海洋沉积物中汞的分析方法研究

Study on Analytical Method for Mercury in Marine Sediment

本文介绍了冷原子荧光法测定海洋沉积物中汞的分析方法。试样用王水 (1+1)在沸水浴上分解 ,氯化亚锡还原 ,冷原子荧光法测定。本法大大降低了共存元素对汞的测定干扰 ,不需加高锰酸钾及草酸 ,使操作更加简单、快速 ,方法精密度好、准确度高。经对海洋沉积物国家一级标准物质 GBW0 7314、GBW0 7315、GBW0 7316进行测定 ,其结果准确可靠。并对 GBW0 7315进行了 12次测定 ,相对标准偏差为 2 .2 1%。不同实验室用本法测定海底沉积物样品中 Hg,均获得了满意的结果。

A method to determine Hg in marine sediment is proposed in this paper.The samples are firstly digested in aqua regia(1+1), then reduced by SnCl 2,and the Hg content in the solution is determined directly by cold vapour atomic fluoresecence method.This method is simple,rapid,accurate and precise, without potassium permanganate and oxalic acid in the solution.The merit of this method is that it greatly decreases interferences of the coexist elements for the determination of Hg.The results agree well with the recommended values of the different standard materials of geology (GBW 07314, GBW 07315,GBW 07316),with the RSD<2.21%(n=12) for the marine sediment reference(GBW 07315).In addition,this method is satisfactorily applied to determination of Hg in marine sediment between laboratories.