共沉淀分离-氢化物发生-原子荧光光谱法测定高纯偏钨酸铵中痕量铋  

Determination of bismuth in high purity ammonium paratungstate by coprecipitation-hydride generation-atomic fluorescence spectrometry

作　　者：张殿凯[1] 郑永章[1] 臧慕文[1] 童坚[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《分析试验室》2010年第12期70-72,共3页Chinese Journal of Analysis Laboratory

摘　　要：提出了以氢氧化镧为共沉淀剂,对高纯偏钨酸铵中痕量杂质元素铋进行共沉淀分离富集后以HG-AFS进行测定的方法。在强碱性环境中进行两次共沉淀,能使铋元素定量分离回收,偏钨酸铵残留量降至很低水平。选择了适宜的反应条件以及仪器的最佳工作条件,考察了钨基体对被测元素的干扰。铋的检出限0.020 ng/mL,测定下限0.012μg/g,相对标准偏差4.6%,回收率在92.8%-108.4%之间,方法适用于高纯偏钨酸铵中痕量铋的测定。A method for the determination of bismuth in high purity ammonium paratungstate by coprecipitation-hydride generation-atomic fluorescence spectrometry has been proposed.Coprecipitation of bismuth with lanthanum hydroxide was to be separated and concentrated.It was found that the bismuth could be recovered after two times of coprecipitation.The optimum experimental parameters,and the effect of coexistent elements on the determination of bismuth were investigated.The detection limit and determination limit of Bi were 0.020ng/mL and 0.012 μg/g respectively.The recoveries were 92.8%～108.4% and the RSD was 4.6%.The method can be applied to analyzing the trace bismuth in high purity ammonium paratungstate.

关 键 词：共沉淀 氢化物发生 原子荧光光谱法 偏钨酸铵 铋 

分 类 号：O657.32[理学—分析化学]