氢化物发生-原子荧光光谱法同时测定地球化学样品中的砷和汞  

Simultaneous determination of arsenic and mercury in geochemical samples by hydride generation-atomic fluorescence spectrometry

作　　者：张元 张兵兵 孙彦峰 姜楠 赵文志 韩晨灏 ZHANG Yuan;ZHANG Bing-bing;SUN Yan-feng;JIANG Nan;ZHAO Wen-zhi;HAN Chen-hao(Analysis and Testing Laboratory of Harbin Natural Resources Comprehensive Survey Center,China Geological Survey,Harbin 150086,China)

机构地区：[1]中国地质调查局哈尔滨自然资源综合调查中心分析测试实验室,黑龙江哈尔滨150086

出　　处：《现代化工》2021年第4期229-233,共5页Modern Chemical Industry

基　　金：中国地质调查局项目(DD20191014)。

摘　　要：利用全自动石墨消解仪,以50%王水消解样品,在5%盐酸介质中用0.8%硼氢化钾(含0.2%的氢氧化钾)作为还原剂,采用氢化物发生-原子荧光光度法(HG-AFS)对地球化学样品中的砷、汞2种元素同时进行测定。结果表明,该方法砷和汞的检出限分别为0.0068、0.0043μg/g,砷和汞的相对标准偏差(RSD%,n=12)分别为0.43%~4.05%、2.98%~7.88%,均小于10%。该方法结果准确,操作简便、快速,应用成本低,精密度和准确度均满足地质实验室质量管理规范要求(DZ/T 0130—2006),可广泛应用到测定地质样品中砷、汞的实际工作中。The samples are digested with 50%aqua regia in a fully automatic graphite digestion meter.Arsenic and mercury in geochemical samples are simultaneously determined by hydride generation-atomic fluorescence spectrometry(HG-AFS)method using 0.8%potassium borohydride(containing 0.2%potassium hydroxide)in 5%hydrochloric acid medium as a reductant.Determination results show that the detection limits for arsenic and mercury by this method are 0.0068μg·g-1 and 0.0043μg·g-1,respectively,and the relative standard deviations(RSD%,n=12)for arsenic and mercury are 0.43%-4.05%and 2.98%-7.88%,respectively,both less than 10%.This method can offer accurate results,and is easy to operate rapidly at a low application cost,with precision and accuracy meeting the requirements of China's quality management standard of geological laboratory(DZ/T 0130—2006).It can be widely used in the actual determination of arsenic and mercury in geological samples.

关 键 词：全自动石墨消解 氢化物发生-原子荧光光度法(HG-AFS) 砷 汞 

分 类 号：O657.31[理学—分析化学]