【摘要】 为研究乙虫腈对淹水稻田土壤生态环境的安全性,在田间和室内模拟试验条件下,定期取样检测了乙虫腈在土壤和田水中的消解动态。样品采用醋酸-乙腈(1∶99,体积比)提取,经N-丙基乙二胺(PSA)净化,超高效液相色谱-串联质谱(UPLC-MS/MS)检测,外标法(ESTD)定量。结果表明,在0.001～0.1 mg/L质量浓度范围内,乙虫腈的仪器响应值与质量浓度呈良好的线性关系,相关系数均在0.98以上。方法的最小检出量(LOD)为2.2×10-13 g,乙虫腈在稻田土壤和田水中的最低检测浓度(LOQ)为0.001 mg/kg(L)。当土壤中的添加水平为0.002～1.0 mg/kg时,回收率在80.2%～119.5%之间,相对标准偏差(RSD)最大为9.0%;田水中的添加水平为0.001～1.0 mg/L时,回收率在94.2%～108.2%之间,RSD最大为13.2%。消解动态试验结果表明,乙虫腈在水稻土壤和田水样品中的消解均符合一级动力学方程,其在室内外水稻土壤及田水中消解迅速,半衰期分别为3.2～2.8 d和3.5～1.8 d,属于易降解性农药。更多还原

【Abstract】 In order to study the safety of ethiprole to paddy soil ecosystem,residue decline of ethiprole in soil and water were investigated under field and field-simulated condition.The samples were extracted by acetic-acetonitrile(1∶99,V∶ V),cleaned up with primary secondary amine(PSA),and analyzed by UPLC-MS/MS.External reference method was used for quantitative determination.The linearity was satisfied(r>0.98) in the concentration range of 0.001-0.1 mg/L.The limit of detection(LOD) was 2.2×10-13 g,and the limit of quantification(LOQ) in paddy soil and water were 0.001 mg/kg(L).The average fortification recoveries varied from 80.2% to 119.5% with relative standard deviation(RSD) of 3.1%-9.0% when ethiprole was spiked at 0.002-1.0 mg/kg level in soil matrix,the average fortification recoveries varied from 94.2%-108.2% with relative standard deviation(RSD) of 1.6%-13.2% when ethiprole was spiked at 0.001-1.0 mg/L level in water matrix.The decline study of ethiprole residue in paddy field soil and water were carried out,the decline curves accorded with the first-order kinetics equation,and the half-lives of ethiprole in soil and water under field-simulated and field condition were of 3.2-2.8 d and 3.5-1.8 d,respectively.Ethiprole belongs to the easily degradable pesticide.更多还原