氢化物发生结合电感耦合等离子体原子发射光谱法测定天然水样中Sb(Ⅲ)和Sb(Ⅴ)  

HG-ICP-AES DETERMINATION OF ANTIMONY(Ⅲ,Ⅴ) IN NATURAL WATER

作　　者：季海冰[1] 赵承易[1] 何孟常[2] 

机构地区：[1]北京师范大学分析测试中心 [2]北京师范大学环境科学研究所,北京100875

出　　处：《理化检验（化学分册）》2004年第7期410-412,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家自然科学基金资助项目(29977002)

摘　　要：提出了氢化物发生结合电感耦合等离子体 原子发射光谱法(HG ICP AES)测定河水和土壤提取液中Sb(Ⅲ)和Sb(Ⅴ)的方法,在pH4.5～5.5的HOAc NaOAc介质中,Sb(Ⅲ)与NaBH4反应生成SbH3,而Sb(Ⅴ)不与NaBH4反应,这样可测出Sb(Ⅲ);而在3.0mol·L-1HCl中,用KI还原Sb(Ⅴ)为Sb(Ⅲ),可测定总锑量。差减法得Sb(Ⅴ)。该方法的Sb(Ⅲ)和总锑检出限分别为0.30和0.63ng·ml-1,河水和土壤提取液的回收率为90%～100%,证明其适用于天然水样中Sb(Ⅲ)和Sb(Ⅴ)的检测。In an acetate buffer solution of pH 4.5～5.5, tervalent antimony is separated from natural water sample as SbH_3 by its reaction with sodium borohydride (NaBH_4), while pentavalent antimony is not reacted. The antimony(Ⅲ) as SbH_3 is then determined by ICP-AES. The pentavalent antimony in the sample is first reduced to trivalent state by KI in 3.0mol·L^(-1) HCl solution, and the total antimony is then determined by HG-ICP-AES method. The content of Sb(Ⅴ) is found by difference. The detection limits of Sb(Ⅲ) and of total antimony were found to be 0.3ng·ml^(-1) and 0.63ng·ml^(-1) respectively. In its application to the determination of antimony (Ⅲ and Ⅴ) in river water and in soil extract, recoveries in the range from 90% to 100% were obtained.

关 键 词：电感耦合等离子体-原子发射光谱法 氢化法 Sb(Ⅲ) Sb(Ⅴ) 天然水 

分 类 号：O657.31[理学—分析化学]