL). As a consequence, this CE-ESI-MS method has enabled the study of the kinetics of 10B-BPA release and uptake for the F98 cells
Jegal, Yujin. „Développement des mesures isotopiques in situ Rb-Sr par LA-ICP-MS et microsonde ionique pour la datation à petite échelle des processus géologiques“. Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0343.
Der volle Inhalt der QuelleThe new generation of laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS/MS) and SIMS IMS-1280-HR2 with high resolving powder (~40,000) allows to analyze at micro-scale level directly on minerals and resolve the isobaric overlaps of 87Rb on 87Sr by introducing a reaction gas via a reaction cell and high resolving power, respectively. Rb-Sr isotope measurements of Rb-rich minerals (e.g., micas and potassium feldspars) by in-situ methods enable to date minerals in ore deposits where datable minerals for traditional isotopic systems (e.g., U-Pb zircon) are lack and/or affected by alteration that disturbs the geochronometers. Testing these innovative approaches is the main objective of this PhD thesis. The aim of this thesis is (i) to characterize and certify the Rb-Sr isotopic values of mica and feldspar reference materials (RMs) suitable for in-situ Rb-Sr dating, (ii) to demonstrate the feasibility and capability of in-situ methods to measure Rb-Sr isotopic system by LA-ICP-MS/MS and SIMS and (iii) to apply in-situ Rb-Sr dating using the characterized RMs and optimized analytical conditions of LA-ICP-MS/MS to geological case studies. Four CRPG RMs including phlogopite Mica-Mg, biotite Mica-Fe, glauconite GL-O and potash feldspar FK-N are characterized as potential reference materials for in-situ Rb-Sr measurements by LA-ICP-MS/MS. Rb/Sr and Sr isotopic ratios of the four RMs were determined by isotope dilution TIMS and MC-ICP-MS. The RMs are assessed for their suitability for the in-situ Rb-Sr dating method. Results suggest that Mica-Mg is the most appropriate RM for dating of mica samples. Then, matrix effect of LA-ICP-MS/MS on accuracy and precision of Rb-Sr dating is investigated by using different matrix RMs (synthetic silicate glass, geological glass and mineral powder RMs) and natural mineral samples. The result shows a correlation between major element compositions of the RMs and accuracy of 87Rb/86Sr measured by LA-ICP-MS/MS. Based on this result, a new calibration approach using non matrix-matched RMs is proposed and evaluated comparing with a approach using RMs matrix-matched with target mineral samples. Finally, in-situ Rb-Sr dating by LA-ICP-MS/MS apply to case studies to constrain the timing and duration of fluid circulation processes at Quiberon detachment zone, South Armorican Massif (France). Based on the in-situ analysis of multiple mineral phases in leucogranites and associated pegmatic dykes, the results indicate that Rb-Sr ages ranges from 300.6 ± 3.8 Ma to 281.2 ± 3.8 Ma, which are younger than the known ages of emplacement of syn-tectonic leucogranites within this domain and are corresponding to the U mineralization at 270-300 Ma. Rb-Sr ages obtained for this zone indicate the global event of circulation of salty water which affected the South Armorican Domain between 300 and 270 Ma. This thesis provides the recommended 87Sr/86Sr and 87Rb/86Sr values and related uncertainties for the four tested RMs to use for in-situ Rb-Sr dating via LA-ICP-MS/MS. Finally, this work gives characterization of matrix effect and new methodological approaches for in-situ Rb-Sr dating by LA-ICP-MS/MS for samples with a variety of matrix to be further validated and applied in ore deposits
Subedi, Kiran. „Elemental Analysis of Printing Inks Using Tandem Laser- Induced Breakdown Spectroscopy and Laser Ablation Inductively Coupled Plasma Mass Spectrometry“. FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2263.
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