农业环境科学学报Issue(3)：431-437,7.DOI:10.11654/jaes.2015.03.004
QuEChERS结合UPLC-ESI-MS/MS分析吡蚜酮和异丙威SC在稻田中的残留特征
Analysis of Residual Profiles of Pymetrozine and Isoprocarb SC in Paddy Field by QuEChERS Combined with UPLC-ESI-MS/MS
摘要
Abstract
In this work, a rapid, accurate and sensitive method for determining the residues of pymetrozine and isoprocarb by UPLC-ESI-MS/MS combined modified-QuEChERS was developed, and was then applied to investigate the residual deposition and persistence of pymetrozine and isoprocarb SC in paddy soils under field conditions. The reliability of the method was evaluated by extracting the pesticide-free paddy samples spiked with authentic pesticides at various concentrations with acetonitrile, and purifying the extracts by salting-out and then analyzing pesticides by UPLC-ESI-MS/MS combined with external standard method. The recovery percentages of the pesticides ranged from 75.2%to 115.9%with the relative standard deviation(RSD)from 2.6%to 19.1%. The limit of quantification(LOQ)of both pesticides was 0.001 mg·kg-1 in paddy field water and 0.005 mg·kg-1 in rice-plant/soil, respectively, indicating that this method could be used to de-termine the trace amount of residual pymetrozine and isoprocarb in paddy field. In the field trial, the degradation curves of the pesticides fit the first-order kinetics. The half-life was 0.7~12.6 days for pymetrozine and 0.4~5.2 days for isoprocarb, suggesting that both pesticides were easily degradable compounds in the environment. In contrast to its WG-formulation, pymetrozine and isoprocarb SC showed relatively high dissipation rates in plant tissue, but relatively low in soil, showing the profound influence of formulation type of pesticides on their per-sistence in the agricultural ecosystem.关键词
吡蚜酮/异丙威/稻田/残留沉积/持留性/超高效液相色谱-电喷雾串联质谱Key words
pymetrozine/isoprocarb/paddy soil/residual deposition/persistence/UPLC-ESI-MS/MS分类
资源环境引用本文复制引用
王全胜,曹梦超,刘雅楠,魏鹏,朱国念,王蒙岑..QuEChERS结合UPLC-ESI-MS/MS分析吡蚜酮和异丙威SC在稻田中的残留特征[J].农业环境科学学报,2015,(3):431-437,7.基金项目
浙江省教育厅科研项目 （）
