Bibliografie tematiche / Chromtography coupled to a mass spectrometer

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Letteratura scientifica selezionata sul tema "Chromtography coupled to a mass spectrometer"

Autore: Grafiati

Pubblicato: 14 settembre 2024

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Articoli di riviste sul tema "Chromtography coupled to a mass spectrometer"

de Moraes, Janderson Aparecido, Emanuel Carrilho e Nilson Antonio Assunção. "Homemade Capillary Electrophoresis Coupled to a Mass Spectrometer". Journal of Liquid Chromatography & Related Technologies 38, n. 1 (2 ottobre 2014): 36–43. http://dx.doi.org/10.1080/10826076.2013.864982.

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D'Ulivo, Lucia, Lu Yang, Yong-Lai Feng, John Murimboh e Zoltán Mester. "Speciation of organometals using a synchronizing GC-EIMS and GC-ICPMS system for simultaneous detection". J. Anal. At. Spectrom. 29, n. 6 (2014): 1132–37. http://dx.doi.org/10.1039/c4ja00034j.

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Accurate quantitation and characterization of organometals are successfully achieved by splitting the gas chromatography (GC) flow to both an electron ionization mass spectrometer (EIMS) and an inductively coupled plasma mass spectrometer (ICPMS).

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Wilson, Daniel A., George H. Vickers, Gary M. Hieftje e Andrew T. Zander. "Analytical characteristics of an inductively coupled plasma-mass spectrometer". Spectrochimica Acta Part B: Atomic Spectroscopy 42, n. 1-2 (gennaio 1987): 29–38. http://dx.doi.org/10.1016/0584-8547(87)80047-2.

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Furuta, Naoki, Curtis A. Monnig, Pengyuan Yang e Gary M. Hieftje. "Noise characteristics of an inductively coupled plasma-mass spectrometer". Spectrochimica Acta Part B: Atomic Spectroscopy 44, n. 7 (gennaio 1989): 649–56. http://dx.doi.org/10.1016/0584-8547(89)80063-1.

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Pulliam, Christopher J., Pu Wei, Dalton T. Snyder, Xiao Wang, Zheng Ouyang, Rafal M. Pielak e R. Graham Cooks. "Rapid discrimination of bacteria using a miniature mass spectrometer". Analyst 141, n. 5 (2016): 1633–36. http://dx.doi.org/10.1039/c5an02575c.

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Dualde, Pablo, Clara Coscollà, Agustin Pastor e Vicent Yusà. "Optimization of Resolving Power, Fragmentation, and Mass Calibration in an Orbitrap Spectrometer for Analysis of 24 Pesticide Metabolites in Urine". International Journal of Analytical Chemistry 2019 (17 aprile 2019): 1–12. http://dx.doi.org/10.1155/2019/1917369.

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Mass spectrometer parameters such as Resolving Power, type of fragmentation, and mass calibration mode were optimized in the analysis of 24 pesticide metabolites in human urine using Ultra-High Pressure Liquid Chromatography coupled to Orbitrap High-Resolution Mass Spectrometer (UHPLC-HRMS). The best results were achieved with a Resolving Power of 25,000 FWHM and by applying Collision Induced Dissociation fragmentation mode (40 eV).

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Hartmanová, L., I. Lorencová, M. Volný, P. Fryčák, V. Havlíček, H. Chmelíčková, T. Ingr e K. Lemr. "Lateral resolution of desorption nanoelectrospray: a nanospray tip without nebulizing gas as a source of primary charged droplets". Analyst 141, n. 7 (2016): 2150–54. http://dx.doi.org/10.1039/c5an02665b.

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TAKAHASHI, Junichi, e Reinosuke HARA. "Analytical features of SPQ6100 inductively coupled plasma source mass spectrometer." Analytical Sciences 4, n. 3 (1988): 331–33. http://dx.doi.org/10.2116/analsci.4.331.

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Suzuki, T., C. Kanzaki, M. Nomura e Y. Fujii. "Zinc isotope discrimination effect in inductively coupled plasma mass spectrometer". Review of Scientific Instruments 75, n. 5 (maggio 2004): 1931–33. http://dx.doi.org/10.1063/1.1702105.

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Iyer, Janaki Krishnamoorthy, Reka A. Otvos, Jeroen Kool e R. Manjunatha Kini. "Microfluidic Chip–Based Online Screening Coupled to Mass Spectrometry". Journal of Biomolecular Screening 21, n. 2 (31 agosto 2015): 212–20. http://dx.doi.org/10.1177/1087057115602648.

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Thrombin and factor Xa (FXa) are critical enzymes of the blood coagulation cascade and are excellent targets of anticoagulant agents. Natural sources present an array of anticoagulants that can be developed as antithrombotic drugs. High-resolution, online screening techniques have been developed for the identification of drug leads from complex mixtures. In this study, we have developed and optimized a microfluidic online screening technique coupled to nano–liquid chromatography (LC) and in parallel with a mass spectrometer for the identification of thrombin and FXa inhibitors in mixtures. Inhibitors eluting from the nano-LC were split postcolumn in a 1:1 ratio; half was fed into a mass spectrometer (where its mass is detected), and the other half was fed into a microfluidic chip (which acts as a microreactor for the online assays). With our platform, thrombin and FXa inhibitors were detected in the assay in parallel with their mass identification. These methods are suitable for the identification of inhibitors from sample amounts as low as sub-microliter volumes.

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Tesi sul tema "Chromtography coupled to a mass spectrometer"

Boulesteix, David. "Optimization of extraterrestrial organic matter extraction methods to detect and classify physical and (bio)chemical gnostic and agnostic bioindicators and biosignatures through a transversal analytical study". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASJ017.

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Au cours de cette thèse, nous avons fourni des éléments de réponse pour les problématiques d'exploration spatiale : i) Quelles signatures recherchons-nous pour des traces de vie et/ou une chimie prébiotique sur les surfaces planétaires de notre système solaire ? et ii) Comment pouvons-nous les détecter ? Quelle méthode de préparation des échantillons est la plus adéquate pour une analyse GC-MS spatiale ? ainsi que pour les problématiques fondamentales : i) Comment s'est déroulé la transition entre une chimie prébiotique abiotique et une chimie biotique ? Y a-t-il une limite nette ou un état de transition que l'on pourrait défnir comme « biochimie primitive » ? et ii) Quel est l'influence de chaque paramètre environnemental sur la dégradation/transformation de cette matière organique abiotique ou biotique ?L'application d'une approche transdisciplinaire a permis non seulement de préparer les instruments GC-MS spatiaux avec des analogues définit par des caractéristiques communes aux surfaces planétaires extraterrestres explorées mais aussi d'identifier des précurseurs, bioindicteurs et bisoignatures que l'on a sous catégorisé comme agnostique d'une vie quelconque ou gnostique assimilé à la vie terrestre connue.Les protocoles d'extraction de matière organique optimisés dans cette thèse ont permis l'application de protocole spatial pour une approche de métabolomique environnementale non ciblée et ainsi identifier des populations au sein des environnements analogues investigués et des molécules essentielles à l'adaptation au milieu et préservation face aux sels, irradiations et biodisponibilité de l'eau et de nutriments
During this thesis, we provided elements of answers for space exploration issues: i) What signatures are we looking for traces of life and/or prebiotic chemistry on the planetary surfaces of our solar system? and ii) How can we detect them? Which sample preparation method is most suitable for spatial GC-MS analysis? as well as for fundamental issues: i) How did the transition take place between abiotic prebiotic chemistry and biotic chemistry? Is there a clear boundary or transition state that could be defined as “primitive biochemistry”? and ii) What is the influence of each environmental parameter on the degradation/transformation of this abiotic or biotic organic matter?The application of a transdisciplinary approach has made it possible not only to prepare space GC-MS instruments with analogues defined by characteristics common to the extraterrestrial planetary surfaces explored but also to identify precursors, bioindicators and bisignatures that we have under categorized as agnostic of any life or gnostic assimilated to known earthly life.The organic matter extraction protocols optimized in this thesis allowed the application of spatial protocols for a non-targeted environmental metabolomics approach and thus identify populations within the analogous environments investigated and molecules essential for adaptation to the environment and preservation against salts, irradiation and bioavailability of water and nutrients

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Macedone, Jeffrey Harris. "Ion Transmission in the first vacuum stage of an Inductively Coupled Plasma Mass Spectrometer". BYU ScholarsArchive, 2005. https://scholarsarchive.byu.edu/etd/274.

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The inductively coupled plasma mass spectrometer (ICP-MS) is the instrument of choice for trace and ultra-trace elemental analysis. However, the ICP-MS suffers from matrix effects. Matrix effects occur when instrument response varies as the composition of the sample matrix is changed. Matrix effects, or non-spectroscopic interferences, limit the accuracy of routine analysis. Identification of the sources of matrix effects provide a basis for reducing or eliminating them. As inaccuracies in the ICP-MS are more severe than those in the ICP atomic emission spectrometer, the problem may be due, at least in part, to the vacuum interface used to couple the plasma source and mass spectrometer. The research herein is a study of matrix effect sources in the first stage of the vacuum interface. This study utilized laser-induced fluorescence of atomic species to identify factors affecting analyte transport through the sampling orifice of the vacuum interface. Several non-idealities in the performance of the interface were found. (1) Operating conditions and sample compositions can negatively affect the efficiency with which ions are extracted through the vacuum interface coupling the plasma source to the mass spectrometer. (2) The sampling cone itself was found to suppress and narrow ion distributions in the plasma. (3) Changes in the degree of ionization were identified in the first vacuum stage. The evidence of recombination and state-changing collisions was observed in the first vacuum stage at lower power settings. Matrix effects occur in the first vacuum stage, the first step of the ion extraction process. This work shows that changes in ion transport through the first vacuum stage of the vacuum interface of an ICP-MS affect the overall performance of the instrument.

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Macedone, Jeffrey Harris. "Ion transmission studies in the first vacuum stage of an inductively coupled plasma mass spectrometer /". Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd785.pdf.

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Rogers, Duane A. "Development and characterization of an inductively coupled plasma/electrospray ionization dual-source time-of-flight mass spectrometer". [Bloomington, Ind.] : Indiana University, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3386716.

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Thesis (Ph.D.)--Indiana University, Dept. of Chemistry, 2009.
Title from PDF t.p. (viewed on Jul 22, 2010). Source: Dissertation Abstracts International, Volume: 70-12, Section: B, page: 7533. Adviser: Gary M. Hieftje.

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Somers, William R. "Testing Direct Simulation Monte Carlo Methods Against the Fluid Equations in the Inductively Coupled Plasma Mass Spectrometer". Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2621.pdf.

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Radicic, William Neil. "Velocity and Temperature Characterization of the First Vacuum Stage Expansion in an Inductively Coupled Plasma - Mass Spectrometer". Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd435.pdf.

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Ma, Haibin. "Ion Transport Behaviors Upstream and Downstream from the Sampling Cone of an Inductively Coupled Plasma Mass Spectrometer". BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/2196.

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Inductively coupled plasma - mass spectrometry (ICP-MS) is the technique of choice worldwide for trace elemental determinations because of its excellent ionization ability, low detection limits and fast analysis speeds. However, the ICP-MS still suffers from some disadvantages, such as spectral overlap and severe matrix effects. Matrix effects or interferences, partly arise from changes in the analyte transmission through the interfacial region between the ICP and mass spectrometer with changes in sample matrix. Better understanding of the transmission behaviors of analyte through the sampling and skimmer cones will provide the insights needed to alleviate matrix interferences and to improve the interface design between the ICP and mass spectrometer. Laser induced fluorescence is a highly sensitive, non-invasive and element specific detection method. The research herein endeavors to explain the transport behaviors of analytes upstream and downstream from the sampling cone in an ICP-MS. The final goal of this research is to improve the consistency and efficiency with which ions are transported from an ICP source to a mass analyzer. Several issues related to analyte transmission through the sampling and skimmer cones have been explored and discussed in this dissertation. First, it is found that the existence of the sampling cone not only disturbs the local thermodynamic equilibrium of the plasma, but also changes the spatial distributions and number densities of analyte species. Second, it has been verified that the spread of analyte species in the first vacuum stage is mass-dependent and can be explained by ambiploar diffusion theory. Finally, the current research suggests that the transmission efficiencies of the skimmer cone are impacted by the nebulizer flow and first vacuum stage pressure of the ICP-MS. To better elucidate the analyte transport behaviors from the plasma to the ion detector in an ICP-MS, more investigation needs to be carried out. Further research, such as the entire measurements of analyte transmission efficiency through the skimmer cone, the variation of doubly charged ions under different plasma operational conditions, and the functions of argon metastable atoms on analyte ionization inside the plasma will require much additional work.

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Vail, Teresa M. "Rapid identification, confirmation, and quantitation using an open-air ion source coupled to a time-of-flight mass spectrometer". Scholarly Commons, 2007. https://scholarlycommons.pacific.edu/uop_etds/666.

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The ability to identify and confirm a compound using mass spectrometry usually involves time consuming sample preparation and method development. The open-air ion source DART (Direct Analysis in Real Time) can ionize compounds in the gas, solid, or liquid phase without chromatography or sample preparation due to the interactions of helium metastable atoms with gas molecules commonly found in air. The coupling of the DART to a time-of-flight (TOF) mass spectrometer allows the rapid determination of an analyte's elemental composition based on accurate mass measurement and isotope peak intensities. Mass spectrometric fragmentation data can aid in the structural identification of an analyte as compounds produce characteristic fragment-ions based on their structure. The TOP's ability to produce fragmentation spectra was compared to the more traditional tandem mass spectral method (MS/MS) considering the TOF lacks the ability to select pre-cursor ions. The TOF produced in-source CAD (collisionally activated dissociation) spectra comparable to MS/MS spectra for three well known pharmaceuticals acetaminophen, phenylbutazone and clenbuterol. Further structural confirmation was explored through a determination of the number of active hydrogen atoms in an analyte molecule achieved by hydrogen/deuterium (H/D) exchange by treatment with deuterium oxide (D20) in the DART sample gap. Mass spectra acquired in the presence of D20 of analytes containing active hydrogen atoms associated with hydroxyl, amino and carboxylic acid groups showed that H/D exchange was predictable and reproducible. Using accurate mass measurement and isotope peak intensities, the elemental composition of an unknown captured on filter paper was identified as dipropylene glycol (DPG) analyzed directly from the surface of the filter paper. Data from in-source CAD and H/D exchange of both the unknown and authentic standards confirmed that the unknown was DPG. The cross-correlation of accurate mass measurement and isotope peak intensities, in-source CAD and HID exchange data provided an unambiguous identification of the contaminant melamine in dog food without the need for any sample preparation. Once analytes are identified and confirmed, quantitation of the analyte is desirable. The calibration curves here are constructed using the net extracted ion-current associated with the analyte relative to the internal standard. In cough syrup, a complicated matrix, the linearity, R2, is shown to be 0.992.

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Zachreson, Matthew R. "Comparing Theory and Experiment for Analyte Transport in the First Vacuum Stage of the Inductively Coupled Plasma Mass Spectrometer". BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3538.

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The Direct Simulation Monte Carlo algorithm as coded in FENIX is used to model the transport of trace ions in the first vacuum stage of the inductively coupled plasma mass spectrometer. Haibin Ma of the Farnsworth group at Brigham Young University measured two radial trace density profiles: one 0.7 mm upstream of the sampling cone and the other 10 mm downstream. We compare simulation results from FENIX with the experimental results. We find that gas dynamic convection and diffusion are unable to account for the experimentally-measured profile changes from upstream to downstream. Including discharge quenching and ambipolar electric fields, however, makes it possible to account for the way the profiles change.

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The inductively coupled plasma mass spectrometer (ICP-MS) has been used in laboratories for many years. The majority of the improvements to the instrument have been done empirically through trial and error. A few fluid models have been made, which have given a general description of the flow through the mass spectrometer interface. However, due to long mean free path effects and other factors, it is very difficult to simulate the flow details well enough to predict how changing the interface design will change the formation of the ion beam. Towards this end, Spencer et al. developed FENIX, a direct simulation Monte Carlo algorithm capable of modeling this transitional flow through the mass spectrometer interface, the transitional flow from disorganized plasma to focused ion beam. Their previous work describes how FENIX simulates the neutral ion flow. While understanding the argon flow is essential to understanding the ICP-MS, the true goal is to improve its analyte detection capabilities. In this work, we develop a model for adding analyte to FENIX and compare it to previously collected experimental data. We also calculate how much ambipolar fields, plasma sheaths, and electron-ion recombination affect the ion beam formation. We find that behind the sampling interface there is no evidence of turbulent mixing. The behavior of the analyte seems to be described simply by convection and diffusion. Also, ambipolar field effects are small and do not significantly affect ion beam formation between the sampler and skimmer cones. We also find that the plasma sheath that forms around the sampling cone does not significantly affect the analyte flow downstream from the skimmer. However, it does thermally insulate the electrons from the sampling cone, which reduces ion-electron recombination. We also develop a model for electron-ion recombination. By comparing it to experimental data, we find that significant amounts of electron-ion recombination occurs just downstream from the sampling interface.

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Più fonti

Libri sul tema "Chromtography coupled to a mass spectrometer"

Ellam, Rob. 6. Measuring isotopes. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198723622.003.0006.

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Mass spectrometers have become routine laboratory instruments in many disciplines. ‘Measuring isotopes: mass spectrometers’ concentrates on those used to quantify the abundance of different isotopes—gas source isotope ratio, thermal ionization, inductively coupled plasma, and secondary ion mass spectrometers. A mass spectrometer can be used to quantify the concentration of a particular element by monitoring an isotope of that element not overlapped by isotopes of other elements. All mass spectrometers have three essential components: an ion source, a mass filter, and a detector. There are two main types of detector: Faraday detectors measure large signals and a variant of photomultiplier tubes measures small isotope signals.

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Capitoli di libri sul tema "Chromtography coupled to a mass spectrometer"

Sylvester, Paul. "Laser Ablation Inductively Coupled Mass Spectrometer (LA ICP-MS)". In Encyclopedia of Scientific Dating Methods, 1–2. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_75-1.

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Sylvester, Paul. "Laser Ablation Inductively Coupled Mass Spectrometer (LA ICP-MS)". In Encyclopedia of Scientific Dating Methods, 371–72. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_75.

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Moseley, M. A. "Coaxial Nanospray Coupled with a Hybrid Quadrupole/Time-of-Flight Tandem Mass Spectrometer for Proteome Studies". In Mass Spectrometry in Biology & Medicine, 179–98. Totowa, NJ: Humana Press, 2000. http://dx.doi.org/10.1007/978-1-59259-719-2_11.

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Pfahler, V., J. Adu-Gyamfi, D. O’Connell e F. Tamburini. "Purification Protocol". In Oxygen Isotopes of Inorganic Phosphate in Environmental Samples, 33–44. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97497-8_3.

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AbstractThe five stepwise purification of extracts and final precipitation of silver phosphate (A1–A5) are described. The first two steps (A1 and A2) are removing organic matter and are concentrating the phosphate in the extract by reducing the volume. Certain cations could interfere with the precipitation of silver phosphate and are removed in step A3. Silver chloride, which, if not removed, could co-precipitate with silver phosphate, is removed in step A4. The final analyte is then precipitated in step A5. The filtration steps can be quite tedious, using vacuum filtration equipment is therefore recommended. Following step A5, the silver phosphate samples need to be weighed in for the measurement with a thermal conversion elemental analyser (TC/EA) coupled to a continuous-flow isotope-ratio mass spectrometer (IRMS).

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Meyer, Armin H., Michael P. Maier e Martin Elsner. "Protocol to Investigate Volatile Aromatic Hydrocarbon Degradation with Purge and Trap Coupled to a Gas Chromatograph/Isotope Ratio Mass Spectrometer". In Springer Protocols Handbooks, 259–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/8623_2015_174.

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Weidenmüller, M., S. A. Elisseev, W. R. Plass, U. Czok, M. Winkler, H. Wollnik, H. Geissel et al. "Study of Cooling and Storage Properties of a Gas-Filled Linear Paul Trap Coupled to a Time-of-Flight Mass Spectrometer for Mass Measurements of Exotic Nuclei". In Atomic Physics at Accelerators: Stored Particles and Fundamental Physics, 219–24. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-0946-1_35.

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Najdekr, Lukáš, Giovanny Rodriguez Blanco e Warwick B. Dunn. "Collection of Untargeted Metabolomic Data for Mammalian Urine Applying HILIC and Reversed Phase Ultra Performance Liquid Chromatography Methods Coupled to a Q Exactive Mass Spectrometer". In Methods in Molecular Biology, 1–15. New York, NY: Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9488-5_1.

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Qu, Ying, Loren Olson, Xiaohui Jiang, Leah Aluisio, Christopher King, Elliott B. e Timothy W. "Evaluating PK/PD Relationship of CNS Drug by Using Liquid Chromtography/ Tandem Mass Spectrometry Coupled to In Vivo Microdialysis". In Tandem Mass Spectrometry - Applications and Principles. InTech, 2012. http://dx.doi.org/10.5772/33100.

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McCullagh, James, e Neil Oldham. "Separation techniques and quantification". In Mass Spectrometry. Oxford University Press, 2019. http://dx.doi.org/10.1093/hesc/9780198789048.003.0007.

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This chapter addresses the basic principles of analyte separation in the context of mass spectrometry (MS), which include separations that occur inside the mass spectrometer before the mass analyzer and those that take place prior to ionization using interfaced techniques. It discusses how combined separation and detection systems are connected, and how the analysis is combined to provide additional chemical and quantitative information. It also focuses on chromatographic techniques and its direct relevance to MS performance. The chapter outlines the principles of quantitative analysis which use chromatography coupled to MS. It highlights the advantages and disadvantages of different types of chromatographic calibration.

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Kalita Deka, Anamika, Kushwaha Jashvant Kumar e Sunshri Basumatary. "Monitoring Strategies for Heavy Metals in Foods and Beverages: Limitations for Human Health Risks". In Heavy Metals - Recent Advances [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.110542.

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Foods and beverages with heavy metal contents, their Maximum Permissible Limits (MPL), Estimated Dietary Intake (EDI), Target Hazard Quotient (THQ) to study carcinogenic effects with other human health related matters and metal remediation’s are high priority issues for sustainable world-wide developments. Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES), Inductively Coupled Plasma-Mass Spectrometer (ICP-MS), Flame atomic absorption spectroscopy (FAAS), Total Reflection X-Ray Fluorescence (TRXF) Spectroscopy, Chemical Replacement Combined with Surface-Enhanced Laser-Induced Breakdown Spectroscopy (CR-SENLIBS), Electrochemical apt- sensors are some advanced monitoring tactics for heavy metal detection. Nanotechnology innovations, soil state-of art remediation are used now-a-days for removal of metals from foods and beverages. In addition to this, chelating ligands, plant phenolic have crucial applications in heavy metal removal from foods. Bio-absorbents like microbial cultures, fermentation wastes also play crucial role in heavy metal remediation from foods and beverages. In the present chapter various metal monitoring tactics are focused with advance metal remediation procedures associated with food and beverages. Limitations of various metals associated with human health risks are also summarized herein.

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Atti di convegni sul tema "Chromtography coupled to a mass spectrometer"

Fredeen, Kenneth J. "Applications of Laser Sampling Inductively Coupled Plasma Mass Spectrometry". In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/laca.1992.pd2.

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Laser sampling inductively coupled plasma mass spectrometry (LS-ICP-MS) is a increasingly popular technique for the direct determination of trace elements in solid materials. In this technique, a high-power pulsed laser is used to vaporize a portion of a solid specimen. The sample vapor is then swept into an ICP discharge, which ionizes the vapor before it is subsequently sampled by a mass spectrometer.

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Kueerova, Hana, Tatjana Dostalova e J. Prochazkova. "Inductively coupled plasma mass spectrometer with laser ablation metal ions release detection in the human mouth". In International Symposium on Biomedical Optics, a cura di Peter Rechmann, Daniel Fried e Thomas Hennig. SPIE, 2002. http://dx.doi.org/10.1117/12.469320.

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Langejuergen, J., P. Cochems e S. Zimmermann. "A Simple Atmospheric Pressure Ionization Source Coupled to a Timeof-Flight Mass Spectrometer for Breath Analysis". In 10. Dresdner Sensor-Symposium 2011. Forschungsgesellschaft für Messtechnik, Sensorik und Medizintechnik e.V. Dresden, 2011. http://dx.doi.org/10.5162/10dss2011/5.1.

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Usman, Abida. "Optimization of Lead (Pb) Isotopes Measurement Using Quadrupole-Inductively Coupled Plasma Mass Spectrometer (Q-ICP-MS)". In Proceedings of the 18th International Conference on Heavy Metals in the Environment. openjournals ugent, 2016. http://dx.doi.org/10.21825/ichmet.71210.

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Smith, B. L., F. P. M. Jjunju, S. Taylor, I. S. Young e S. Maher. "Development of a portable, low cost, plasma ionization source coupled to a mass spectrometer for surface analysis". In 2016 IEEE SENSORS. IEEE, 2016. http://dx.doi.org/10.1109/icsens.2016.7808673.

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Okada, Shusuke, Chol-Bum Kweon, John C. Stetter, David E. Foster, Martin M. Shafer, Charles G. Christensen, James J. Schauer, Alexandra M. Schmidt, Amy M. Silverberg e Deborah S. Gross. "Measurement of Trace Metal Composition in Diesel Engine Particulate and its Potential for Determining Oil Consumption: ICPMS (Inductively Coupled Plasma Mass Spectrometer) and ATOFMS (Aerosol Time of Flight Mass Spectrometer) Measurements". In SAE 2003 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-0076.

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Tate, Connor, David P. Fries, Micael Vignati e Kevin Francis. "Using Model-Free Reinforcement Learning Combined With Underwater Mass Spectrometer and Material Archiving Coupled to Lab Analysis for Autonomous Chemical Source Verifications". In OCEANS 2021: San Diego – Porto. IEEE, 2021. http://dx.doi.org/10.23919/oceans44145.2021.9706111.

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Iticescu, C., P. L. Georgescu, M. Calmuc, V. Calmuc e C. Topa. "CLIMATIC AND ANTHROPOGENIC INFLUENCES ON WATER QUALITY IN LAKE BRATES, ROMANIA". In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023v/3.2/s12.07.

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Lake Brates is located near Galati city, in the south-eastern part of Romania being one of the largest lakes in the country. Unfortunately, water quality has greatly decreased in recent years, both due to human actions and to climate change. The present paper aims at establishing the quality of the water in Lake Brates as resulted from the calculation of the water quality index (WQI) by the weighted arithmetic method. In order to calculate this index, several sampling campaigns were carried out in various points of the lake, followed by the measurement of relevant parameters: pH, conductivity, salinity, oxygen demand (DO), chemical oxygen demand (COD), biochemical oxygen consumption at 5 days (CBO5), NO2 -, NO3 -, N total, Cl-, SO4 2-, PPO4 3-, heavy metals (As3+, Cr3+, Cu2+, Ni2+, Zn2+). Both the individual variation of the monitored physicochemical parameters and the variation of the WQI were tracked. Moreover, a correlation of the WQI with the climatic conditions in the region (rainfall and thermal regime) was established. The determinations were made by applying the standardized methods in force in � situ and ex-situ and by using the following equipment: the UV-Vis-NIR Spectrophotometer, Thermo Scientific Vanquish Flex UHPLC system coupled with the Mass Spectrometer, Thermo Scientific Trace GC coupled with the Quadrupole Mass Spectrometer, the Total Reflection X-Ray Fluorescence (TXRF) Spectrometer and a portable multiparameter.

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Byrdwell, William, e Hari Kiran Kotapati. "Adventures in multiple dimensions of chromatography and mass spectrometry for lipidomic analysis". In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/athx8798.

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Two-dimensional liquid chromatography (2D-LC) is commercially available and has become increasingly common in laboratories across the world. Most 2D-LC systems that are coupled to mass spectrometry use one mass spectrometer attached to the outlet of the second dimension, and the first dimension is reconstructed by “stitching together” the signal from all of the modulation periods. This requires short, fast separations in the second dimension, and fast-scanning mass spectrometers, otherwise “under sampling” can occur. Quantification is problematic using the “blobs” in 2D-LC chromatograms. We have bypassed or eliminated many of the shortcomings or limitations in conventional systems by using multiple mass spectrometers distributed across two or three dimensions of chromatography. We have published results showing the use of split-flow 2D-LC with four mass spectrometers in LC1MS2 × LC1MS2 = LC2MS4 experiments that combined non-aqueous reversed-phase (NARP) HPLC with silver ion chromatography UHPLC for analysis of cis/trans isomers and regioisomers in seed oils, with classic quantification of fat-soluble vitamins (FSVs) and triacylglycerols (TAGs) using direct detection in the first dimension and isomer separation in the second dimension. We have further reported split-flow three-dimensional (3D) LC with four mass spectrometers in LC1MS2 × (LC1MS1 + LC1MS1) = LC3MS4 analysis of infant formula that combined classic quantification of FSVs in the first dimension and TAG quantification by lipidomic analysis in the second dimension. We innovated multi-cycle (a.k.a., “constructive wraparound”) chromatography in the second second dimension for improved separation compared to the conventional approach used in the first second dimension. These and other combinations of LCxMSy are described.

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Freis, D., P. D. Bottomley, J. P. Hiernaut, J. Y. Colle, J. Ejton e W. de Weerd. "Post Irradiation Examination of HTR Fuel at ITU Karlruhe". In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58329.

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In the last years considerable efforts have been made at the Institute for Transuranium Elements (ITU) in order to reestablish European knowledge and ability in safety testing of irradiated high temperature reactor (HTR) Fuel Elements. In the framework of the 6th European framework programme a cold finger apparatus (Ku¨FA) furnace, formerly installed at FZ-Ju¨lich (FzJ), has been installed in a hot cell at ITU [Freis 2008] in order to test fission product release under high temperature and non-oxidising conditions. Several analytical methods (e.g. Gamma-spectrometry, mass-spectrometry) have been applied in order to analyse different isotopes released during Ku¨FA tests. After the heating tests, examinations of the fuel elements were performed including scanning electron microscopy (SEM) and micro-hardness testing of coated particles. Individual coated particles were object of heating tests in a Knudsen cell with a coupled mass spectrometer measuring all released species. In order to cover more accident scenarios, a second furnace for oxidising-conditions (air- or water-ingress) was constructed and installed in a cold lab. Furthermore a disintegration apparatus, based on anodic oxidation, was constructed and fuel elements were dissolved obtaining thousands of individual coated particles for further examination. A fully automated irradiated microsphere gamma analyzer (IMGA) is under construction and will be used, in particular, to identify and sort out failed particles.

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Rapporti di organizzazioni sul tema "Chromtography coupled to a mass spectrometer"

Furuta, Naoki, Curtis A. Monnig, Pengyuan Yang e Gary M. Hieftje. Noise Characteristics of an Inductively Coupled Plasma-Mass Spectrometer. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1989. http://dx.doi.org/10.21236/ada205686.

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Watrous, Matthew, Anthony Appelhans, Robert Hague, John Olson e Tracy Houghton. Multi-Collector Inductively Coupled Plasma Mass Spectrometer – Operational Performance Report. Office of Scientific and Technical Information (OSTI), giugno 2013. http://dx.doi.org/10.2172/1120795.

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Stewart, J., e W. Christie. (Performance of an Inductively Coupled Plasma-mass Spectrometer Analyzer system). Office of Scientific and Technical Information (OSTI), novembre 1989. http://dx.doi.org/10.2172/5288093.

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Koppenaal, D. W., C. J. Barinaga e M. R. Smith. Performance of an ion trap inductively coupled plasma mass spectrometer. Office of Scientific and Technical Information (OSTI), gennaio 1994. http://dx.doi.org/10.2172/10129925.

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Wall, Andrew J., Rosemary C. Capo, Brian W. Stewart, Thai T. Phan, Jinesh C. Jain, Alexandra Hakala e George D. Guthrie. High-Throughput Method for Strontium Isotope Analysis by Multi-Collector-Inductively Coupled Plasma-Mass Spectrometer. Office of Scientific and Technical Information (OSTI), settembre 2016. http://dx.doi.org/10.2172/1361494.

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Hakala, Jacqueline Alexandra. High-Throughput Method for Strontium Isotope Analysis by Multi-Collector-Inductively Coupled Plasma-Mass Spectrometer. Office of Scientific and Technical Information (OSTI), novembre 2016. http://dx.doi.org/10.2172/1337543.

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CATLOW, S. A. EXAMINE THE USE OF INDUCTIVELY COUPLED PLASMA MASS SPECTROMETER FOR THE DETERMINATION OF PLUTONIUM ACTIVITY. Office of Scientific and Technical Information (OSTI), febbraio 2004. http://dx.doi.org/10.2172/821827.

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Park, C. J., e G. E. M. Hall. Electrothermal Vapourization As a Means of Sample Introduction Into An Inductively Coupled Plasma Mass Spectrometer: a Preliminary Report of a New Analytical Technique. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120691.

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Benn, D., R. Linnen e T. Martins. Evaluating white mica as an indicator mineral for lithium bearing pegmatites, Wekusko Lake pegmatite field, Manitoba, Canada. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328982.

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This project investigates the potential use of white micas as an indicator mineral within Li-bearing pegmatites and the potential of field portable techniques, such as Raman spectroscopy and Laser Induced Breakdown Spectroscopy (LIBS) as real-time techniques in exploration. The pegmatites in the Wekusko Lake field, Manitoba, Canada, display five zones of varying mineralization. White micas display two textures in the field (primary igneous and secondary) and four textures were identified by backscattered electron imaging (poor zonation, rimmed, patchy and exsolution). The white micas were analysed by Electron Probe Micro-Analysis (EPMA) and Laser Ablation Induction-Coupled Plasma Mass Spectroscopy (LA-ICP-MS) and the results show a strong correlation in the Li content of the white mica and the whole rock Li2O obtained from the assays of drill core. The K/Rb vs. Cs contents of the white mica indicate that the most prospective dikes contain moderate to highly evolved grains. The use of portable Raman Spectrometer, while useful for mineral identification, was not able to detect a significant Li signature at the concentrations tested (1500-6000 ppm).

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