高效液相色谱法测定沉积物中噻虫嗪的残留量

为了检测沉积物中的噻虫嗪的残留量,建立高效液相色谱法测定噻虫嗪的含量。结果表明:在0.05~100 mg/L范围内具有良好的线性关系,回归方程为:y=48 330 x,相关系数r=0.9 998。当添加浓度分别为0.1、1.0和2.0 mg/kg,噻虫嗪在2种来源不同沉积物中的添加平均回收率分别为83.4%~91.0%和89.2%~96.1%,RSD分别为1.4%~3.1%和1.7%~5.7%。方法的准确度和精密度均满足农药残留分析的要求,方法最小检出量为5.0×10-10g,沉积物中的最小检出浓度(LOQ)为0.1 mg/kg。该方法操作简单可靠,准确度、精密度及其灵敏度均满足农药残留分析的要求,可用于沉积物中噻虫嗪残留量的测定。

Determination of Thiamethoxam Residue in Sediment By HPLC

In order to determinate the thiamethoxam residue in sediment, an analyzing method was established by high performance liquid chromatography. The results showed that a good linear was obtained between 0.05-100 μg/L with the regression equation y=48 330 x and the correlation coefficient r=0.999 8. Respectively, when the additive concentrations were 0. 1,1.0 and 2. 0 mg/kg, the average additive recovery rates of thiamethoxam in two sediments from different sources were 83.4 %-91.0 % and 89.2 %-96. 1%,and the RSD were 1.4 %- 3.1% and 1.7 % - 5.7 %. The limit of detection of thiamethoxam was 5× 10-10 g, and the limit of quantification was 0. 1 mg/kg. Accuracy, precision and sensitivity were satisfied with the requirements of pesticide residues analy- sis. The method was simple and reliable for application to determining thiamethoxam residue in sediment.