Extracted amounts by solid-phase microextraction: A realistic approach to the partition coefficient K
Louise Urruty,Michel Montury +1 more
TLDR
In this paper, a depletion experiment method is suggested that consists of running several SPMEs from the same standard sample with the same conditions and fitting the resulting data into an experimental regression curve, the exponential coefficient of which affords an absorption coefficient characteristic of the fiber/analyte system in a defined work-up.Abstract:
Because of its numerous advantages, the solventless solid-phase microextraction (SPME) sampling method coupled with an efficient chromatographic technique is used more and more to develop new analytical methods pertaining to organic molecules at low concentration in aqueous solutions, especially in the field of environmental chemistry. In a usual analytical procedure, the amount of analyte extracted by the fiber need not be determined, because the quantitation step of the analysis is mainly achieved using SPME external calibration. For some purposes, however, the determination of the partition coefficient K relative to a particular fiber for a specific analyte (for example) has to be calculated with accuracy. The traditional method consists of determining the response coefficient of the detector used for the analyte through a direct-injection calibration curve made from standard solutions in organic solvents and reporting it with the signal observed for the analytical sample. For the same goal, a depletion experiment method is suggested that consists of running several SPMEs from the same standard sample with the same conditions and then fitting the resulting data into an experimental regression curve, the exponential coefficient of which affords an absorption coefficient characteristic of the fiber/analyte system in a defined work-up. This self-calibrating method is revealed to be much more accurate than the previous one. Four pesticides in water solution were chosen to exemplify this study.read more
Citations
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Indirect analysis of urea herbicides from environmental water using solid-phase microextraction.
TL;DR: A solid-phase microextraction procedure used to extract six urea pesticides-- chlorsulfuron, fluometuron, isoproturon, linuron, metobromuron and monuron--from environmental samples to achieve a sensitive method is described.
Journal ArticleDOI
Quantitative analysis of volatile selenium metabolites in normal urine by headspace solid phase microextraction gas chromatography-inductively coupled plasma mass spectrometry.
Maïté Bueno,Florence Pannier +1 more
TL;DR: The combination of headspace-solid phase microextraction (HS-SPME) and gas chromatography-inductively coupled plasma mass spectrometry (GC-ICPMS) was evaluated for the determination of volatile selenium metabolites in normal urine samples, i.e. without seenium supplementation.
Journal ArticleDOI
Solutions and challenges in sample preparation for chromatography.
TL;DR: In this review, the progress made in the last few years in sample preparation for chromatography is examined and discussed in comparison with previous achievements in the field.
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Determination of siloxane-water partition coefficients by capillary extraction-high-resolution gas chromatography study of aromatic solvents.
TL;DR: Partition coefficients of benzene, toluene, ethylbenzene and xylenes (BTEX), between crosslinked polydimethylsiloxane and water, were determined at room temperature by capillary extraction coupled to open tubular gas chromatography (in-tube SPME).
References
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Book
Solid phase microextraction : theory and practice
TL;DR: The inventor of the technique, Janusz Pawliszyn, describes the theoretical and practical aspects of this new technology, which received an "RD" rating.
Journal ArticleDOI
Automation and optimization of solid-phase microextraction
TL;DR: The solid phase microextraction (SPME) technique as mentioned in this paper involves exposing a fused silica fiber that has been coated with a stationary phase to and aqueous solution containing organic contaminants.
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Rapid determination of polyaromatic hydrocarbons and polychlorinated biphenyls in water using solid-phase microextraction and GC/MS.
David W. Potter,Janusz Pawliszyn +1 more
TL;DR: Solid-phase microextraction was investigated as a solvent-free alternative method for the extraction and analysis of nonpolar semivolatile analytes and eliminates the loss of analytes through adsorption onto container walls and saves transport costs.
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Solid Phase Microextraction for Quantitative Analysis in Nonequilibrium Situations
TL;DR: In this article, a theoretical model is proposed to deal with the dynamic adsorption process of solid phase microextraction (SPME), and a steady-state diffusion is assumed for SPME in an effectively agitated sampling medium.
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Analysis of Substituted Benzene Compounds in Groundwater Using Solid-Phase Microextraction
TL;DR: In this paper, Solid Phase Microextraction (SPME) was applied to the analysis of benzene, toluene, ethyl benzene and xylenes in groundwater.