邻羟基苯基重氮氨基偶氮苯分光光度法测定痕量硒  

Spectrophotometric determination of trace selenium with o-hydroxybenzenediazoaminoazobenzene

作　　者：陈文宾[1] 马卫兴[1] 李艳辉[1] 范丽花[1] 

机构地区：[1]淮海工学院化学工程系,江苏连云港222005

出　　处：《冶金分析》2007年第2期57-59,共3页Metallurgical Analysis

基　　金：江苏省高新技术产业化项目(JM01-89);淮海工学院自然科学基金资助项目(Z2004025)

摘　　要：研究了在十二烷基磺酸钠(SDS)存在下,硒(Ⅳ)与邻羟基苯基重氮氨基偶氮苯(o-HDAA)的显色反应条件。试验表明,在pH10.4的硼砂-氢氧化钠缓冲溶液中,硒(Ⅳ)与试剂形成1∶2的红色络合物,络合物的最大吸收峰位于526nm波长处,表观摩尔吸光系数ε为4.9×105L.mol-1.cm-1。25mL溶液中Se(Ⅱ)量在0～3.4μg范围内符合比尔定律。测定了矿泉水及玉带河水中硒的含量与加标回收率,结果满意。The color reaction of the reagent o-hydroxybenzenediazoaminoazobenzene with Se（Ⅳ）in the presence of sodium dodecanesulphonate（SDS）is studied. Results show that the new color reagent reacts with Se（Ⅳ）to form a stable red complex（1 ： 2）in the Na2B4O7-NaOH buffer solution at pH 10.4. The maximum absorption wavelength and apparent molar absorptivity are 526 nm and 4.9 × 10^5L · mol^1 · cm^-1 respectively. Beer＇s law is obeyed in the range of 0-3.4μg/25 mL for Se（Ⅳ）. The method has been applied to the determination of trace amounts of Se（Ⅳ）in mineral water and Yudai river with satisfactory results.

关 键 词：邻羟基苯基重氮氨基偶氮笨 分光光度法 硒 

分 类 号：O657.33[理学—分析化学]