Pesticide Multiresidue Test and Analysis in Cowpea at Different Seasons by ASE-GPC-GC/MS
ASE-GPC-GC/MS method was adopted to test pesticide multiresidue at different seasons in cowpeas colected from 'Xinfadi' wholesale market of agricultural products in Beijing. The linearities of 31 kinds of pesticides ranged from 0.02-1.00 μg L-1 were good,with over 0.99 correlation coefficients. The recoveries of 3 μg for 8 pesticides were 73.49%~130.12%. The results showed that the pesticedes used with higher frequency during cowpea cultivation were cyfluthrin and dimethomorph(taking 53.85%);followed by omethoate(42.13%), procymidone(34.62%)and bifenthrin(42.31%). There were 3 kinds of pesticides with residues exceeding tolerence,they were omethoate,parathion and cypermerthrin. The pesticide quantity used in summer was obviously increased. The ASE-GPC-GC/MS testing method is simple,fast,accurate and solvent save. It can be used for determination of pesticide multiresidues in vegetables.
国家科技期刊平台
NSTL
万方数据
维普
