在线GPC-GC-MS法测定玉米中砜嘧磺隆和莠去津残留

Determination Residues of Rimsulfuron and Atrazine in Maize by GPC-GC-MS

【目的】建立在线GPC—GC—MS测定玉米中砜嘧磺隆和莠去津农药残留的分析方法。【方法】样品经乙腈-水（体积tP,50：50）震荡提取后，Florisil固相萃取小柱净化，采用在线GPC—GC—MS进行测定，以保留时间定性，外标法定量。【结果】在该条件下，砜嘧磺隆和莠去津最小检出质量分数分别为0．05、0．01mg／kg。砜嘧磺隆添加回收率为112．22％~118．04％，相对标准偏差为3．38％-17．01％；莠去津平均回收率为84．36％2-95．98％，相对标准偏差为6．94％-15．37％。【结论】建立了一套快速、灵敏的玉米中砜嘧磺隆和莠去津残留气相色谱-质谱检测方法。

[Aims] An analytical method for the determination of rimsulfuron and atrazine pesticide residues in maize by GPC-GC-MS was established. [Methods] The samples were extracted by acetonitrile ： water （50 ： 50, by vol）, cleaned up by Florisil column, determined by GPC-GC-MS. The retention times were used for qualitative analysis, and the external standard method was used for quantitative analysis. [Results] The minimum determination concentration of rimsulfuron and atrazine was 0.05 and 0.01 mg/kg respectively, the average recovery rate of rimsulfuron was 112.22-118.04% with the relative standard deviation of 3.38-17.01%, the average recovery rate of atrazine was 84.36-95.98% with the relative standard deviation of 6.94-15.37%. [Conclusions] The method was fast, sensitive, which was suitable for detecting the residues of rimsulfuron and atrazine in maize.