邻羧基苯基重氮氨基偶氮苯胶束水相分光光度测定痕量铊

• 作 者: 郭忠先 蔡蜀穗 郑国祥 张淑云
• 机 构: 四川轻化工学院化学工程系
• 出 处: 化学试剂
• 发表日期: 1997年06期
• 关键词: 偶氮苯 重氮 分光光度测定 显色反应 分光光度法 摩尔吸收系数 乳化剂 吸光度 平衡移动法 试剂空白

在乳化剂ＯＰ存在下，于１．１～３．０ｍｏｌ／Ｌ氨水介质中，铊（Ⅲ）与邻羧基苯基重氮氨基偶氮苯（ＣＤＡＡ）形成组成比为１２的稳定的橙红色配合物，其吸收峰波长在５１２ｎｍ，对比度Δλ＝９２ｎｍ，表观摩尔吸收系数为１．３４×１０５Ｌｍｏｌ－１ｃｍ－１，室温下显色反应立即完成，配合物至少稳定８ｈ，线性范围是０～０．８０μｇ／ｍＬ铊。方法用于水样、烟叶和煤灰中痕量铊的分析，回收率为９０．０％～１０１．４％，５次测定的相对标准偏差不大于４．６％。

In the presence of emulsifier OP, thallium (III) and o-carboxyphenyldiazoaminoazobenzene (CDAA) form a stable orange-red complex with a composition ratio of 12 in a 1.1-3.0 mol / L aqueous ammonia solution The apparent absorption coefficient was 1.34 × 105 Lmol-1cm-1. The color reaction was completed immediately at room temperature. The complex was stable at least for 8h with a linear range of 0 ~ 0 .80 μg / mL thallium. The method was applied to the determination of trace thallium in water samples, tobacco leaves and coal ash. The recoveries ranged from 90.0% to 101.4%. The relative standard deviations of the five determinations were no more than 4.6%.