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Simultaneous Determination of Pesticides in Water Using a GC/MS Coupled with Micro Extraction by Packed Sorbent
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 Title & Authors
Simultaneous Determination of Pesticides in Water Using a GC/MS Coupled with Micro Extraction by Packed Sorbent
Lee, Ki-chang; Lee, Wontae;
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This study established an analytical method to simultaneously determine six organophosphorous pesticides [methyldemetone-S, diazinon, fenitrothion, parathion, phentoate, and O-ethyl O-(4-nitrophenyl) phenylphosphonothioate (EPN)] and carbaryl in water using a gas chromatography/mass spectrometry (GC/MS) system coupled with on-line micro extraction by packed sorbent (MEPS) and programmed temperature vaporizer (PTV) injector. Polystyrene divinylbenzene (PDVB) was used as a sorbent of MEPS. The effects of elution solvents, pH, elution volume and draw-eject cycles of samples on sample pretreatment process were investigated. Also, quality assurance and quality control (QA/QC) and the recovery of the pesticides in environmental samples were evaluated. The elution was performed using of a mixed solvent (acetone : dichloromethane = 80 : 20 (v/v)). Sample pretreatment processes were optimized with seven cycles of draw-eject of sample (1 mL) spiking an internal standard and sulfuric acid. At lower pH, the analytical sensitivity of diazinon decreased, but that of carbaryl increased. The method detection limit and the limit of quantification for this method were 0.02~0.18 and , respectively. The method precision and accuracy were 1.5~11.5% and 83.3~129.8%, respectively, at concentrations of . The recovery rates for all the pesticides except carbaryl in various environmental samples ranged 75.7~129.3%. The recovery rate of carbaryl in effluent sample was over 200% whereas carbaryl in drinking water, groundwater, and river water were in the acceptable range.
Organochlorine Pesticides;Carbaryl;Micro Extraction by Packed Sorbent (MEPS);Polystyrene Divinylbenzene (PDVB);Gas Chromatography Mass Spectrometry;Limit of Quantification;
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