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- W341899338 abstract "A comparative study was undertaken to find out the optimum solid-phase extraction (SPE) of water samples for 10 herbicide residues. Two polymer-based sorbents, balanced copolymer of lipophilic divinylbenzene monomer and hydrophilic N-vinylpyrrolidone monomer (HLB) and polystyrene-divinylbenzene copolymer (PS-2) cartridge, were investigated for extraction efficiency of neutral and weak ionic herbicide residues from water samples. Each SPE cartridges was activated by water-miscible solvents, washed with water, and than loaded with 400 to 1,000 mL of water samples containing herbicides. The trapped residue was eluted with acetonitrile and dichloromethane for HLB and PS-2 cartridges, respectively, and followed by determination using triple quadrupole LC/MS in the selective-reaction monitoring mode. Electrospray ionization was successfully applied to form positive or negative molecular ions of target analytes, and product ions derived from the precursor ions were selectively detected. Mean recoveries of HLB extraction were more than 70% except molinate. cyhalofop-butyl and pentoxazone showing poor recovery of 32~64%. In PS-2 extraction, bentazone and imazosulfuron were not trapped, while recoveries of other herbicides ranged 57~87%. Relative standard deviations of two methods were in the range of 1~6% and 1~13% HLB and PS-2 cartridge, respectively. According to herbicides properties, each sorbents could be selectively employed for extraction of herbicide residues from water samples. The proposed method was simple to operate and highly specific being coupled with tandem mass spectrometric quantitation." @default.
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- W341899338 date "2009-01-01" @default.
- W341899338 modified "2023-09-22" @default.
- W341899338 title "Determination Herbicide Residues in Water Sample Using Solid-phase Extraction and Tandem LC-MS/MS" @default.
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