电位滴定法测定齿轮酸蚀检测用酸蚀液、漂白液总酸度  

Determination of total acidity in acid etching solution and bleaching solution for gear acid etching detection by potentiometric titration

作　　者：刘守江[1] 

机构地区：[1]陕西法士特汽车传动工程研究院,陕西西安710119

出　　处：《冶金分析》2018年第1期58-63,共6页Metallurgical Analysis

摘　　要：准确测定使用过程中的齿轮酸蚀检测用酸蚀液、漂白液的总酸度,对于判定齿轮酸蚀检测用酸蚀液、漂白液能否继续使用具有重要意义。实验通过加入10mL草酸钠饱和溶液以有效掩蔽溶液中的Fe2+和Fe3+,采用0.5mol/L氢氧化钠标准滴定溶液进行滴定,选取滴定过程中第1个等当点EP1为滴定终点,实现了电位滴定法对齿轮酸蚀检测用酸蚀液、漂白液总酸度的测定。采用实验方法对未使用的、使用7d的、使用14d的齿轮酸蚀检测用酸蚀液、漂白液总酸度进行测定,并进行加标回收试验,结果表明,这3种样品测定结果的相对标准偏差(RSD,n=6)均小于1.0%,加标回收率分别在99%~102%、98%~102%之间。分别采用实验方法和手动酸碱滴定法对使用14d的齿轮酸蚀检测用酸蚀液和漂白液总酸度进行测定,测定结果基本一致。The accurate determination of total acidity of acid etching solution and bleaching solution for acid etching detection of gear has important significance to decide that whether the acid etching solution and bleaching solution for acid etching detection of gear can be further used or not.10 mL of saturated sodium oxalate solution was added to effectively mask the Fe2+and Fe3+.The sample solution was titrated with0.5 mol/L sodium hydroxide standard titration solution.The first equivalent point(EP1)in titration process was selected as the titration endpoint,realizing the determination of total acidity of acid etching solution and bleaching solution for acid etching detection of gear by potentiometric titration.The total acidity of acid etching solution and bleaching solution(unused,used for 7 dand used for 14 d)was determined according to the experimental method.The recovery tests were also performed.The results showed that the relative standard deviations(RSD,n=6)of three samples were all less than 1.0%.The recoveries were99%-102% and 98%-102%,respectively.The total acidity of acid etching solution and bleaching solution for acid etching detection of gear(used for 14 d)was determined by the experimental method and manual acid-base titration,and the found results were basically consistent.

关 键 词：酸蚀检测 电位滴定法 酸蚀液 漂白液 总酸度 草酸钠 

分 类 号：O657.1[理学—分析化学] TG154[理学—化学]