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苯嘧磺草胺在高粱上的残留及消解动态

Residue and dissipation dynamics of saflufenacil in sorghum

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【作者】 张宁赵庆慧程志加郭金博汪庆屹韩笑吕佳旭刘洋侯志广逯忠斌于晓斌

【Author】 ZHANG Ning;ZHAO Qinghui;CHENG Zhijia;GUO Jinbo;WANG Qingyi;HAN Xiao;LYU Jiaxu;LIU Yang;HOU Zhiguang;LU Zhongbin;YU Xiaobin;College of Plant Protection,Jilin Agricultural University;

【通讯作者】 于晓斌;

【机构】 吉林农业大学植物保护学院

【摘要】 [目的]建立了QuEChERS法结合高效液相色谱-串联质谱(HPLC-MS/MS)测定高粱中苯嘧磺草胺残留的检测方法。[方法]高粱植株和籽粒经乙腈-水提取,土壤经乙腈-0.2%甲酸水提取,经PSA、C18、GCB和无水MgSO4净化,采用HPLC-MS/MS测定,外标法定量。[结果]在0.001~0.5 mg/L范围内,苯嘧磺草胺质量浓度与其响应值线性关系良好。添加的质量分数为0.01、0.1、0.5 mg/kg时,苯嘧磺草胺在高粱植株、土壤和籽粒中的平均回收率在85.6%~101.7%之间,相对标准偏差(RSDs)在1.48%~6.28%之间,定量限(LOQ)均为0.01 mg/kg。结果表明,苯嘧磺草胺在内蒙古和吉林2个试验点土壤中的消解动态符合一级反应动力学方程,半衰期分别为3.5、3.7 d;苯嘧磺草胺在高粱植株、土壤和籽粒基质中的最终残留均低于定量限。[结论]70%苯嘧磺草胺水分散粒剂按照推荐剂量施用收获期安全。试验可以为苯嘧磺草胺的安全使用和最大残留限量(MRL)的制定提供参考依据。

【Abstract】 [Aims] A QuEChERS method combined with HPLC-MS/MS was developed for the determination of saflufenacil residues in sorghum. [Methods] Sorghum plants and grains were extracted with acetonitrile and water,and soil was extracted with acetonitrile and 0.2% formic acid water. The extracts were purified by PSA, C18, GCB and anhydrous MgSO4, determined by HPLC-MS/MS, and quantified by external standard method. [Results] In the range of 0.001-0.5 mg/L, the mass concentration of saflufenacil had a good linear relationship with its response value.At the spiked levels of 0.01, 0.1 and 0.5 mg/kg, the average recoveries of saflufenacil in sorghum plant, soil and grain ranged from 85.6%-101.7% with relative standard deviations(RSDs) of 1.48%-6.28%, and the limit of quantitation(LOQ) was 0.01 mg/kg. The results showed that the dissipation dynamics of saflufenacil in the soil of Inner Mongolia and Jilin were in accordance with the first-order reaction kinetic equation and the half-lives were 3.5 and 3.7 d,respectively. The final residues of saflufenacil in sorghum plant, soil and grain matrix were lower than the limit of quantitation. [Conclusions] It is safe to apply saflufenacil 70% water dispersible granules at the recommended dose during the harvest period. This study can provide a reference for the safe use of saflufenacil and the formulation of maximum residue limit(MRL).

【关键词】 苯嘧磺草胺高粱土壤残留消解
【Key words】 saflufenacilsorghumsoilresiduedissipation dynamics
【基金】 农业部行业标准制定嘧菌环胺在人参中的残留限量标准(14202008)项目资助
  • 【分类号】TQ450.2;S481.8
  • 【下载频次】51
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