氢化物—原子荧光光谱法测定轻烧镁中砷和汞  

Determination of Trace Arsenic and Mercury in Calcined Magnesite by Hydride Generation-Atomic Fluorescence Spectrometry

作　　者：胡晓静[1] 蒋维旗[1] 黄大亮[1] 

机构地区：[1]辽宁出入境检验检疫局,辽宁大连116001

出　　处：《中国非金属矿工业导刊》2005年第3期33-34,47,共3页China Non-Metallic Minerals industry

摘　　要：用氢化物-原子荧光光谱法测定轻烧镁中的As和Hg,采用硝酸-盐酸体系消解样品,在0.8mol/L的盐酸介质中,以2%硼氢化钾为还原剂,考查了预还原条件、载气、屏蔽气流速及共存元素干扰的影响。方法的相对标准偏差小于8%,回收率在93.0%～106.0%之间,检出限As为0.54ug/L,Hg为0.06ug/L。A method for determining trace As and Hg in calcined magnesite by hydride generation -atomic fluorescence spectrom- etry was studied. The digestion system of HNO3 -HCl was evaluated. The hydride generation occurred in 0.8mol/L HCl media with 2% KBH4 as a reduction reagent. The experimental conditions of prereduction, flow rate of carrier gas and elemential interferences were investigated. The recoveries are in the range of 93.0% ~ 106.0%, the detection limits are 0.54ug/L for As, 0.06ug/L for Hg, and RSD was below 8%. The method was simple and rapid. The results was satisfied.

关 键 词：氢化物-原子荧光光谱法 轻烧镁 测定 共存元素干扰 相对标准偏差 盐酸介质 硼氢化钾 还原条件 汞 砷 还原剂 回收率 检出限 Hg As 

分 类 号：O657.34[理学—分析化学] TS218[理学—化学]