WANG Xiaohong*,LI Jian.Determination of Zinc Chloride in Acid Zinc Electroplating Solution by Automatic Potentiometric Titration[J].Plating & Finishing,2021,(8):21-25.[doi:10.3969/j.issn.1001-3849.2021.08.005]
电位滴定法测定酸性镀锌溶液中氯化锌浓度
- Title:
- Determination of Zinc Chloride in Acid Zinc Electroplating Solution by Automatic Potentiometric Titration
- 文献标志码:
- A
- 摘要:
- 通过采用EDTA为滴定剂，钙电极为指示电极，双盐桥甘汞电极为参比电极，实现了酸性镀锌溶液中氯化锌含量的自动电位滴定。向待测液中加入Ca-EDTA（乙二胺四乙酸二钠钙）作为置换剂，增大了滴定终点时的电位突跃。实验考察了电极的种类、滴定剂预加体积、滴定剂的最大增量和最小增量、pH缓冲溶液和Ca-EDTA的加入量等对测定结果的影响，确定了最佳实验条件。本方法与手动滴定法的比对实验结果表明：两种测试方法测量数据基本一致。自动电位滴定方法准确可靠，测量过程简便快速，可以满足日常镀液分析的测定需求。
- Abstract:
- The automatic potentiometric titration of zinc chloride content in acid zinc plating solution was established by using EDTA as titrant, calcium electrode as indicator electrode and double salt bridge calomel electrode as reference electrode. The potential jump at the end of titration was increased by adding Ca-EDTA （disodium calcium ethylenediamine tetraacetate） to the solution to be measured as a displacement agent. The effects of the type of electrode, the pre-added volume of titrant, the maximum and minimum increment of titrant, the addition of pH buffer and Ca-EDTA on the determination results were investigated, and the optimum experimental conditions were determined. The results of comparison experiment between this method and manual titration method showed that the measured data of the two methods were basically consistent. Therefore, this method was accurate and reliable, the measurement process was simple and fast, and can meet the measurement needs of daily analysis of plating solution.
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备注/Memo
收稿日期： 2020-05-10；修回日期： 2020-07-06
作者简介： 王晓红（1983－）， 女， 硕士， 工程师， email： wangxiaohong@atmcn.com