氨氯吡啶酸在小麦、植株和土壤中的消解和残留

Study on the Residue and Degradation of Picloram in Wheat, Plant and Soil

建立了小麦、植株和土壤中氨氯吡啶酸残留的高效液相色谱串联质谱检测方法。样品经乙腈+水(体积比1∶1)提取,石墨化炭黑QuEChERS法净化,研究了小麦、植株和土壤中氨氯吡啶酸的残留消解动态。实验结果表明,氨氯吡啶酸在小麦、植株和土壤中的添加回收率为73%～92%,相对标准偏差(RSD)均小于11.2%,土壤和植株中的氨氯吡啶酸最低检测浓度为50μg/kg,小麦中氨氯吡啶酸的最低检出浓度为100μg/kg,符合残留试验要求。氨氯吡啶酸在植株和土壤中的消解符合一级动力学方程,半衰期分别为4.9～15.6 d和10.5～18.6 d。

An analytical method used HPLC-MS/MS was developed for determining picloram in wheat, plant and soil. The samples were extracted by acetonitrile, cleaned up with Bond Elut Carbon QuEChERS. The results of analytical experiment showed that recovery rates of the analytical method were 73%-92%, relative standard deviations (RSD) were all below 11.2%,limits of quantification (LOQ) in wheat , plant and soil were 50 μg/kg, 50 μg/kg and 100 μg/kg respectively, which were all meet the requirement. The average degration half-lives of picloram were 2.9-15.6 d in wheat plant, 10.5-18.6 d in soil, respestively.