广西北部湾地区大气颗粒物中总汞的测定

Determination of Total Mercury in Particulates of Guangxi Northern Bay

建立了采用自制的石英管加热处理样品,高锰酸钾溶液吸收释放的Hg0,盐酸羟胺还原过量的高锰酸钾后直接用HG-AFS测定广西北部湾地大气颗粒物中总汞的方法。结果表明,广西北部湾地区主要城市南宁、钦州、防城港和北海大气颗粒物中总汞的日平均浓度分别为0.49、0.43、0.52和0.43 ng/m3,远低于我国《居住区大气中有害物质的最高容许量》(TJ36-79)。该方法样品处理无需湿法消解,方法简便、快速,具有较低的检出限和较好的精密度,适合大气颗粒物中总汞的检测分析,可为汞污染控制提供可靠的数据。

A detection method for total mercury in particulates of Guangxi Northern Bay was established.The samples were heated inside a self-made quartz tube,the released Hg0 was absorbed by potassium permanganate solution and the superfluous potassium permanganate was reduced by hydroxylamine hydrochloride solution afterwards,then total mercury was determined by HG-AFS directly.Experimental results indicated that total mercury concentrations in TSP of Nanning,Qinzhou,Fangchenggang and Beihai,Guangxi Prefecture were 0.49,0.43,0.52 and 0.43 ng/m3 on daily basis respectively,which were far below those authorized in Chinese standards for residential areas of TJ36-79.With the merit of samples not requiring wet digestion,the new method which is fast,simple and convenient with lower limit of detection and better precision is suitable for determination of total mercury in particulates,and could offer reliable data for mercury pollution control.