高效液相色谱检测呋虫胺在稻田水和土壤中的残留及消解动态

建立了高效液相色谱检测呋虫胺在稻田水和土壤中残留量的方法,并采用所建方法分析了广西、湖南和安徽3地稻田水和土壤中呋虫胺的消解动态。稻田水样经过滤后直接分析;土壤用乙腈-水提取,提取液经盐析检测,探索在不同色谱条件下呋虫胺的保留行为。结果表明:样品中目标峰的分离效果好,方法的最小检出量(LOD)为0.08 ng,最低检出浓度(LOQ)为0.05 mg/kg,平均回收率为74%~83%,相对标准偏差(RSD)为1.6%~5.9%;呋虫胺在稻田水中的消解动态符合一级动力学方程,消解较快,半衰期分别为20.5 d(广西)、4.5 d(湖南)和3.3 d(安徽);其在土壤中的原始沉积量未检出,未进行动力学方程拟合。

Residue and decline study of dinotefuran in paddy water and soil by high performance liquid chromatographic

A method of residue detection of dinotefuran in paddy water and soil by high performance liquid chromatographic (HPLC) was established and applied in the analysis of samples from Guangxi, Hunan and Anhui. Paddy water was filtrated by double filters and soil samples were extracted with acetonitrile-water, and the retention of dinotefuran in different chromatographic conditions was studied. The results showed that the excellent separation was obtained and the limit of detection (LOD) was 0.08 ng and the limit of quantification (LOQ) was 0.05 mg/kg. The range of average recovery was 74% to 83% and the relative standard deviations (RSD) was 1.6% to 5.9%. The dissipation dynamics of dinotefuran in paddy water accorded with the first-order kinetics equation, the half-life was 20.5 d(Guangxi), 4.5 d (Hunan) and 3.3 d (Anhui) . The original deposition was not detected in soil and the kinetic equation was not simulated.