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- W2095278883 abstract "The screening of agricultural samples to determine 17 synthetic pyrethroids was investigated. Samples were lyophilised without losses of the insecticides, and then extracted with n-hexane. A simple, continuous preconcentration–elution system was developed, which included a silica sorbent column (packed with 50 mg) and used an air stream to carry the eluent (ethyl acetate) which minimised the eluate volume thus increasing the preconcentration factor; so no evaporation step was required. Pyrethroids were determined by gas chromatography–electron capture detection (GC–ECD) by using a 5% phenylmethylpolysiloxane-coated fused-silica capillary column; gas chromatography–mass spectrometry was used to identify the pyrethroids detected by GC–ECD monitoring. Limits of detection varied between 0.1 and 0.8 ng/ml (except for piperonyl butoxide, 25 ng/ml) with linear ranges from 1 to 200 ng/ml; the precision of the method was high (3–6%). Recoveries of 17 insecticides from 14 different agricultural samples fortified at levels of 20–100 ng/g ranged from 66 to 102% (bifenthrin and deltamethrin were those providing the lowest values, 66–87%). Pyrethroids were detected in eight samples (from the 100 unfortified agricultural samples tested) at concentrations lower than the established maximum residue limits (MRLs)." @default.
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- W2095278883 date "2001-03-01" @default.
- W2095278883 modified "2023-10-11" @default.
- W2095278883 title "Selective enrichment of 17 pyrethroids from lyophilised agricultural samples" @default.
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- W2095278883 doi "https://doi.org/10.1016/s0021-9673(01)00546-5" @default.
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