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A novel equilibrium extraction technique employing hollow fibre liquid phase microextraction for trace enrichment of freely dissolved organophosphorus pesticides in environmental waters

In English

Författare

Summary, in English

A new design of equilibrium hollow fibre liquid phase microextraction (HF-LPME) was developed for the determination of three freely dissolved organophosphorus pesticides (OPPs), i.e. diazinon (O,O-diethyl-O-2-isopropyl-4-methyl-6-pyrimidyl thiophosphate), chlorpyrifos (O,O-diethyl-O-[3,5,6-trichloro-2-pyridyl] phosphorothioate), and fenthion (O,O-dimethyl-O-4-methylthio-m-tolyl phosphorothioate) as model compounds. In this new design a 1.2-1.4 cm length of a hollow fibre (HF), inserted to the end of 20 cm copper wire and impregnated with organic solvent, was used to extract the freely dissolved concentration of OPPs in various water samples. The limits of detection (LOD) in reagent water using gas chromatography-mass spectrometry in the selected ion monitoring (SIM) mode was in the range of 15-80 ng L-1. The relative standard deviations of the analysis (inter- and intra-day) were 8.7-30%. The method was applied to the extraction of spiked lake and ground water samples. The ground water sample was spiked at 0.1 and 0.2 g L-1 concentrations of the analytes under study and the average extraction efficiency at the two concentrations was below 1% showing the non-depletive nature of the extraction, meaning that the freely dissolved concentrations are measured as opposed to total concentrations. Good linearity was obtained for all of the analytes in both reagent water and lake water samples with correlation coefficients, R-2, ranging from 0.991 to 0.996, in the concentration ranges of 25-400 ng L-1. The method was found to be very simple and inexpensive, with the possibility of running hundreds of samples in parallel with very minimal expenses for the determination of freely dissolved OPPs.

Publiceringsår

2008

Språk

Engelska

Sidor

933-945

Publikation/Tidskrift/Serie

International Journal of Environmental Analytical Chemistry

Volym

88

Issue

13

Dokumenttyp

Artikel i tidskrift

Förlag

Taylor & Francis

Ämne

  • Analytical Chemistry

Nyckelord

  • organophosphorus pesticides
  • microextraction
  • freely dissolved concentration
  • hollow fibre liquid phase
  • GC-MS
  • non-depletive
  • extraction

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1029-0397