沉积物中砷、汞测定新方法的实验条件分析与研究

Study and analysis of new measuring method of arsenic and mercury in sediment

本文对微波消解沉积物样品中砷、汞的条件进行了优化实验,并对海河流域漳卫南运河沿岸的25个沉积物样品进行了测定,结果令人满意。本次实验条件的优化为下一阶段的全国沉积物污染情况调查奠定了基础。在优化的实验条件下,采用原子荧光光谱测定砷和汞的检出限分别为0 01μg L和0 001μg L,线性范围分别为0～100μg L和0～50μg L,两元素的回收率在90%～104%之间,相对标准偏差分别为2 88%和5 71%。

In this paper, an optimum experiment was presented to determine arsenic (As) and mercury(Hg)in sediment by microwave digestion and atomic fluorescence spectrometry. A measurement of 25 samples from sediment in the Zhangweinan River was carried out with satisfactory results. The optimum experiment laid a foundation for investigation of sediment contamination in the whole country. The limits of detection were 0.04μg/L for As and 0.001μg/L for Hg. The relationship between the fluorescence intensity and concentration of As and Hg was linear in the ranges of 0～100μg/L and 0～50μg/L respectively. The recovery rate of the 2 elements from results of the standard soil sample was 90% to 104% respectively, and the Relative Standard Difference (RSD) was 2.88% and 5.71% for As and Hg, respectively.