论文部分内容阅读
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。
A method for the determination of dinotefuran residues in paddy field water and soil by HPLC was established and the digestion dynamics of dinotefuran in paddy field and paddy soil in Guangxi, Hunan and Anhui were analyzed by the established method. Paddy water samples were directly analyzed by filtration. The soil was extracted with acetonitrile-water and the extract was analyzed by salting-out to explore the retention behavior of dinotefuran under different chromatographic conditions. The results showed that the separation efficiency of the target peak in the sample was good, the minimum detection limit (LOD) and the minimum detectable concentration (LOQ) were 0.08 ng and 0.05 mg / kg, respectively. The average recovery was 74% -83% (RSD) ranged from 1.6% to 5.9%. The digestion kinetics of dinotefuran in paddy water was in accordance with the first-order kinetic equation with faster digestion and half-lives of 20.5 d (Guangxi), 4.5 d (Hunan) and 3.3 d ). The original deposition in soil was not detected, and no kinetic equation fitting was performed.