【摘要】 建立了以OP乳化剂,正丁醇、正庚烷、水组成的微乳液介质萃取测定重金属钴的新方法。在pH为4.6的乙酸-乙酸钠缓冲溶液中,2-[（5-溴-2-吡啶）-偶氮]-5-二乙氨基苯酚（5-Br-PADAP）与钴离子发生络合反应,微乳液析相后,可显著提高灵敏度。其最大吸收波长为588 nm,表观摩尔吸收系数达3.75×105L·mol-1·cm-1。钴离子浓度在0.008⁰.4 mg/L范围内符合比尔定律,RSD为0.50%,检出限为1.66×10-4mg/L。本方法选择性好,操作简单,精密度高,常见共存成分对测定无干扰。方法用于地表水、污水中Co²⁺测定,加标回收率介于98%¹03%之间,结果令人满意。更多还原

【Abstract】 A newmethod for the extraction of heavy metal cobalt by microemulsion medium composed of OP emulsifier,n-butanol,heptane and water was developed. In pH 4. 6 acetic acid sodium acetate buffer solution,2-[（ 5-bromide-2-pyridine）-azo]-5-two aminophenol（ 5-Br-PADAP） react with Co²⁺,after microemulsion phase separation,the sensitivity could be improved significantly. At maximum absorption wavelength of 588 nm,and the apparent molar absorption coefficient was 3. 75 × 105 L·mol-1·cm-1. Beer’Cos lawwas obeyed at 0. 008 0. 4 μg/m L for Co²⁺,the relative standard deviation was 0. 50%,and the detection limit was 1. 66 × 10-4 mg/L. The method has the advantages of good selectivity,simple operation and high precision,and the common coexisting components have no interference to the determination. The method was applied to the determination of Co²⁺in surface water and wastewater. And the standard sample recovery rate was 98. 0% 103%,the result is statisfying.更多还原