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[目的]建立水环境中农药多残留的快速分析技术,为农药水生生态风险评价提供技术支撑。[方法]采用固相萃取-气相色谱-质谱联用方法分析地表水中10种高风险稻田农药(毒死蜱、硫丹、灭多威、莠去津、烟嘧磺隆、氟乐灵、百菌清、苯醚甲环唑、二嗪磷、氯氰菊酯等)的残留状况,对比固相萃取小柱、洗脱溶剂等因素对回收效率的影响。[结果]采用500 mg的HLB小柱、丙酮-乙酸乙酯-二氯甲烷(体积比1∶1∶1)作为洗脱溶剂,GC/MS(SIM模式)测定地表水中10种农药,最低检出限(LOD)在0.005~0.1μg/L,方法回收率在79%~116%。采用该方法验证PRAESS稻田-地表水模型及场景,测试质量浓度(1.83μg/L)与模型预测质量浓度(2.32μg/L)有较高的拟合水平,后期测试质量浓度与模型估算值有较大差异。[结论]多残留分析技术简便易行,PREASS模型仍有待于进一步修正和完善。
[Objective] The research aimed to establish a rapid analytical technique for pesticide residues in aquatic environment and provide technical support for pesticide ecological risk assessment. [Method] Ten high-risk paddy pesticides (chlorpyrifos, endosulfan, methomyl, atrazine, nicosulfuron, triflumuron, chlorothalonil and chlorothalonil) in surface water were analyzed by solid-phase extraction coupled with gas chromatography- , Difenoconazole, diazinon, cypermethrin, etc.), compared with solid phase extraction cartridge, elution solvent and other factors on the recovery efficiency. [Result] Ten pesticides in surface water were determined by GC / MS (SIM mode) using 500 mg HLB cartridge, acetone - ethyl acetate - dichloromethane (1: 1: 1 by volume) The limit of detection (LOD) was 0.005-0.1 μg / L, and the recovery rate was between 79% and 116%. This method was used to validate the PRAESS paddy-surface water model and scenario. The test concentration (1.83μg / L) and the model predictive concentration (2.32μg / L) had higher fitting levels. The post-test concentration and model estimation Big difference. [Conclusion] The multi-residue analysis technique is simple and easy to implement, and the PREASS model still needs to be further amended and improved.