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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

Berhanu, Tarekegn; Megersa, Negussie; Solomon, Theodros and Jönsson, Jan Åke LU (2008) In International Journal of Environmental Analytical Chemistry 88(13). p.933-945
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
organophosphorus pesticides, microextraction, freely dissolved concentration, hollow fibre liquid phase, GC-MS, non-depletive, extraction
in
International Journal of Environmental Analytical Chemistry
volume
88
issue
13
pages
933 - 945
publisher
Taylor & Francis
external identifiers
  • wos:000259649200003
  • scopus:53149152606
ISSN
1029-0397
DOI
10.1080/03067310802357803
language
English
LU publication?
yes
id
2607f532-2257-4126-b464-73261636f37e (old id 1286063)
date added to LUP
2009-02-04 09:55:14
date last changed
2017-01-01 04:48:08
@article{2607f532-2257-4126-b464-73261636f37e,
  abstract     = {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.},
  author       = {Berhanu, Tarekegn and Megersa, Negussie and Solomon, Theodros and Jönsson, Jan Åke},
  issn         = {1029-0397},
  keyword      = {organophosphorus pesticides,microextraction,freely dissolved concentration,hollow fibre liquid phase,GC-MS,non-depletive,extraction},
  language     = {eng},
  number       = {13},
  pages        = {933--945},
  publisher    = {Taylor & Francis},
  series       = {International Journal of Environmental Analytical Chemistry},
  title        = {A novel equilibrium extraction technique employing hollow fibre liquid phase microextraction for trace enrichment of freely dissolved organophosphorus pesticides in environmental waters},
  url          = {http://dx.doi.org/10.1080/03067310802357803},
  volume       = {88},
  year         = {2008},
}