镀镍溶液中镍的恒电流电位滴定法  

DETERMINATION OF NICKEL IN Ni PLATING BATH BY CONSTANT CURRENT POTENTIOMETRY

作　　者：肖满田 

机构地区：[1]福建红旗机器厂,邮政编码363000

出　　处：《电镀与环保》1993年第1期31-33,共3页Electroplating & Pollution Control

摘　　要：含有锌、镁、钴盐的镀镍溶液中镍含量可用恒电流电位滴定法直接测定。以镍的特效试剂丁二酮肟作为滴定剂,阳极极化的铂丝作为指示电极,阴极极化的钨棒作为参比电极,极化电流为2μA。滴定曲线有一个尖锐的峰,类似于普通电位滴定曲线的一阶导数形式。滴定在 pH 11的氨性缓冲溶液中进行,温度维持在40～50℃,方法简单、快速、准确。结果的标准偏差一般小于2.0g/L。Ni content in Ni plating solutions containing salts of Zn,Mg and Co can be directly deter- mined with constant current potentiometric titration method.Dimethylglyoxime is used as titrant, platinum wire as anodic polarized indicator electrode and tungsten rod as cathodic polarized re- ference electrode.Polarizing current is 2μA.This combination gives peak similar to first differ- ential one of ordinary potentiometric curve.Titration is performed in ammonical buffering solu- tion at pH 11 and 40-50℃.Other metal ions do not interfere.Some complexing agents such as tartrate,citrate,TEA,etc.are also permitted.This method is proved to be simple,rapid,accurate and economical with standard deviation less than 2.0g/L.(p.31-33)

关 键 词：镀镍 溶液 镍 恒电流 电位滴定法 

分 类 号：TQ153.12[化学工程—电化学工业]