食品科学2018，Vol.39Issue(8)：262-266,5.DOI:10.7506/spkx1002-6630-201808041
黄瓜和土壤中吡唑醚菌酯和霜脲氰同步检测及其降解分析
Simultaneous Detection and Degradation of Pyraclostrobin and Cymoxanil in Cucumber and Soil
摘要
Abstract
In this paper, a method for the simultaneous detection of pyraclostrobin and cymoxanil in cucumber and soil was developed using the quick, easy, cheap, effective, rugged and safe (QuEChERS) method coupled with high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The degradation kinetics and the final residue of pyraclostrobin-cymoxanil water dispersible granule in cucumber and soil were studied, aiming to evaluate the safety of this pesticide combination. Samples were extracted with acetonitrile and the extract was cleaned up with primary secondary amine (PSA) and C18before being analyzed by mass spectrometry in the multiple-reaction monitoring (MRM) mode. There was a good linear relationship within the concentration range of 50-800 μg/L with correlation coefficients (R2) greater than 0.996 1. The average recoveries of two pesticides in cucumber and soil were 70.45%-107.08% at three spiked concentrations. The limit of quantification (LOQ) was 0.050 mg/kg for both. Two-year field experiments at three different locations showed that the residual concentrations of pyraclostrobin and cymoxanil were lower than the LOQ after 1 and 7 d, and 7 and 1 d after being applied at the high recommended 1.5-fold dose to cucumber and soil, respectively. When applied at the recommended dose 3 times to cucumber with a 7 d interval between each dose, the maximum residual concentrations of pyraclostrobin and cymoxanil were 0.090 and 0.060 mg/kg, respectively, which were lower than China's maximum residue limits (MRL) for pyraclostrobin and cymoxanil in cucumber (0.5 mg/kg). The recommended safe pre-harvest interval was 3 d.关键词
吡唑醚菌酯/霜脲氰/黄瓜/土壤/QuEChERS/高效液相色谱-串联质谱法/残留/消解动态Key words
pyraclostrobin/cymoxanil/cucumber/soil/QuEChERS/high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS)/residue/dissipation分类
轻工纺织引用本文复制引用
洪思慧,劳水兵,闫飞燕,王静,佘永新,张超,曹晓林,郑鹭飞,王珊珊,金茂俊,邵华,金芬..黄瓜和土壤中吡唑醚菌酯和霜脲氰同步检测及其降解分析[J].食品科学,2018,39(8):262-266,5.基金项目
国家大麦青稞产业技术体系建设专项(CARS-05-06B) （CARS-05-06B）
国家自然科学基金面上项目(31772071 （）
31471654) （）
广西创新驱动发展专项资金项目(桂科AA17204043-2) （桂科AA17204043-2）
