不同分析方法测定土壤样品中汞含量的比较

Comparison of the Analytical Methods in Determination of Total Mercury in Topsoil

利用国家标准土壤物质,对比研究了三种国家标准分析方法 HJ680-2013、GB/T22105.1-2008和GB/T17136-1997测定土壤中汞的差异。结果表明,三种方法的检出限、精密度和准确度均满足土壤测定的要求。从精密度分析,冷原子吸收分光光度法比原子荧光法具有更高的精密度,而同样用原子荧光测定土壤中的汞,微波消解比沸水浴消解具有更好的精密度;从准确度分析,冷原子吸收分光光度法测定GSS-1、GSS-6中汞更接近认定值,而测定GSS-18、GSS-27中汞,原子荧光法更接近认定值。

With the national standard soil sample, three methods of measuring total mercury in soil were compared. The detection limit, precision and accuracy of the three methods met the requirements of the determination of soil. The cold atomic absorption spectrophotometry method had better precision than atomic fluorescence spectrometry. With the atomic fluorescence spectrometry, microwave digestion had better precision than boiling water bath digestion. Determination of mercury in GSS-1 and GSS-6 by cold atomic absorption spectrophotometry had better accuracy, and GSS-18 and GSS-27 is suitable for Atomic Fluorescence Spectrometry.