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Stankova A.,CNRS Analytical Sciences Lab | Stankova A.,Masaryk University | Gilon N.,CNRS Analytical Sciences Lab | Dutruch L.,Service Central dAnalyse | Kanicky V.,Masaryk University
Fuel | Year: 2010

An evaluation of quantitative analysis of major elements (Ca, Al, Mg, Si and Fe) present in fly ashes was made using a simple and cost effective LIBS system. LIBS parameters were optimized to obtain best sensitivity and repeatability. In this purpose different binders were compared, leading to best sensitivity and mechanical stability when a binder containing silver and cellulose was employed in a 1:1 mass ratio. In order to be able to determine major elements in different fly ashes, a multi-matrix calibration was employed. Four reference materials were employed for calibration and five other fly ashes were selected as sample. Concentrations obtained by LIBS were compared to wet acid digestion and alkali fusion followed by ICP-OES analysis. Ca, Mg, Fe, Si and Al concentrations found using the LIBS method developed were in a good agreement with the values obtained by classical methods. © 2010 Elsevier Ltd. All rights reserved. Source


Stankova A.,CNRS Analytical Sciences Lab | Stankova A.,Masaryk University | Gilon N.,CNRS Analytical Sciences Lab | Dutruch L.,Service Central dAnalyse | Kanicky V.,Masaryk University
Journal of Analytical Atomic Spectrometry | Year: 2011

In this work quantitative analysis of minor and trace elements in fly ash by nanosecond laser ablation (LA)-ICP-MS and LA-ICP-OES was investigated in terms of detection limits and accuracy. Different binders and modifiers (silver or chromophores) were added to the fly ash powder to prepare mechanically stable pellets and improve sensitivity (signal to concentration ratio). Maleic acid was found to provide a higher degree of homogeneity between sensitivities across the different fly ashes tested. Ashes were from different origins: domestic waste incinerator or ashes from various coal-fired power plants. A calibration procedure using reference materials as standards was employed, the LA-ICP-MS analysis gave an acceptable accuracy (estimated from NIST 1633), better results were obtained using fused bead preparation. The use of the LA-ICP-OES system gave, when possible (higher concentrations), good results in terms of detection limits (1 to 11 g g-1) and accuracy. © 2011 The Royal Society of Chemistry. Source


Khadro B.,University Claude Bernard Lyon 1 | Betatache A.,University Claude Bernard Lyon 1 | Sanglar C.,Service Central dAnalyse | Bonhomme A.,Service Central dAnalyse | And 2 more authors.
Sensor Letters | Year: 2011

In this work, sensors based on molecularly imprinted polymers (MIP) for creatinine and urea selective determination using solvent evaporation processing of poly(ethylene-co-vinyl alcohol) (EVAL) to form molecularly imprinted polymers (MIP) were fabricated. The chemical behaviour of the thin film (MIP) was characterized using FTIR spectrophotometry. The carbonyl functions assigned on the spectra confirmed capture and removal (after rinsing with ethanol) of template molecule. Electrochemical impedance method was employed as transduction technique. The EIS (Electrochemical Impedance Spectroscopy) sensor response shows a limit of detection of 10 ng/mL with linear range from 0.02 μg/mL to 3 μg/mL for urea and 40 ng/mL of detection limit with linear range from 0.05 μg/mL to 2 μg/mL for creatinine with a good specificity of detection. Copyright © 2011 American Scientific Publishers All rights reserved. Source


Khadro B.,University Claude Bernard Lyon 1 | Sanglar C.,Service Central dAnalyse | Bonhomme A.,Service Central dAnalyse | Errachid A.,University Claude Bernard Lyon 1 | Jaffrezic-Renault N.,University Claude Bernard Lyon 1
Procedia Engineering | Year: 2010

In this work, sensors based on molecularly imprinted polymers (MIP) for creatinine and urea selective determination using solvent evaporation processing of poly(ethylene-co-vinyl alcohol), (EVAL) to form molecularly imprinted polymers (MIP) were fabricated. The chemical behaviour of the thin film (MIP) were characterized using FTIR spectrophotometry. The carbonyl functions assigned on the spectra confirmed capture and removal (after rinsing with 20 mL of ethanol) of template molecule. Electrochemical impedance method was employed as transduction technique. The EIS (Electrochemical Impedance Spectroscopy) sensor response shows a limit of detection of 10 ng/mL with linear range from 0.02 μg/mL to 3 μg/mL for urea and 40 ng/mL of detection limit with linear range from 0.05 μg/mL to 2 μg/mL for creatinine with a good specificity of detection. Source


Pujos E.,Service Central dAnalyse | Cren-Olive C.,Service Central dAnalyse | Goetinck P.,Service Central dAnalyse | Flament-Waton M.M.,Service Central dAnalyse | Grenier-Loustalot M.F.,Service Central dAnalyse
Analytical Letters | Year: 2012

A multiresidue method was developed for screening, quantification, and confirmation of nine natural androgen steroids and their metabolites in urine. Steroids were first extracted from urine by solid phase extraction, enzymatically deglucuronated, re-extracted using a liquid/liquid extraction for purification, and finally acetylated for GC/MS and GC/FID analysis. Each step of sample preparation, as well as analysis, was optimized: solid phase extraction, liquid/ liquid extraction, and derivatization reaction... Therefore, a rugged sample preparation procedure was developed leading to extracts of sufficient purity (recoveries >66% and few matrix compounds). The whole methodology allowed reliable detection and quantification of the nine steroids at low concentration levels. Linearity and repeatability were established and were found to be satisfactory (R 2 > 0.996, RSD < 11%). Finally, the method was applied to quantify compounds of interest in real samples collected from healthy volunteers and patients treated with 4-androstenedione or dehydroepiandrosterone. © 2012 Copyright Taylor and Francis Group, LLC. Source

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