Extracted amounts by solid-phase microextraction: A realistic approach to the partition coefficient K
Louise Urruty,Michel Montury +1 more
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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
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Sorption of Very Hydrophobic Organic Compounds onto Poly(dimethylsiloxane) and Dissolved Humic Organic Matter. 1. Adsorption or Partitioning of VHOC on PDMS-Coated Solid-Phase Microextraction FibersA Never-Ending Story?
TL;DR: In this paper, the problem of analyte extraction by poly(dimethylsiloxane) (PDMS) fiber coatings turned out to be mainly attributed to experimental errors when applying conventional static SPME approaches.
Journal ArticleDOI
Solid-phase microextraction fibre-water distribution constants of more hydrophobic organic compounds and their correlations with octanol-water partition coefficients.
A. Paschke,Peter Popp +1 more
TL;DR: Fibre coating-water distribution constants (Kfw) of more hydrophobic chemicals were determined with six different solid-phase microextraction fibre types by fibre exposure to agitated large-volume water samples lasting several days, comparable with Kfw values obtained under dynamic conditions.
Journal ArticleDOI
Determination of phenylurea herbicides in natural waters at concentrations below 1 ng l−1 using solid-phase extraction, derivatization, and solid-phase microextraction–gas chromatography–mass spectrometry
TL;DR: The precision and sensitivity of the developed analytical method allowed the investigation of the fate of PUHs in lakes, their degradation during drinking water treatment and their transport within the North Sea.
Journal ArticleDOI
Simultaneous multi-elemental speciation analysis of organometallic compounds by solid-phase microextraction and multicapillary gas chromatography hyphenated to inductively coupled plasma-time-of-flight-mass spectrometry
TL;DR: In this paper, a simple, rapid and accurate method on the basis of solid phase microextraction (SPME) in combination with multicapillary gas chromatography hyphenated to inductively coupled plasma-time-of-flight mass spectrometry (ICP-TOFMS) was developed for simultaneous speciation analysis of 10 organometallic compounds of mercury (including inorganic mercury), tin and lead.
Journal ArticleDOI
Multiple solid-phase microextraction: Theory and applications
TL;DR: A review of the state of the art in MSPME, including theory and applications, can be found in this article, where the authors also discuss the limits of detection and quantification, and the use of this methodology to determine fiber-sample distribution constant.
References
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Journal ArticleDOI
Detection of substituted benzenes in water at the pg/ml level using solid-phase microextraction and gas chromatography-ion trap mass spectrometry.
David W. Potter,Janusz Pawliszyn +1 more
TL;DR: The combined method SPME-GC-IT-MS, using fibers coated with a 100-microns polydimethylsiloxane coating, showed a limit of quantitation (LOQ) of 50 pg/ml benzene in water, which exceeds the requirements of both the United States Environmental Protection Agency method 524.2 and the Ontario Municipal/Industrial Strategy for Abatement program.
Journal ArticleDOI
Solid-phase microextraction of nitrogen-containing herbicides
TL;DR: In this article, a solid phase microextraction (SPME) method coupled with GC-MS, GC-NPD and GC-FID has been developed for the analysis of 22 nitrogen-containing herbicides in water.
Journal ArticleDOI
Analysis of organochlorine pesticides using solid-phase microextraction
Sonia Magdic,Janusz Pawliszyn +1 more
TL;DR: A solid-phase microextraction (SPME) procedure has been developed to successfully extract eighteen chlorine-containing pesticides from water using a fused-silica fiber coated with a non-polar polydimethylsiloxane stationary phase.
Journal ArticleDOI
Environmental analysis of organic compounds in water using solid phase micro extraction
TL;DR: The sensitivity of the method was determined by the thickness of the film of stationary phase; the equilibration time, however, increased with the film thickness, although it can be minimized by use of a cross-shaped stirrer bar as discussed by the authors.
Journal ArticleDOI
Determination of Pesticides in Aqueous Samples by Solid-Phase Microextraction In-Line Coupled to Gas Chromatography-Mass Spectrometry
Ralf Eisert,Karsten Levsen +1 more
TL;DR: At a target limit of detection below 100 ng/L, SPME-GC/MS represents a very simple, fast, selective, and solvent-free multimethod for the extraction and determination of these nitrogen- and phosphorous-containing pesticides from aqueous samples.