液相色谱串联质谱法(LC-MS)检测人参和土壤中辛硫磷的残留消解动态  

Residual Decline of Phoxim in Panax ginseng and soil by LC-Ms

作　　者：崔丽丽[1,2] 王春伟[1] 高洁[1] 许允成[1] 王燕[1] 张益铭[1] 

机构地区：[1]吉林农业大学,长春130118 [2]中国农科院特产研究所,长春130118

出　　处：《农药》2013年第8期593-595,共3页Agrochemicals

基　　金：吉林省世行贷款农产品质量安全项目(2011-Z24);吉林省2011年人参产业发展专项资金项目(2011省财政厅)

摘　　要：[方法]了解吉林长白山人参和土壤中辛硫磷的消解动态。建立液相色谱串联质谱(LC-MS)检测人参和土壤中辛硫磷残留的分析方法,并在吉林省抚松县进行了试验研究。[结果]不同质量分数(0.01、0.02、0.2 mg/kg)辛硫磷的添加回收率试验结果表明:人参和土壤中平均回收率分别为86.80%～90.40%、85.10%～87.00%,变异系数分别为8.64%～10.10%、6.89%～9.73%。残留动态试验结果显示:当施药剂量为5000 g a.i./hm2时,人参和土壤的半衰期分别为6.67、7.14 d;当施药剂量为7500 g a.i./hm2时,人参和土壤的半衰期分别为8.47、6.81 d。[结论]50%辛硫磷乳油在施药剂量为5000～7500 g a.i./hm2时,建议最大残留限量值为0.10 mg/kg,人参的安全间隔期为35 d。[Methods] The degradation of phoxim 50% EC in ginseng and soil clearly was studied. A effective method for the determination of phoxim 50% EC in ginseng and soil using liquid chromatograph mass spectrometry （LC- MS） was established. Moreover, a trial research was conducted in Fusong county, Jilin province. [Results] The average recoveries of the method at three spiking levels （0.01, 0.02, 0.2 mg/kg） were also evaluated. The results showed that recoveries ranged from 86.80-90.40%, 85.10-87.00% with CV of 8.64-10.10%, 6.89-9.73% in P. ginseng and soil respectively. The results of residual decline field trial indicated that when the sprayed dose was 5 000 g a.i./ha, the half- lives of phoxim were 6.67, 7.14 d in P. ginseng and soil respectively. When the sprayed dose was 7500 g a.i./ha, the half-lives of phoxim were 8.47, 6.81 d in P ginseng and soil respectively. [Conclusions] When the sprayed dosage were 5 000-7 500 g a.i./ha, it was recommended that the MRL might be suggested to be 0.10 mg/kg and the preharvest interval was 35 d.

关 键 词：液质联用 辛硫磷 人参 残留 

分 类 号：X839.2[环境科学与工程—环境工程] O657.72[理学—分析化学]