摘要
本文研究了在Ｃｌ￣－和Ｉ￣－的混合物中，加入过量Ａｇ￣＋使Ｃｌ￣－和Ｉ￣－分别以ＡｇＣｌ和ＡｇＩ沉淀后，用ＩＣＰ－ＡＥＳ测定剩余的Ａｇ￣＋，然后用ＮＨ＿３·Ｈ＿２Ｏ溶解ＡｇＣｌ沉淀，测定溶解液中的Ａｇ￣＋，间接得到Ｃｌ￣－的含量，以差减法求得Ｉ￣－量，实现Ｃｌ￣－和Ｉ￣－的间接法连续测定。本文探讨了有关的化学条件和光谱测定条件，对方法的适用性进行了考察──共存离子的干扰情况，方法的精密度、检出限和试样中加入回收试验。回收率为９７．１％～１０１．２％（Ｃｌ￣－），９８．１％～１００．４％（Ｉ￣－）。
A new method for the indirect continuousdetermination of Cl￣- and I￣- in a mixture is de-scribed. The method is based on that silver ioncan react with Cl￣- and I￣- to form the precipi-tates AgCl and AgI, the gross amount of Cl￣-and I￣- can be got by measurement of uncon-sumed Ag￣+ by ICP-AES. The precipitate AgClis subsequently dissolved with ammonia forthe indirect determination of Cl￣-, I￣- is ob-tained by difference. The experimental condi-tions were optimized. The feasibility of themethod was studied, including interferences ofco-existing ions, relative standard deviation,detection limits and recovery rate of samples.The recoveries are 97.1%～101.2% for Cl￣-and 98.1%～100.4% for I￣-. The method alsoallows simultaneous determination of othermetal elements.
出处
《分析试验室》
CAS
CSCD
北大核心
1996年第3期68-71,共4页
Chinese Journal of Analysis Laboratory
关键词
氯
碘
ICP-AES
水样
Chloride and Iodide determi-nation
ICP-AES
Water sample
