Zimmermann, Thomas ; Ensinger, Wolfgang ; Schmidt, Torsten C. (2006)
Depletion solid-phase microextraction for the evaluation of fiber-sample partition coefficients of pesticides.
In: Journal of chromatography A, 1102 (1-2)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A depletion solid-phase microextraction (SPME) method for the characterisation of SPME sorption for 13 pesticides selected as probe compounds is described. The sample is extracted and analysed multiple times by SPME-GC/MS. The observed depletion in peak areas is used for the calculation of extraction ratios that varied between 3 and 28% for a PDMS fiber with confidence intervals between 0.7 and 5.4%. Apparent fiber-sample partition coefficients can be calculated and extrapolated to equilibrium conditions if specific sorption kinetics are known. Under the chosen conditions, problems were encountered for more polar compounds (log Kow < 3) due to inefficient extraction. The extracted amount was found to be the decisive parameter for depletion SPME and the extraction conditions therefore need to be adapted to the polarity of the analyte. The importance of the initial analyte concentration especially for mixed-mode fibers is demonstrated. Compared with conventional external calibration using liquid injection, depletion SPME eliminates uncertainties due to solvent effects during injection. Furthermore, it does neither require authentic reference compounds nor knowledge of the initial analyte concentration, and thus can even be used for unknowns.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2006 |
| Autor(en): | Zimmermann, Thomas ; Ensinger, Wolfgang ; Schmidt, Torsten C. |
| Art des Eintrags: | Bibliographie |
| Titel: | Depletion solid-phase microextraction for the evaluation of fiber-sample partition coefficients of pesticides |
| Sprache: | Englisch |
| Publikationsjahr: | 13 Januar 2006 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of chromatography A |
| Jahrgang/Volume einer Zeitschrift: | 1102 |
| (Heft-)Nummer: | 1-2 |
| Kurzbeschreibung (Abstract): | A depletion solid-phase microextraction (SPME) method for the characterisation of SPME sorption for 13 pesticides selected as probe compounds is described. The sample is extracted and analysed multiple times by SPME-GC/MS. The observed depletion in peak areas is used for the calculation of extraction ratios that varied between 3 and 28% for a PDMS fiber with confidence intervals between 0.7 and 5.4%. Apparent fiber-sample partition coefficients can be calculated and extrapolated to equilibrium conditions if specific sorption kinetics are known. Under the chosen conditions, problems were encountered for more polar compounds (log Kow < 3) due to inefficient extraction. The extracted amount was found to be the decisive parameter for depletion SPME and the extraction conditions therefore need to be adapted to the polarity of the analyte. The importance of the initial analyte concentration especially for mixed-mode fibers is demonstrated. Compared with conventional external calibration using liquid injection, depletion SPME eliminates uncertainties due to solvent effects during injection. Furthermore, it does neither require authentic reference compounds nor knowledge of the initial analyte concentration, and thus can even be used for unknowns. |
| Freie Schlagworte: | Solid-phase microextraction; Partition coefficients; Pesticides; Extraction ratios; Depletion |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialanalytik |
| Hinterlegungsdatum: | 20 Nov 2008 08:26 |
| Letzte Änderung: | 20 Feb 2020 13:23 |
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