电位滴定法测定电化学抛光液中混酸含量  

Determination of mixed acids in electrochemical polishing solution by automatic potentiometric titration

作　　者：郝晓玉 龚雁 陈朝晖 

机构地区：[1]瑞士万通中国有限公司,北京100192

出　　处：《分析试验室》2015年第1期57-60,共4页Chinese Journal of Analysis Laboratory

摘　　要：利用自动电位滴定仪,对电化学抛光液中各种混酸含量进行了分别定量。阐述了两种不同组成电化学抛光液中混酸(HNO3/H2SO4/Cr O3,H3PO4/H2SO4/Cr O3)测定方法的原理及步骤。使用自动电位滴定仪,通过电位变化判断终点,避免了指示剂指示终点引入的操作误差。方法的加标回收率达到99%以上。In this paper, an automatic potentiometric titration method was developed for the determination of mixed acid contents in electrochemical polishing solution. The determination fundamental and procedures of two different mixed acid samples （HNO3/H2SO4/CrO3, H3PO4/H2SO4/CrO3 ） were described. The control of titration end point by automatic potentiometric titrator can avoid the operator error caused by chemical indicator. The proposed method has high veracity with recovery rate of 99% , which meets the demands of practical analysis.

关 键 词：电位滴定 电化学抛光液 混酸 

分 类 号：O657.1[理学—分析化学]