砷钼杂多酸-乙基罗丹明B流动注射分光光度法测定地表水中砷(Ⅴ)  

Heteromolybdoarsenic acid-ethyl rhodamine B flow injection spectrophotometric determination of arsenic(Ⅴ) in surface water

作　　者：陈国和[1] 张新申[1] 龚正君[2] 肖新峰[3] 

机构地区：[1]四川大学轻纺与食品学院,四川成都610065 [2]西南交通大学环境科学与工程学院,四川成都610031 [3]山东科技大学工程学院,山东泰安271021

出　　处：《冶金分析》2006年第3期44-46,共3页Metallurgical Analysis

基　　金：国家863项目(2002AA639290)

摘　　要：在0．5mol／L硝酸介质中，砷（Ⅴ）能与钼酸铵形成砷钼杂多酸，在表面活性剂聚乙烯醇（PVA）存在下，砷钼杂多酸可以和乙基罗丹明B（ERB）生成可溶于水的络合物，该络合物在605nm处有最大吸收，据此建立了流动注射分光光度法直接测定地表水中砷（Ⅴ）的方法。砷（Ⅴ）在1．0～100μg／L质量浓度范围内符合比尔定律，检出限为0．1μg／L，平行测定40μg／L砷（Ⅴ）14次，相对标准偏差为3．06％。方法用于实际水样分析，回收率在92．6％～105．1％之间，测定结果与原子吸收光谱法基本一致。It is found that in 0.5 mol/L nitric acid medium arsenic（Ⅴ） reacts with ammonium molybdate to form heteromolybdoarsenic acid,which forms a soluble complex with ethyl rhodamine B in the presence of polyvinyl alcohol（PVA）. The complex has maximum absorption at 605 nm. Beer＇s law is obeyed in the concentration range of 1.0-100μg/L for arsenic（Ⅴ）.Based on this, a new flow injection spectrophotometric method for the determination of trace arsenic in surface water was proposed. The relative standard deviation of 3.06 % was obtained by injecting 40μg/L of As（Ⅴ） standard solution（ n=14）. The detection limit calculated from three times of the average background noise was 0.1μg/L. The recoveries of surface water samples were between 92.6% and 105.1%, and the determination results were in good agreement with those obtained by AAS.

关 键 词：砷 流动注射分光光度法 砷钼杂多酸 乙基罗丹明B 

分 类 号：X832[环境科学与工程—环境工程]