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.
出处
《冶金分析》
CAS
CSCD
北大核心
2006年第3期44-46,共3页
Metallurgical Analysis
基金
国家863项目(2002AA639290)
关键词
砷
流动注射分光光度法
砷钼杂多酸
乙基罗丹明B
arsenic
flow injection spectrophotometry
heteromolybdoarsenic acid
ethyl rhodamine B
作者简介
陈国和（1974-），男，在读博士，研究方向为现代分离分析技术
通讯联系人：张新申，男，教授，博士生导师，Tel：028-85407553，E-mail：zhangxinshen@126．com。
