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- W965431980 abstract "Two procedures were compared for extraction and clean-up of 20 organophosphorus and 19 pyrethroid pesticides in sediment to identify the more effective procedure for groups of pesticides or individual compounds. In Procedure Ⅰ,methanol/water and n-hexane were used for extraction,and 1:10 (v/v) dichloromethane in n-hexane and acetone were used as eluents for eluting the analyte through the cartridge,with one evaporating steps on a rotary evaporator and two eluting steps on the cartridge. n-hexane/acetone (2:1,v/v) was used for extraction and elution in Procedure Ⅱ with one evaporating step on a rotary evaporator and one eluting step on the cartridge. All extractions were performed under an ultrasonic bath and gas chromatography and mass spectrometry were utilized for measurements. Procedure Ⅱ was developed as a rapid,timesaving,less costly and safer substitute for Procedure Ⅰ which was an old method. Procedure Ⅱ was more effective for ahnost all the organophosphorus pesticides tested and 11 of the 19 pyrethroid pesticides,while Procedure Ⅰ was more appropriate for analysis of 5 pyrethroid pesticides. However,recoveries of most pyrethroid pesticides were fairly low. Thus,further studies should focus on adjustment and formulation of solvents for more efficient extraction and clean-up of pyrethroid pesticides from sediment samples." @default.
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- W965431980 date "2004-01-01" @default.
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- W965431980 title "Comparison of Two Procedures for Extraction and Clean-up ofOrganophosphorus and Pyrethroid Pesticides in Sediment" @default.
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