Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"matrix effects"”.
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Matrix Effects on Electrochemical Oxidation of PFAS in Real Wastewater Systems
… by the chemical composition of the water matrix, which can impact reaction kinetics, electrode performance, and byproduct formation. This thesis systematically investigates the effects of background matrix constituents on PFAS electrochemical oxidation in three distinct wastewater types: …
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Investigation of Matrix Effects in the Analytical Performance of Solution Cathode Glow Discharge Coupled to Optical Emission Spectroscopy
Tesis doctoral por compendio de publicaciones
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Ion Transmission in the first vacuum stage of an Inductively Coupled Plasma Mass Spectrometer
… 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 …
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Analysis of Strobilurin Fungicides, Neonicotinoid Insecticides and Degradation Products in Atmospheric Particles
… and apple orchards are the dominant crops. Matrix effect was determined to evaluate the performance of the developed sample clean-up procedure to remove the matrix. The determined matrix effect revealed that the highest exhibited matrix effects were for metabolites of neonicotinoids, while …
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Prey-mediated effects of imidacloprid on Laricobius nigrinus (Coleoptera: Derodontidae) and Sasajiscymnus tsugae (Coleoptera: Coccinellidae), two predators of hemlock woolly adelgid
Prey-mediated effects of imidacloprid were evaluated for Laricobius nigrinus Fender and Sasajiscymnus tsugae Sasaji and McClure after feeding on hemlock woolly adelgid (HWA), Adelges tsugae Annand (Hemiptera: Adelgidae). Two methods were evaluated for detecting imidacloprid in hemlock tissues: a …
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Mechanisms of Enhancement in Dual Pulse Laser Induced Breakdown Spectroscopy and Quantitative Measurements of Laser Induced Breakdown Spectroscopy in Bulk Aqueous Solution
… other analytical techniques is the presence of matrix effects. This chapter shows how the presence of different combinations of ions in solution affects the LIBS</p> <p>emission intensity. This is a significant problem for LIBS in solids and in air, but the results delineated in this chapter …
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Relationships between electron transport and redox center concentrations within molecular networks
… structure of redox centers, and intervening matrix effects. In dilute systems, $D\sb E$ rises sharply with redox center concentration, $C$; however at large C's, the hard sphere $D\sb E$ reaches a limiting value due to packing. Hard-sphere $D\sb E$ values for metalloprotein kinetics and a …
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Oxygen and hydrogen isotopic analysis of tourmaline by secondary ion mass spectrometry
… standards and samples to correct for both matrix effects and instrumental mass fractionation (IMF), collectively termed instrumental mass bias (IMB). For certain mineral groups (e.g. tourmalines), there are large variations in major element composition between species. This study uses three …
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Lichens as biomonitors for atmospheric polycyclic aromatic hydrocarbons
… equilibration time (12 hr) on the lichen matrix for optimal recoveries, a new finding. Matrix matched standards were prepared and strong matrix effects were found; both strong enhancement (for the lighter PAHs) and strong suppression (for the heavier PAHs) were observed. The use of matrix …
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Detection of Progesterone in Cow’s Milk for the Prediction of Reproductive Performance
… in cow’s milk one must overcome the milk matrix effects, negating the interference of the various components in milk on the measurement. The aim of the thesis is to develop a sensitive and practical test to measure P4 in cow’s milk for potential application in estrus detection. To reduce …
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LC-MS/MS determination of various drugs of abuse and metabolites in municipal wastewater effluent samples
… The extraction method was validated with matrix matched spiked samples at the limits of quantitation (0.5 ng/mL to 30 ng/mL) for each analyte with recoveries ranging from 70%-140%. Deuterated internal standards for each analyte were used to correct for matrix effects, ion suppression, and …
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Detection of glial interleukin-6 release: Development of a novel interleukin-6 Elisa
… techniques were attempted including matrix effects, non-specific binding, and coating buffer pH differences. In comparison to the ELISA, the LOD for IL-6 using the 7TD1 bioassay was 2--5 pg/mL. Therefore the 7TD1 bioassay was implemented for the experiments described in this study. …
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The Analysis of Flavor Compounds in Green Tea Using Ice Concentration Linked with Extractive Stirrer (Icecles)
… relatively high cost, long preparation time, and matrix effects. Ice concentration linked with extractive stirrer (ICECLES) is a promising new sample preparation technique, especially for the extraction of relatively polar compounds, which may prove to have widespread applicability for analytical …
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Fundamental Studies of Femtosecond Laser Interactions with Solids and Their Applications to Laser Ablation Inductively Coupled Plasma Mass Spectrometry for Environmental Analysis
… Elemental and isotopic fractionation, matrix effects and the absence of matrix-matched standards are problems that limit applications of this technique for routine analysis. The introduction of femtosecond laser pulses has improved the analytical capabilities of this technique in terms …
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Development and Validation of Laser-Induced Breakdown Spectroscopy Methods for the Analysis of Aqueous Solutions
… variation of the LIBS signal based on the sample matrix and introduction technique. The goal of the work in this dissertation is to develop and validate new LIBS methods that allow for analysis of a broader range of sample types, particularly aqueous solutions, and minimize matrix effects. …
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Antibody-Based Detection of 3-Methylglutaconic Acid
… tested for reproducibility, specificity, and matrix effects in urine. In seven of 11 assays analyzed for inter-assay precision, the limit of detection (LOD) for measurement of 3MGA averaged 1.51 mg/mL with a coefficient of variation (CV%) of 31%. Specificity testing of similar dicarboxylic …
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Expanding the Capabilities of Paper Spray Mass Spectrometry: High-Throughput Drug Screening and On-Paper Electrokinetic Stacking
… for certain analytes, susceptibility to matrix effects in complex samples, and inconsistent quantitative performance. Such limitations have restricted the application of PS-MS in fields requiring high sensitivity in analysis of complex biological matrices. This dissertation explores …
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Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean
… less than 200 ppm is observed (2[sigma]). Matrix effects are significant with concomitant calcium in SRM-981 (-280 ppm at 257 [mu]M [Ca]).
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Greenhouse Gas Production and Nutrient Reductions in Denitrifying Bioreactors
… to variable sample processing and to correct for matrix effects on gas partitioning that may occur in environmental samples.
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