摘要
该文研究了新显色剂２－［２－（６－甲基苯并塞唑）偶氮］－５－二乙氨基苯甲酸（６－Ｍｅ－ＢＴＡＥＢ）的酸碱平衡及其与镍（Ⅱ）的显色反应。实验结果表明，在十二烷基硫酸钠（ＳＤＳ）存在下，６－Ｍｅ－ＢＴＡＥＢ与镍（Ⅱ）在ｐＨ４．５～８．３缓冲溶液中形成稳定的蓝紫色络合物，其组成为Ｎｉ（Ⅱ）∶６－Ｍｅ－ＢＴＡＥＢ＝１∶２，最大吸收波长为６５０ｎｍ，表现摩尔吸光系数为１．６７×１０５Ｌ·ｍｏｌ－１·ｃｍ－１镍（Ⅱ）浓度在０～１０μｍ／２５ｍｌ范围内服从比尔定律。方法可直接用于铝合金中微量镍的测定，结果满意。
The acid-base equilibrium of a new chromogenic reagent, 2-[2-(6-methylbenzothiazolyl)azo]-5-diethylaminobenzoic acid (6-Me-BTAEB) was studied. In the medium of pH 4.5～8.3, 6-Me-BTAEB reacts with Ni(Ⅱ) to form a stable 2∶1 complex of blue-violet colour in the presence of sodium dodecyl sulfate. The absorption maximum of this complex lies at 650nm with an apparent molar absorptivity of 1.67×10 5 L·mol -1 ·cm -1 . Beer′s law is obeyed for 0～10μg/25ml Ni(Ⅱ). This method has been applied to the determination of nickel in aluminium alloys with satisfactory results.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第1期57-60,共4页
Journal of East China Normal University(Natural Science)
关键词
酸碱平衡
镍
测定
分光光度法
显色反应
BTAEB
thiazolylazo chromogenic reagent acid-base equilibrium determination of nickel spectrophotometric analysis
