Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1117, Issue 1, Pages 31-37Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2006.03.102
Keywords
liquid-phase microextraction; carbamate pesticides; on-column derivatization
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A method has been established for the determination of five carbamate pesticides in water samples using liquid-phase microextraction (LPME) followed by on-column derivatization and gas chromatography-mass spectrometric (GC-MS) determination. Trimethylphenylammonium hydroxide (TMPAH) and trimethylsulfonium hydroxide (TMSH) were used as derivatization reagent for extracts prior to GC-MS analysis as carbamate pesticides are thermally labile compounds. Parameters that affect the extraction efficiency (selection of organic solvent and extraction time) and derivatization efficiency (choice of derivatization reagent and concentration of derivatization reagent) were investigated. The proposed method provided good enrichment factors up to 224, with reproducibility ranging front 4.86 to 7.81 %, and good linearity from I to 400 mu g/L. The limits of detection (LODs) ranged between 0.2 and 0.8 mu g/L (S/N = 3) using GC-MS with selective ion monitoring. This method was applied to the determination of carbamate pesticides in tap water and waste water. (c) 2006 Elsevier B.V. All rights reserved.
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