BCO光度法测定碱性镀锌液中微量铜  

SPECTROPHOTOMETRIC DETERMINATION OF TRACE COPPER IN ALKALINE ZINC PLATING BATH WITH BCO

作　　者：郭崇武 

机构地区：[1]吉林省辉南猎枪厂,135102

出　　处：《电镀与环保》1992年第5期27-28,共2页Electroplating & Pollution Control

摘　　要：本文根据 BCO 与二价铜离子在弱碱性溶液中的特效显色反应,制定了 BCO 光度法测定碱性镀锌溶液中的铜含量。用72型分光光度计,3cm 比色皿,以水作参比液,在波长600nm 处测定。在测定过程中,用盐酸酸化试液,然后用氨-氯化铵缓冲溶液调整试液的 pH 值至9.25。试验表明,铜含量和吸光度的关系符合比尔定律。镀液中的锌与氨生成锌氨络离子,不影响铜的测定。On basis of specific colour reaction of BCO with Cu^(2+) in weak alkaline solution,method of spectrophotometric determination of Cu content in alkaline Zn plating bath with BCO is established.Determination is made at 600 nm with Model 72 spectrophotometer and 3cm cell with water as reference.During determination,test solution is acidized with HCl and pH adjusted to 9.25 with NH_3-NH_4Cl buffering agent.Test shows relationship of Cu^(2+) with ab- scrbance obeys Beer's Law.Zn^(2+) in solution reacts with NH_3 to form Zn(NH_3)_4^(2+) without af- fecting determination of Cu^(2+).

关 键 词：BCO光度法 测定 镀锌液 微量铜 

分 类 号：X830.1[环境科学与工程—环境工程]