王水回流消解同时测定土壤/沉积物中汞、砷和镉的方法研究

摘要

通过王水回流消解土壤/沉积物样品,利用原子荧光和石墨炉原子吸收分别测定土壤/沉积物中的汞、砷和镉.使用该方法分析了8种土壤/沉积物标准物质中的汞、砷和镉,结果表明,其测定值均在参考范围以内.汞、砷和镉的相对标准偏差分别为2.9％～8.2％、1.2％～5.6％和3.4％～6.8％,其检出限、精密度和准确度均满足土壤分析方法的要求.%Hg, As and Cd in soil/sediment samples were determined with the refluxing digestion of aqua regia. Cd was determined by Graphite Furnace Atomic Absorption Spectrometry. Hg and As were determined by Atomic Fluorescence Spectrometry. 8 geochemical standard reference material of soil/sediment were tested. The test data showed that the determination of standard reference material were within the reference range. The relative standard deviation of Hg, As and Cd were 2.9％～8.2％,1.2％～5.6％ and 3.4％～6.8％. The detection limit, precision and accuracy of the methods met the requirements of the determination of soil.