摘要
叙述镧（Ⅲ）－２－（５－溴－２－吡啶偶氮）－５－二乙氨基苯酚（在ＰＶＡ和ＣＰＢ存在下）胶束增溶配合物的特性。ｐＨ＝１０．１时，Ｌａ３＋与２－（５－溴－２－吡啶偶氮）－５－二乙氨基苯酚（在ＰＶＡ、ＣＰＢ存在下）生成１：４的紫红色配合物。配合物最大吸收峰在６０５ｎｍ，其摩尔吸光系数ε为１．０×１０５Ｌ／ｍｏｌ·ｃｍ。该配合物形成稳定常数（ＬＯｇβ）为１５．９。０～８０μｇＬａ３＋／５０ｍＬ，服从朗伯－比尔定律。此法用于测定镍基合金镀层中的镧，结果令人满意。
The characteristics of La(Ⅲ) - 2 - (5 - Bromo - 2 - pyfidylazo) - 5 -Diethylamino phenol (in presence of PVA and CPB) micellar solubilizing complex are described. La3+and 2- (5-Bromo-2-pyfidylazo) -5-Diethylaminophenol (in presence of PVA and CPB)forms a 1:4 reddish-purple complex at PH 10.1. The complex exhibits maximum absorption at 605nm and has a molar absorptivity of 1.0 ×105L/mol·cm. The formation constant Logβ is 15.9. Lambert-Beer's law is obeyed for La3+ in a range of 0￣ 80μg La3+/50mL. The method is satisfactorily suitable for determination of lanthanum in nickel alloy deposits.
出处
《电镀与涂饰》
CAS
CSCD
1995年第2期30-33,共4页
Electroplating & Finishing
