钴-4-(5-氯-2-吡啶偶氮)-1,3-二氨基苯-Triton X-100体系的析相富集及痕量钴的光度测定

• 作 者: 汤桂娜 于薇 王保宁
• 机 构: 中国科学院长春应用化学研究所,中国科学院长春应用化学研究所,中国科学院长春应用化学研究所 长春 130022,长春 130022 中国科学院长春光学精密机械研究所,长春 130022
• 出 处: 分析化学
• 发表日期: 1993年05期
• 关键词: 吡啶偶氮 二氨基苯 Triton X-100 析相法 表面活性剂 络合物 分光光度法 胶束溶液 浊点 比尔定律

本文研究了TritonX-100在浊点条件下对钴-4-(5-氯-2-吡啶偶氮)-1,3-二氨基苯(5-Cl-PADAB)络合物的析相条件,在pH4.0～6.0介质中,将胶束溶液加热到92±1℃,保持40min,络合物即被TritonX-100相富集。富集液在575nm测定吸光度,钴含量在0～4μg/5ml范围内服从比尔定律,干扰离子可在TritonX-100析相液中加入H_2SO_4消除。拟定的方法灵敏、简捷,已用于不经分离直接测定人发及自来水中痕量钴。

In this paper, the separation conditions of cobalt-4- (5-chloro-2-pyridylazo) -1,3-diaminobenzene (5-Cl-PADAB) complex under Triton X- In pH4.0 ~ 6.0 medium, the micellar solution was heated to 92 ± 1 ℃ for 40min, the complex was TritonX-100 phase enrichment. Absorbance was measured at 575 nm for the enrichment solution. Beer ’s law was obeyed in the range of 0 ~ 4 μg / 5 ml. The interference ions could be eliminated by adding H_2SO_4 to TritonX - 100. The proposed method is sensitive, simple and has been used for the direct determination of trace amounts of cobalt in human hair and tap water without isolation.