Готові списки джерел за темами / Spectrophotometer analysi

Добірка наукової літератури з теми "Spectrophotometer analysi"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Spectrophotometer analysi"

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Shehata, Adel B., Abdulrahman R. Alaskar, Mohammed A. Alrasheed, Abdullah S. Alosaimi, Fahd A. Alkharraa, and Abdulrahman M. Alzahrani. "Certification of sodium benzoate solution reference material by HPLC-UV, LC-MS/MS and UV-VIS-NIR spectrophotometry for food and drug analysi." Journal of Chemical Metrology 14, no. 2 (November 28, 2020): 88–105. http://dx.doi.org/10.25135/jcm.48.20.08.1780.

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Sodium benzoate is one of the most widely used food perseverates and has to be used in regulated amounts to avoid its harmful health effects. Reviewing the scientific literature for traceability of the analytical measurement results of sodium benzoate in various food and drug applications to the SI units, it has been found that no scientific details of certification of sodium benzoate CRMs used for the calibration of measuring equipment are published. For this reason, the national metrology institute of Saudi Arabia (SASO/NMCC) certifies a sodium benzoate solution reference material. In this work, sodium benzoate was synthesized, purified and a batch solution reference material was prepared as 1014.47 mg/kg then homogenized and bottled. Homogeneity and stability of the candidate RM were assessed and the results obtained showed that the material is sufficiently homogeneous and stable. Characterization of the reference material was carried out by HPLC-UV, LC-MS/MS and UV-VIS-NIR spectrophotometer as three independent methods. The certified value was derived by combining data from the three methods using the weighted mean approach and was found 1016.13 mg/kg. The certified uncertainty was calculated as weighted uncertainty and was found 10.47 mg/kg (1.03%). Sources of this uncertainty were identified from the characterization, uchar, homogeneity, uhom, and long-term stability, ults, as well as the bias allowance, B.
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Mohammad, Karim Aly, Abdelhalim Zekry, and Mohamed Abouelatta. "LED Based Spectrophotometer can compete with conventional one." International Journal of Engineering & Technology 4, no. 2 (May 24, 2015): 399. http://dx.doi.org/10.14419/ijet.v4i2.4504.

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Spectrophotometers are the common devise used for blood analysis. These analyses are simply optioned from the transmittance of monochromatic light through a blood sample. It disperses their light sources by different techniques; the simplest one is the use of interference filters in front of broad-band light source. As Interference bandpass filters are relatively inexpensive wavelength selectors. Interference filters that allow transmission of a predetermined wavelength while rejecting or blocking other wavelengths are widely used in instrumentation for clinical chemistry. On the other hand, the lights emitting diodes (LEDs) emits a specified band and have a wide selection options. An economic device based on LEDs (LED based spectrometer) is explained in this work. Instead of the wide spectrum light source and filters (commercial spectrophotometer), The LED based spectrophotometer is calibrated with standard solutions, and its measurement results is compared with the Mindray BS-200 Chemistry Analyzer (commercial spectrophotometer). The comparison shows acceptable results between both spectrophotometers with maximum error 2.33%. The errors can be reduced by applying more fining alignment. Another benefit of the new designee is to minimize testing costs.
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Dhawale, Nandkishor M., Viacheslav I. Adamchuk, Shiv O. Prasher, Raphael A. Viscarra Rossel, and Ashraf A. Ismail. "Evaluation of Two Portable Hyperspectral-Sensor-Based Instruments to Predict Key Soil Properties in Canadian Soils." Sensors 22, no. 7 (March 26, 2022): 2556. http://dx.doi.org/10.3390/s22072556.

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In contrast with classic bench-top hyperspectral (multispectral)-sensor-based instruments (spectrophotometers), the portable ones are rugged, relatively inexpensive, and simple to use; therefore, they are suitable for field implementation to more closely examine various soil properties on the spot. The purpose of this study was to evaluate two portable spectrophotometers to predict key soil properties such as texture and soil organic carbon (SOC) in 282 soil samples collected from proportional fields in four Canadian provinces. Of the two instruments, one was the first of its kind (prototype) and was a mid-infrared (mid-IR) spectrophotometer operating between ~5500 and ~11,000 nm. The other instrument was a readily available dual-type spectrophotometer having a spectral range in both visible (vis) and near-infrared (NIR) regions with wavelengths ranging between ~400 and ~2220 nm. A large number of soil samples (n = 282) were used to represent a wide variety of soil textures, from clay loam to sandy soils, with a considerable range of SOC. These samples were subjected to routine laboratory soil analysis before both spectrophotometers were used to collect diffuse reflectance spectroscopy (DRS) measurements. After data collection, the mid-IR and vis-NIR spectra were randomly divided into calibration (70%) and validation (30%) sets. Partial least squares regression (PLSR) was used with leave one out cross-validation techniques to derive the spectral calibrations to predict SOC, sand, and clay content. The performances of the calibration models were reevaluated on the validation set. It was found that sand content can be predicted more accurately using the portable mid-IR spectrophotometer and clay content is better predicted using the readily available dual-type vis-NIR spectrophotometer. The coefficients of determination (R2) and root mean squared error (RMSE) were determined to be most favorable for clay (0.82 and 78 g kg−1) and sand (0.82 and 103 g kg−1), respectively. The ability to predict SOC content precisely was not particularly good for the dataset of soils used in this study with an R2 and RMSE of 0.54 and 4.1 g kg−1. The tested method demonstrated that both portable mid-IR and vis-NIR spectrophotometers were comparable in predicting soil texture on a large soil dataset collected from agricultural fields in four Canadian provinces.
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Morawski, Roman Z. "Measurement Data Processing in Spectrophotometric Analysers of Food." Metrology and Measurement Systems 19, no. 4 (December 1, 2012): 623–52. http://dx.doi.org/10.2478/v10178-012-0056-1.

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Abstract Spectrometry, especially spectrophotometry, is getting more and more often the method of choice not only in laboratory analysis of (bio)chemical substances, but also in the off-laboratory identification and testing of physical properties of various products, in particular - of various organic mixtures including food products and ingredients. Specialised spectrophotometers, called spectrophotometric analysers, are designed for such applications. This paper is on the state of the art in the domain of data processing in spectrophotometric analysers of food (including beverages). The following issues are covered: methodological background of food analysis, physical and metrological principles of spectrophotometry, the role of measurement data processing in spectrophotometry. General considerations are illustrated with examples, predominantly related to wine and olive oil analysis.
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Kholifa, Mulik, Tri Mulyono, and Yeni Maulidah Muflihah. "Simultaneous Determination of Magnesium (Mg2+) and Ammonium (NH4+) by Flow Injection Analysis." Jurnal ILMU DASAR 19, no. 1 (February 28, 2018): 1. http://dx.doi.org/10.19184/jid.v19i1.5483.

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An automatic method for the simultaneous determination of magnesium and ammoniun by flow injection analysis is described. This analysis used two detectors, potentiometry and spectrophotometry, for the determination of magnesium and ammonium simultaneously. Potentiometric detectors are used to detect ammonium ions, whereas spectrophotometer detectors are used to detect the presence of magnesium ions. The performance of the FIA system includes linear range linearity, limit of detection, sensitivity, reproducibility and recovery test. Spectrophotometry FIA showed good performance with several criteria of linearity with regression value of 0.9918, the detection limit of 0.06 ppm, a sensitivity of 0.0115, repeatability of less than 2% and the percent recovery of 91,6%. While potentiometric FIA showed th performance with several criteria of linearity with regression value of 0.9896, the detection limit of 0.17 ppm, a sensitivity of 40.747 mV per decade of concentration, repeatability of less than 2% and the percent recovery of 89,7%. Keywords: Flow Injection Analysis, spectrophotometry, potensiometry, simultaneous
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Mouazen, A. M., W. Saeys, J. Xing, J. De Baerdemaeker, and H. Ramon. "Near Infrared Spectroscopy for Agricultural Materials: An Instrument Comparison." Journal of Near Infrared Spectroscopy 13, no. 2 (April 2005): 87–97. http://dx.doi.org/10.1255/jnirs.461.

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The selection of a spectrophotometer for the measurement of constituents of agricultural materials with acceptable accuracy and cost effectiveness requires a comparative study of the performance of different spectrophotometers. Four commercially available spectrophotometers were evaluated, based on measurements performed on three agricultural materials. These spectrophotometers, differing mainly in wavelength range and measurement principles, comprised a diode array (DA) of 300–1700 nm, a combination of diode array and scanning monochromator (DASM) of 350–2500 nm, a Fourier transform (FT) of 750–2500 nm and a scanning monochromator (SM) of 400–2500 nm spectrophotometers. They were used to measure the moisture content of soil, the chemical constituents of hog manure and to detect bruising in apples. Three spectral pre-treatments were considered. Calibrations were developed using partial least squares (PLS) regression with the leave-one-out cross-validation technique for soil and manure and principal component analysis (PCA) for apple. The four instruments provided good predictions for soil moisture content, with the largest coefficient of determination ( r2) values between 0.84–0.86 and with the largest ratio of prediction to deviation ( RPD) of standard deviation ( SD) to root mean square error of cross-validation ( RMSECV) ranging from 2.53 to 2.75. The DASM and SM were comparable and slightly better than the DA and FT. For hog manure, total nitrogen was predicted more accurately with the four instruments ( r2 = 0.83–0.89 and RPD = 2.43–3.01) than the phosphorus ( r2 = 0.66–0.85 and RPD = 1.72–2.61) and potassium ( r2 = 0.70–0.84 and RPD = 1.83–2.50). The order of accuracy of the four spectrophotometers for the measurement of total nitrogen was: FT–SM–DA–DASM. For phosphorus and potassium the order was: DA–DASM–FT–SM and SM–FT–DASM–DA, respectively. The DA performed better than the DASM and FT for discrimination of bi-colour and single-colour bruised apple, respectively. Therefore, selection of a spectrophotometer depends mainly on the type of material analysed and the constituent to be measured. Wavelengths above 1700 nm were found unnecessary for the applications considered and the DA spectrophotometer was of sufficient accuracy, as it is robust, significantly cheaper and can be used in the field for on-line measurements.
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Saputro, Sulistyo, Ashadi Ashadi, Lina Mahardiani, Nurma Yunita Indriyanti, Maria Ciptaning Sabdo Kawedhar, and Wima Pudya Ajunda. "The Analysis of Low-Cost Pb(II) Adsorbents using Batch Method of Solid-Phase Spectrophotometry." Jurnal Kimia Valensi 7, no. 1 (June 21, 2021): 38–45. http://dx.doi.org/10.15408/jkv.v7i1.18363.

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Heavy metal pollutants contained in wastewater can cause health problems for living things around. Minor to fatal health problems can occur due to heavy metal poisoning, mainly caused by Pb(II) metal.. This study aimed to determine the optimum mass combination of rice husk and zeolite to adsorb Pb(II) metal ions in simulated wastewater, and to determine the sensitivity of the analysis method. This study used Solid Phase Spectrophotometry (SPS) to determine the decrease in Pb(II) metal ion levels after being adsorbed by activated carbon from rice husks and zeolites. This study used an experimental method with simulated wastewater samples containing Pb(II) at several concentrations. Pb(II) adsorption processes by rice husk and natural zeolite used various adsorbents' mass ratios. The adsorbents were characterized by using Fourier-Transform Infra-Red (FTIR) Spectrophotometry. Pb(II) analysis during adsorption processes used a single beam UV-visible Spectrophotometer for Solid-Phase Spectrophotometry. This study indicates that the combination of adsorbent from rice husk and natural zeolite can properly adsorb Pb(II) ions with an adsorption capacity of 0.75 μg g-1 and 0.025 μg L-1 for the LoD of the instrument.
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Saputro, Sulistyo, Ashadi Ashadi, Lina Mahardiani, Nurma Yunita Indriyanti, Maria Ciptaning Sabdo Kawedhar, and Wima Pudya Ajunda. "The Analysis of Low-Cost Pb(II) Adsorbents using Batch Method of Solid-Phase Spectrophotometry." Jurnal Kimia Valensi 1, no. 1 (June 21, 2021): 38–45. http://dx.doi.org/10.15408/jkv.v1i1.18363.

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Heavy metal pollutants contained in wastewater can cause health problems for living things around. Minor to fatal health problems can occur due to heavy metal poisoning, mainly caused by Pb(II) metal.. This study aimed to determine the optimum mass combination of rice husk and zeolite to adsorb Pb(II) metal ions in simulated wastewater, and to determine the sensitivity of the analysis method. This study used Solid Phase Spectrophotometry (SPS) to determine the decrease in Pb(II) metal ion levels after being adsorbed by activated carbon from rice husks and zeolites. This study used an experimental method with simulated wastewater samples containing Pb(II) at several concentrations. Pb(II) adsorption processes by rice husk and natural zeolite used various adsorbents' mass ratios. The adsorbents were characterized by using Fourier-Transform Infra-Red (FTIR) Spectrophotometry. Pb(II) analysis during adsorption processes used a single beam UV-visible Spectrophotometer for Solid-Phase Spectrophotometry. This study indicates that the combination of adsorbent from rice husk and natural zeolite can properly adsorb Pb(II) ions with an adsorption capacity of 0.75 μg g-1 and 0.025 μg L-1 for the LoD of the instrument.
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Darmawati, Darmawati, Syaiful Bahri, and Husain Sosidi. "Analisis Kadar Glukomanan Dari Biji Durian (Durio zeibethinus Murr) dengan Metode Spektrofotometri pada Berbagai Waktu dan Suhu Hidrolisis." KOVALEN: Jurnal Riset Kimia 6, no. 2 (September 1, 2020): 158–64. http://dx.doi.org/10.22487/kovalen.2020.v6.i2.11582.

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Durian seeds are one type of seed that contains glucomannan. The aim is to determine glucomannan levels in the durian seed. The study was designed using a completely randomized design (CRD). The extracted glucomannan was determined by the spectrophotometry method at various temperature and hydrolysis time. The crude extract of glucomannan was hydrolyzed using 3 M HCl for 70, 80, 90, 100, and 110 minutes at 70, 80, 90, 100, and 110°C. The highest glucomannan concentration of 39.60% was obtained at a hydrolysis temperature of 100°C for 100 minutes. The analysis of the FTIR spectrophotometer shown that the vibration of the C-O-C functional group (glycoside bond) was obtained at the wavelength number of 1020.34 cm-1 which is a characteristic of glucomannan. Keywords: glucomannan, durian seed, hydrolysis, spectrophotometry
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Brescia, P. "Multi-Volume Analysis of Nucleic Acids Using the EPOCH™ Spectrophotometer System." Nauka ta innovacii 8, no. 2 (March 30, 2012): 43–47. http://dx.doi.org/10.15407/scin8.02.043.

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Дисертації з теми "Spectrophotometer analysi"

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Wheatley, Robert Alan. "Aldehydic lipid peroxidation products : flow analysis using spectrophotometry and chemiluminescence." Thesis, University of Hull, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363331.

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Wolf, Katharine. "Flow injection analysis with photodiode array detection." Thesis, University of Hull, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278427.

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Sooväli, Lilli. "Spectrophotometric measurements and their uncertainty in chemical analysis and dissociation constant measurements /." Online version, 2006. http://dspace.utlib.ee/dspace/bitstream/10062/627/5/soovalililli.pdf.

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4

De, Bock Veerle. "Analysis and interpretation of Aerosol Optical Depth values retrieved from a Brewer spectrophotometer at Uccle, Belgium." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/277633.

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Aerosols are particles in the solid or liquid phase that are suspended in the atmosphere. They have an important influence on the atmospheric chemistry and physics, affect the tropospheric chemical composition, can reduce visibility and have important impacts on human health. Aerosols also influence the Earth’s radiation budget. Although a lot of research has been done to investigate the influence of aerosols on the climate, they remain key contributors to the uncertainties in current climate studies due to the lack of information concerning their temporal and spatial distribution. One of the parameters that is of importance to understand the influence of aerosols is the aerosol optical depth (AOD), an integral measurement of the combined aerosol scattering and absorption in the atmospheric column. The first part of this PhD describes an adapted and improved method for the retrieval of AOD values using sun scan measurements from a Brewer spectrophotometer at 340 nm at Uccle. The retrieved AOD values are subjected to a cloud screening technique and are compared to quasi simultaneous, collocated CIMEL AOD values. The good agreement between both instruments highlights that the Brewer is largely sensitive to AOD at 340 nm and it justifies its use in sun scan mode to expand the AOD retrieval network of instruments. The monthly and seasonal behavior of the retrieved AOD values is also studied in this work and our results agree with results found in literature.Another point of concern in scientific communities is the known adverse effect of UV radiation on human health, the biosphere and atmospheric chemistry. Apart from its obvious relation with global solar radiation and ozone, the amount of UV radiation that reaches the surface of the Earth also depends on the characteristics and quantity of aerosols in the atmosphere and accuracy in UV prediction can be improved if the influence of aerosols on surface UV radiation is clarified. For this reason, the second part of this work focuses on the relation between the erythemal UV dose, global solar radiation, total ozone column and AOD (at 320 nm) at Uccle. Simultaneous measurements of these variables are available for a time period of 25 years (1991–2015) and this time series is long enough to allow for reliable determination of significant changes. Different analysis techniques (linear trend analysis, change point analysis and multiple linear regression) are combined to allow for an extensive study of the relations between the variables.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
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5

Rakbamrung, Nawasit. "Determination of some inorganic ions, with or without preconcentration, by flow injection analysis or ion chromatography." Thesis, Liverpool John Moores University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288214.

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Dowds, Eileen. "Automated Data Acquisition for Analysis of Fly Ash by Graphite Furnace Atomic Absorption Spectrophotometry." W&M ScholarWorks, 1989. https://scholarworks.wm.edu/etd/1539625520.

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Phiri, Mohau Justice. "On-line monitoring of base metals solutions in flotation using diffuse reflectance spectrophotometry." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5173.

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Thesis (MScEng (Process Engineering))--University of Stellenbosch, 2010.
Thesis submitted in partial fulfilment of the requirements for the degree of MASTER OF SCIENCE IN ENGINEERING (MINERAL PROCESSING) in the Department of Processing Engineering at the University of Stellenbosch
ENGLISH ABSTRACT: This work evaluates the use of inverse least squares (ILS) and classical least squares (CLS) models for calibration of a diffuse reflectance spectrophotometer for on-line monitoring of the aqueous phase in a flotation cells. Both models use a Beer's law for the quantification of the metals. The formulated statistical models are compared to a proprietary Blue Cube model in terms of prediction ability to determine the potential applicability of the models. A diffuse reflectance spectrophotometry was used for simultaneous analysis of copper (Cu), cobalt (Co) and zinc (Zn) in the solutions. The laboratory set-up of Blue Cube instrument was used for the experimental analysis. The concentrations and matrix compositions of the samples are simulated according to Skorpion zinc mine plant conditions. The calibration samples were prepared using a simplex-centroid mixture design with the triplicates of the centroid run. The unknown or test samples were prepared randomly within the same concentration of the calibration samples. The effects of temperature and nickel concentration on absorption of the metals were evaluated in the following range, 20 - 80 °C and 125 - 400 ppm, respectively. The statistical models (ILS and CLS) were calibrated from visible and near infrared (VNIR) spectra data of the calibration samples. A modified Beer's method was used as a preprocessing technique to convert the raw data into absorbance values. The manual wavelength selection procedure was used to select the wavelengths to be used in both models. The quality of the models was evaluated based on Rª and % root mean squared error (RMSE) values with 0.90 and 10% used as the guideline for the respective statistical parameters. Both ILS and CLS models showed good results for all three metals (Cu, Co and Zn) during their calibration steps. It was further shown that both models give worse predictions for Zn as compared to other metals due to its low relative intensity in the mixture. The derivative orders of absorbance spectra that were used to enhance the prediction results of Zn had no positive effect but they rather lowered accuracy of predictions. An increase in temperature was found to increase the intensities of the absorption spectra of all the metals while an increase in nickel concentration decreases the prediction ability of model. The developed statistical models were compared to a Blue Cube model in terms of prediction ability using analysis of variance (ANOVA) test. The ANOVA results revealed that there is no statistical difference between the developed models and Blue Cube model since the F-values for all the metals were below the critical F-value. Furthermore, the partial least squares (PLS) model shows an increased accuracy results for prediction of zinc metal as compared to both the ILS and CLS models. Finally, good comparisons of the statistical models results with atomic absorption spectroscopy (AAS) analyses were establish for the unknown samples. The study demonstrates that chemometric models (ILS and CLS) developed here can be used for quantification of several metals in real hydrometallurgical solutions as samples were simulated according to a plant conditions. However, in order to have confidence in the results of the models, a factorial-mixture design must be used to study the effect of temperature and nickel concentration. Moreover the models must be further tested and validated on the real samples from a plant.
AFRIKAANSE OPSOMMING: Hierdie werkstuk evalueer die gebruik van inverse kleinste kwadraatmetodes (IKK) en klassieke kleinste kwadraatmetodes (KKK) vir die kalibrasie van 'n diffuse reflektansiespektrofotometer vir die aanlyn monitering van die waterige fase in flottasieselle. Beer se wet word vir die kwantifisering van metale vir albei modelle gebruik. Die omskrewe data-gebaseerde modelle is op grond van voorspellingsvermoë vergelyk met'n. Blue Cube model, sodat die moontlike toepaslikheid van hierdie modelle bepaal kan word. 'n Diffuse reflectantie spektrofotometrie is ingespan vir die gelyktydige analise van koper (Cu), kobalt (Co) en sink (Zn) in oplossing. Eksperimentele analises is met behulp van 'n laboratoriumopstelling met 'n Blue Cube instrument uitgevoer. Die konsentrasies en matriks-samestellings van monsters is gesimuleer om Skorpion sinkmyn aanlegkondisies na te boots. Kalibrasie monsters is voorberei volgens . simpleks-sentroïed mengselontwerp met drievoudige sentroïede lopies. Onbekende (toets) monsters is ewekansig voorberei binne dieselfde konsentrasie spesifikasies as die kalibrasie monsters. Die invloed van temperatuur en nikkelkonsenstrasie op die absorpsie van die metale is in die bestek van 20 - 80 °C en 125 - 400 dpm, onderskeidelik, bepaal. Die data-gebaseerde modelle (IKK en KKK) is met sigbare en naby infrarooi (SNIR) spektra data van die kalibrasie monsters gekalibreer. 'n Gewysigde Beer metode is vir data voorbereiding benut om rou data na absorbansie waardes om te skakel. Die handgolflengte-seleksieprosedure is vir beide modelle gebruik om die golflengtes te kies. Die kwaliteit van die modelle is op grond van Rª en % wortel gemiddelde kwadratiese fout (WGKF) geevalueer, met waardes van 0.90 en 10% (onderskeidelik) as riglyne vir hierdie statistiese parameters. Beide IKK en KKK modelle het vir hul kalibrasie stappe vir al drie metale (Cu, Co en Zn) goeie resultate getoon. Dit is verder getoon dat albei modelle die slegste voorspellings lewer vir Zn (vergeleke met die ander metale) as gevolg van Zn se lae relatiewe intensiteit in die mengsel. Afgeleide ordes van absorbansie spektra is gebruik om die Zn voorspellings te versterk, maar het geen positiewe effek gehad nie; inteendeel, voorspellingakkuraatheid is verlaag. ʼn Verhoging in temperatuur het die intensiteite van die absorpsie spektra van alle metale verhoog, terwyl ʼn verhoging in nikkelkonsentrasie die voorspellingakkuraatheid van die modelle verlaag het. Die ontwikkelde data-gebaseerde modelle is met ʼn Blue Cube model vergelyk in terme van voorspellingsvermoë met behulp van variansie-analise (ANOVA). Die ANOVA resultate toon dat daar geen statistiese verskil tussen die ontwikkelde modelle en die Blue Cube model is nie, aangesien die F-waardes vir al die metale onder die kritiese F-waarde is. Die gedeeltelike kleinste kwadraatmodel (GKK) toon verder verhoogde voorspellingakkuraat-heid vir sinkmetaal tenoor beide die IKK en KKK modelle. Ten slotte, goeie ooreenstemming van die data-gebaseerde modelresultate met atoomabsorpsie spektroskopie (AAS) analise is vir die onbekende monsters gevind. Hierdie werkstuk toon dat die chemometriese modelle (IKK en KKK) wat hier ontwikkel is, gebruik kan word vir die kwantifisering van verskeie metale in werklike hidrometallurgiese oplossings, aangesien monsters gesimuleer is volgens aanlegkondisies. Om egter verdere vertroue te hê in die modelresultate, sal ʼn faktoriaal-mengselontwerp toegepas moet word om die effek van temperatuur en nikkelkonsentrasie te ondersoek. Voorts moet die modelle verder getoets en gevalideer word op werklike monsters van ʼn aanleg.
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Nilsson, Karolina. "Spectrophotometric measurement automatization for the analysis of enzymatic processes." Thesis, Uppsala University, Signals and Systems Group, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-125723.

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This thesis work consisted of the development of a virtual instrument that automates enzyme activity measurements and spectrum measurements with the spectrophotometer UVmini-1240. The purpose was to expand the functionality of the instrument, to eliminate the human error and to decrease the amount of time spent on measurements. A PC was connected to the UVmini-1240 via a RS-232C interface and the cell position and temperature was regulated with a CPS-240A controller. The new interface allows all the parameters to be set in the same place. It allows a visualization of the continuous monitoring of the sample absorbance and the option to save the data for post-processing. Also a module for measuring the spectrum of a sample in the wavelength range of 190 nm to 1100 nm is included. The graphical programming language LabView was used to develop the virtual instrument. This thesis work also contained measurement series of the catalase enzyme activity. These were carried out to determine the best storage temperature for the catalase solution and to determine the optimal surrounding temperature for the highest activity in the catalase solution. The conclusions were that the activity does not change considerably the first week of storage, not matter the temperature, and that the activity goes down when the surrounding temperature reaches above 30° C. These measurements were part of a bigger project to develop an ultrasonic method for measuring enzyme activity at the Institute of Acoustics at C.S.I.C in Madrid.

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9

Elkhazin, Mohamed M. A. "Analysis of coronal discoloration from commonly used obturation materials." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8814_1256029448.

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The objective of this study was to assess coronal discoloration due to four commonly used endodontic sealers with gutta-percha, using spectrophotometric analysis. Extracted human teeth were obturated with the experimental sealers and GP. The sealers that were tested included AH Plus, EndoRez, and Kerr Pulp Canal Sealer. The teeth were maintained in a moist environment at 37 C. Immediate pretreatment readings of the crowns of the extracted teeth with a spectrometer were used as baseline data. Subsequent readings were taken every two weeks for two months. Results were analysed using Wilcoxson Signed Rank sum test and Kruskal Wallis test.

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10

Avramidis, Stefanos. "Simulation and parameter estimation of spectrophotometric instruments ." Thesis, KTH, Numerical Analysis and Computer Science, NADA, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12292.

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The paper and the graphics industries use two instruments with different optical geometry (d/0 and 45/0) to measure the quality of paper prints. The instruments have been reported to yield incompatible measurements and even rank samples differently in some cases, causing communication problems between these sectors of industry.A preliminary investigation concluded that the inter-instrument difference could be significantly influenced by external factors (background, calibration, heterogeneity of the medium). A simple methodology for eliminating these external factors and thereby minimizing the instrument differences has been derived. The measurements showed that, when the external factors are eliminated, and there is no fluorescence or gloss influence, the inter-instrument difference becomes small, depends on the instrument geometry, and varies systematically with the scattering, absorption, and transmittance properties of the sample.A detailed description of the impact of the geometry on the results has been presented regarding a large sample range. Simulations with the radiative transfer model DORT2002 showed that the instruments measurements follow the physical radiative transfer model except in cases of samples with extreme properties. The conclusion is that the physical explanation of the geometrical inter-instrument differences is based on the different degree of light permeation from the two geometries, which eventually results in a different degree of influence from near-surface bulk scattering. It was also shown that the d/0 instrument fulfils the assumptions of a diffuse field of reflected light from the medium only for samples that resemble the perfect diffuser but it yields an anisotropic field of reflected light when there is significant absorption or transmittance. In the latter case, the 45/0 proves to be less anisotropic than the d/0.In the process, the computational performance of the DORT2002 has been significantly improved. After the modification of the DORT2002 in order to include the 45/0 geometry, the Gauss-Newton optimization algorithm for the solution of the inverse problem was qualified as the most appropriate one, after testing different optimization methods for performance, stability and accuracy. Finally, a new homotopic initial-value algorithm for routine tasks (spectral calculations) was introduced, which resulted in a further three-fold speedup of the whole algorithm.The paper and the graphics industries use two instruments with different optical geometry (d/0 and 45/0) to measure the quality of paper prints. The instruments have been reported to yield incompatible measurements and even rank samples differently in some cases, causing communication problems between these sectors of industry.A preliminary investigation concluded that the inter-instrument difference could be significantly influenced by external factors (background, calibration, heterogeneity of the medium). A simple methodology for eliminating these external factors and thereby minimizing the instrument differences has been derived. The measurements showed that, when the external factors are eliminated, and there is no fluorescence or gloss influence, the inter-instrument difference becomes small, depends on the instrument geometry, and varies systematically with the scattering, absorption, and transmittance properties of the sample.A detailed description of the impact of the geometry on the results has been presented regarding a large sample range. Simulations with the radiative transfer model DORT2002 showed that the instruments measurements follow the physical radiative transfer model except in cases of samples with extreme properties. The conclusion is that the physical explanation of the geometrical inter-instrument differences is based on the different degree of light permeation from the two geometries, which eventually results in a different degree of influence from near-surface bulk scattering. It was also shown that the d/0 instrument fulfils the assumptions of a diffuse field of reflected light from the medium only for samples that resemble the perfect diffuser but it yields an anisotropic field of reflected light when there is significant absorption or transmittance. In the latter case, the 45/0 proves to be less anisotropic than the d/0.In the process, the computational performance of the DORT2002 has been significantly improved. After the modification of the DORT2002 in order to include the 45/0 geometry, the Gauss-Newton optimization algorithm for the solution of the inverse problem was qualified as the most appropriate one, after testing different optimization methods for performance, stability and accuracy. Finally, a new homotopic initial-value algorithm for routine tasks (spectral calculations) was introduced, which resulted in a further three-fold speedup of the whole algorithm.


QC 20100707
PaperOpt, Paper Optics and Colour
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Книги з теми "Spectrophotometer analysi"

1

Němcová, Irena. Spectrophotometric reactions. New York: Marcel Dekker, 1996.

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2

S, Görög. Ultraviolet-visible spectrophotometry in pharmaceutical analysis. Boca Raton, Fla: CRC Press, 1995.

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3

Marczenko, Zygmunt. Separation, preconcentration, and spectrophotometry in inorganic analysis. Amsterdam: Elsevier Science B.V., 2000.

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4

Olivier, Thomas, and Burgess C, eds. UV-visible spectrophotometry of water and wastewater. Amsterdam: Elsevier, 2007.

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5

G, Watson David. Pharmaceutical analysis: A textbook for pharmacy students and pharmaceutical chemists. Edinburgh [Scotland]: Churchill Livingstone, 1999.

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6

Flotacyjno-spektrofotometryczne oznaczanie mikrogramowych ilości rutenu i osmu z użyciem barwników zasadowych. Warszawa: Wydawnictwa Politechniki Warszawskiej, 1991.

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7

1945-, Burgess C., Mielenz Klaus D, Ultraviolet Spectrometry Group, and Council for Optical Radiation Measurements., eds. Advances in standards and methodology in spectrophotometry: Papers presented at the first joint meeting of the UV Spectrometry Group of the UK and the Council for Optical Radiation Measurements of the USA, Oxford, September14-17, 1986. Amsterdam: Elsevier, 1987.

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8

C, Burgess, Mielenz K. D, Ultraviolet Spectrometry Group (Great Britain), and Council for Optical Radiation Measurements (U.S.), eds. Advances in standards and methodology in spectrophotometry: Papers presented at the first joint meeting of the UV Spectrometry Group of the U.K. and the Council for Optical Radiation Measurements of the U.S.A., Oxford, September 14-17, 1986. Amsterdam: Elsevier, 1987.

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9

Wilfredo, Morales, Lauer James L, and Lewis Research Center, eds. Analysis of a thioether lubricant by infrared fourier microemission spectrophotometery. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1986.

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10

S, Poluėktov N., and Fiziko-khimicheskiĭ institut im. A.V. Bogatskogo., eds. Spektrofotometricheskie i li͡u︡minest͡s︡entnye metody opredelenii͡a︡ lantanoidov. Kiev: Nauk. dumka, 1989.

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Частини книг з теми "Spectrophotometer analysi"

1

Bruno, Thomas J., and Paris D. N. Svoronos. "Infrared Spectrophotometry." In CRC Handbook of Basic Tables for Chemical Analysis, 363–463. Fourth edition. | Boca Raton, FL : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/b22281-9.

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2

Gordon, M. H., and R. Macrae. "UV—visible spectrophotometry." In Instrumental Analysis in the Biological Sciences, 92–116. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-1521-6_6.

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3

Amekura, Hiro. "Ultraviolet–Visible Spectrophotometry." In Compendium of Surface and Interface Analysis, 791–99. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6156-1_126.

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4

Loconto, Paul R. "Introduction to the Visible Spectrophotometer." In Laboratory Experiments in Trace Environmental Quantitative Analysis, 17–24. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003260707-3.

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5

Gordon, M. H., and R. Macrae. "Fluorescence and phosphorescence spectrophotometry." In Instrumental Analysis in the Biological Sciences, 117–32. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-1521-6_7.

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6

Brzović, Peter S., and Michael F. Dunn. "Rapid-Scanning Stopped-Flow Spectrophotometry." In Methods of Biochemical Analysis, 191–273. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/9780470110584.ch5.

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7

Bruno, Thomas J., and Paris D. N. Svoronos. "Ultraviolet and Visible Spectrophotometry." In CRC Handbook of Basic Tables for Chemical Analysis, 321–62. Fourth edition. | Boca Raton, FL : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/b22281-8.

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8

Vangsness, C. Thomas. "Laser Meniscectomy: Wavelength Analysis by the Spectrophotometer." In Arthroscopic Laser Surgery, 23. New York, NY: Springer New York, 1995. http://dx.doi.org/10.1007/978-1-4612-2468-6_5.

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9

Shibata, Kazuo. "Spectrophotometry of Opaque Biological Materials-Reflection Methods." In Methods of Biochemical Analysis, 217–34. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/9780470110256.ch6.

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10

Shibata, Kazuo. "Spectrophotometry of Translucent Biological Materials-Opal Glass Transmission Method." In Methods of Biochemical Analysis, 77–109. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/9780470110232.ch3.

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Тези доповідей конференцій з теми "Spectrophotometer analysi"

1

Vucane, Sanita, Martins Sabovics, Lauris Leitans, and Ingmars Cinkmanis. "Smartphone-based colorimetric determination of DPPH free radical scavenging activity in vegetable oils." In Research for Rural Development 2020. Latvia University of Life Sciences and Technologies, 2020. http://dx.doi.org/10.22616/rrd.26.2020.016.

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Free radicals can rapidly and irreversibly oxidize various structures, including unsaturated fatty acids in vegetable oils, which affect the sensory properties. Spectrophotometry is the most widely used method for the determination of free radical scavenging activity (RSA) using 2,2-diphenyl-1-picrylhydrazyl (DPPH). Barrier to the further use of classical analytical methods to analyze biologically active compounds in foodstuffs is that equipment requires high cost and has limited mobility. One of solutions is to replace classical methods, such as spectroscopy, with smartphonebased colorimetry. Huawei P30 Lite smartphone was used for colorimetric detection. The free radical scavenging activity (RSA) in vegetable oil was detected using an application ‘Color Picker’, with image matching algorithm for red, green, and blue (RGB) model. RSA was expressed as percentage and measured by the DPPH method. The aim of the study was to determinate the total free radical scavenging activity with smartphone-based colorimetry. For the data comparison and accuracy spectrophotometer as analytical optical instrument was used. Eleven vegetable oils: sea buckthorn, sunflower, rice, macadamia nut, hemp, corn, grape, linseed, rapeseed, olive and milk thistle oils were selected for analysis. The best results with no significant differences (p>0.05) compared to smartphone-based colorimetry from spectrophotometry were determined using RG values. The poor results were detected by using B value (p<0.05) and were not suitable for determination of RSA. Smartphone-based colorimetry can be used in the determination of the RSA in vegetable oils.
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Adachi, Masayuki, Yutaka Yamagishi, Kaori Inoue, and Kozo Ishida. "Automotive Emission Analyses using FTIR Spectrophotometer." In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/920723.

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3

Wyble, David R. "Analysis of spectrophotometer specular performance using goniometric information." In Fourth Oxford Conference on Spectroscopy, edited by Art Springsteen and Michael Pointer. SPIE, 2003. http://dx.doi.org/10.1117/12.514529.

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4

Teodorof, Liliana, Adrian Burada, Cristina Despina, Daniela Seceleanu-Odor, Cristian Trifanov, Antoaneta Ene, Elena Zubcov, Thomas Spanos, and Oleg Bogdevich. "Environmental toxicants evaluation in a modern monitoring system - Romanian monitox network area." In Xth International Conference of Zoologists. Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/icz10.2021.04.

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In this paper a class consisting of 8 environmental toxicants were selected to assess Danube River water quality between Calarasi-Silistra sector until the river flow into the Black Sea, the Romanian Monitox Network Area. A comprehnsive comparison between 2 years of investigations in terms of nutrients contribution, such as different forms of nitrogen (ammonium nitrogen (N-NH4+), nitrite nitrogen (N-NO2-), nitrate nitrogen (N-NO3-), organic nitrogen, total nitrogen (TN)) and phosphorus (orthophosphate phosphorus (P-PO4 -3), total phosphorus (TP)), was made in order to provide information on the spatial and temporal variations of this river water quality. Sampling was performed according to European standards and quantitatively analysed using molecular spectrophotometry using UV VIS spectrophotometer Perkin Elmer Lambda 650S. The obtained results showed differences in nitrite nitrogen loads in surface water samples with higher values in the samples collected from the sampling points situated at the mouths of the Danube River into the Black Sea in 2020. Regarding quality classes, the surface waters were generally framed, in good quality class. The nutrients concentrations, combined in CCME WQI index, give an overview on surface water quality assessement in Romanian Monitox Network Area, with a good quality of Lower Danube (Constanta in 2019 and 2020) and fair quality of Danube Delta in 2020, but very closed to good quality.
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5

Haponiuk, Andrii, Natalia Bezugla, Kostiantyn Vonsevych, Mikhail Bezuglyi, Aliya Zilgaraeva, Piotr Kisala, Saule Luganskaya, and Sandugash Orazalieva. "Blood glucose analysis by Raman spectrophotometer with ellipsoidal reflector." In Photonics Applications in Astronomy, Communications, Industry, and High Energy Physics Experiments 2021, edited by Andrzej Smolarz, Ryszard S. Romaniuk, and Waldemar Wojcik. SPIE, 2021. http://dx.doi.org/10.1117/12.2613340.

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6

Yang, Hongying, Shiyin Ding, and Pengfei Jiang. "Precision Analysis of Color Measurement by Different Spectrophotometers." In 3rd International Conference on Material, Mechanical and Manufacturing Engineering (IC3ME 2015). Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/ic3me-15.2015.190.

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7

Muraru, Sebastian. "RESEARCH ON SOIL PROPERTIES ANALYSIS USING SPECTROPHOTOMETRY." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/32/s13.060.

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8

Farquharson, Stuart, and Peter T. Keillor III. "Extruder Mixing Analysis Via A Fiber Optically Coupled Visible Spectrophotometer." In O-E/Fiber LASE '88, edited by Robert A. Lieberman and Marek T. Wlodarczyk. SPIE, 1989. http://dx.doi.org/10.1117/12.959979.

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9

LaDelfe, Peter C., and D. B. Stahl. "Spectrophotometer Design for the Characterization of Interference Coatings." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oic.1988.wc7.

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Commercially available spectrophotometers, designed to obtain spectra for chemical analysis, are commonly used to characterize optical components with interference coatings. In this application, they exhibit several shortcomings: the sample compartments do not accomodate large components, particularly at off-normal incidence; beam deviation introduces error in off-normal transmittance measurements; rigid beam geometry makes reflectance measurements at arbitrary angles of incidence difficult; reflectance measurements must be referenced to a standard; reflectance measurements at normal incidence are not possible; and the beam’s conic angle in the sample chamber introduces error in off-normal measurements and in the measurement of narrow bandpass filters. Previous attempts to alleviate these shortcomings1,2 have resulted in instruments which are mechanically complex, fail to address all the problems stated above, or are sensitive to the optical alignment.
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Huda, Thorikul, Durotun Nafisah, Suryati Kumorowulan, and Sri Lestari. "Quality control of test iodine in urine by spectrophotometry UV–Vis." In INTERNATIONAL CONFERENCE AND WORKSHOP ON MATHEMATICAL ANALYSIS AND ITS APPLICATIONS (ICWOMAA 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5016017.

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Звіти організацій з теми "Spectrophotometer analysi"

1

Bass, D. A., L. B. TenKate, and A. Wroblewski. Development of mixed-waste analysis capability for graphite furnace atomic absorption spectrophotometry. Office of Scientific and Technical Information (OSTI), March 1995. http://dx.doi.org/10.2172/105062.

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2

Maps and tables showing data and analyses of semiquantitative emmission spectrometry and atomic-absorption spectrophotometry of rock samples, Ugashik, Bristol Bay, and part of Karluk quadrangles, Alaska. US Geological Survey, 1986. http://dx.doi.org/10.3133/mf1539c.

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