A simplified method for determining 4 pyrethroid insecticides (Fenpropathrin, Cypermethrin, Fenvalirate, and Deltamethrin) in Chrysanthemi is described. Standards were fortified in to Chrysanthemi (5g) with two levels...A simplified method for determining 4 pyrethroid insecticides (Fenpropathrin, Cypermethrin, Fenvalirate, and Deltamethrin) in Chrysanthemi is described. Standards were fortified in to Chrysanthemi (5g) with two levels, 0.1-1 pp m the pyrethroid pesticides are extracted with petroleum ether and cleaned up by natural aluminum oxide. The extracts are analyzed by gas chromatography equipped with electron capture detector (ECD). Analysis of fortified Chrysanthemi (n = 3) shows recovery range from 99-102 % at 1 pp m level and 93-104 % at 0.1 pp m level. The coefficient of variation of the method at 1 st level was 0.12 and 0.14 for 2 ed level. The detection limits of the method ranged from 0.04pp b to 28 pp b. The method is rapid, sample, and sensitive and is applicable to the determination of Fenpropathrin, Cypermethrin, Fenvalirate, and Deltamethrin in Chrysanthemi.展开更多
本文报道了一个简单快速的拟除虫菊酯多残留气相色谱分析方法。样本经提取净化后,川^(63)Ni 电子捕获检测器测定,色谱柱为0.5M×3mmU 形玻璃柱,固定液3%OV-101+3%Apeizon,担体为 Gas ChromQ60~80目,对溴氰菊酯等6种拟除虫菊脂在19...本文报道了一个简单快速的拟除虫菊酯多残留气相色谱分析方法。样本经提取净化后,川^(63)Ni 电子捕获检测器测定,色谱柱为0.5M×3mmU 形玻璃柱,固定液3%OV-101+3%Apeizon,担体为 Gas ChromQ60~80目,对溴氰菊酯等6种拟除虫菊脂在19分钟内完全分离。经河川水、土壤、水果、蔬菜、谷物等13种样本测定回收率在80~100%之间,变异系数为0.8~8.7%,6种农药的最小检测量在1×10^(-12)~5×10^(-12)g 之间。最低检出浓度在0.001~0.006ppm。展开更多
文摘A simplified method for determining 4 pyrethroid insecticides (Fenpropathrin, Cypermethrin, Fenvalirate, and Deltamethrin) in Chrysanthemi is described. Standards were fortified in to Chrysanthemi (5g) with two levels, 0.1-1 pp m the pyrethroid pesticides are extracted with petroleum ether and cleaned up by natural aluminum oxide. The extracts are analyzed by gas chromatography equipped with electron capture detector (ECD). Analysis of fortified Chrysanthemi (n = 3) shows recovery range from 99-102 % at 1 pp m level and 93-104 % at 0.1 pp m level. The coefficient of variation of the method at 1 st level was 0.12 and 0.14 for 2 ed level. The detection limits of the method ranged from 0.04pp b to 28 pp b. The method is rapid, sample, and sensitive and is applicable to the determination of Fenpropathrin, Cypermethrin, Fenvalirate, and Deltamethrin in Chrysanthemi.