2-[2-(6-氯苯并噻唑)偶氮]-5-二乙氨基苯甲酸与镍的显色反应  

Chromogenic Reaction of 2-[2-(6-chlorobenzothiazolyl)azo]- 5-diethylamino Benzoic Acid with Nickel

作　　者：樊学忠[1] 张国防[2] 范红杰[3] 

机构地区：[1]西北大学化学系陕西省物理无机化学重点实验室,陕西西安710069 [2]陕西师范大学化学与材料科学学院,陕西西安710062 [3]西安近代化学研究所,陕西西安710065

出　　处：《岩矿测试》2004年第1期40-43,共4页Rock and Mineral Analysis

基　　金：西安近代化学研究所科研资助课题(03210-1)

摘　　要：研究了2-[2-(6-氯苯并噻唑)偶氮]-5-二乙氨基苯甲酸(6-Cl-BTAEB)与Ni2+的显色反应。结果表明:在pH4.5～7.6的HAc-NaAc缓冲溶液中及十二烷基硫酸钠存在下,试剂与Ni2+形成稳定的蓝紫色配合物,组成为n(Ni2+)∶n(6-Cl-BTAEB)=1∶2,最大吸收波长650nm,表观摩尔吸光系数为1.59×105L·mol-1·cm-1,Ni2+浓度在0～400μg/L内符合比尔定律。用铝合金和合金钢中的微量镍验证该分析方法,所得结果与推荐值相符,6次测定的RSD<2%。The chromogenic reaction of 2-\[2-(6-chlorobenzothiazolyl)azo\]-5-diethylamino benzoic acid(6-Cl-BTAEB) with nickel has been studied in detail. In the presence of sodium dodecylsulfate (SDS), nickel (Ⅱ) reacts with 6-Cl-BTAEB in a buffer solution of pH 4.5～7.6 HAc-NaAc and forms a stable 1∶2 complex with blue-violent color. The absorption maximum of the complex lies at 650 nm with an apparent molar absorptivity of 1.59×10^(5 )L·mol^(-1)·cm^(-1). Beer′s law is obeyed in the range of 0～400 μg/L for Ni^(2+). The proposed method has been applied to the direct determination of nickel in aluminum alloys and alloy steel. The results are in (agreement) with the certified values with precision of RSD<2% (n= 6).

关 键 词：2-[2-(6-氯苯并噻唑)偶氮]-5-二乙氨基苯甲酸 分光光度法 镍 

分 类 号：O614.813[理学—无机化学] O657.32[理学—化学] O626.25