自动电位滴定法测定电池级碳酸锂中痕量氯  

Determination of Chloride Ion in Battery Grade Lithium Carbonate by Automatic Potentiometric Titration

作　　者：王裕生 廉芒芬 柳春月 林丽美 孙伟丽 WANG Yu-sheng;LIAN Mang-fen;LIU Chun-yue;LIN Li-mei;SUN Wei-li(Ningbo Ronbay New Energy Technology Co.,Ltd.,Ningbo 315400,China)

机构地区：[1]宁波容百新能源科技股份有限公司,浙江余姚315400

出　　处：《化学试剂》2021年第6期811-815,共5页Chemical Reagents

摘　　要：建立了自动电位滴定法测定电池级碳酸锂等化学品中痕量氯的测试方法。优化溶液总体积、溶剂、pH以及滴定参数后,碳酸锂等样品中氯离子测试加标回收率97.7%~102.4%,平均回收率99.1%,并通过加标测试避免高电位处可能出现的峰干扰。在样品测试中,电位滴定法与分光光度法的测试结果绝对差值≤0.0005%,并且测试时间通常低于10 min。优化后的电位滴定法氯离子测试检出限为0.2876μg,碳酸锂中氯离子测试绝对误差在±0.0001%范围内。此外,该方法也适用于氢氧化锂、硝酸铝等其他化学品中氯离子量的测定。An automatic potentiometric titration method for the determination of trace chlorine in battery grade lithium carbonate and other chemicals was established.After optimizing total solution volume,solvent,pH and titration parameters,the recovery of standard addition of chloride ion test in lithium carbonate was 97.7%~102.4%,and the standard addition method was used to eliminate the possible peak interference at high potential.In sample tests,the absolute difference between potentiometric titration method and spectrophotometry method was not larger than 0.0005%,and the testing duration was usually less than 10 min.The detection limit of the optimized potentiometric titration for chloride ion test was 0.2876μg,and the absolute error of chloride ion test in lithium carbonate was within±0.0001%.In addition,our method is also suitable for the determination of chloride ion in lithium hydroxide,aluminum nitrate and other chemicals.

关 键 词：电位滴定法 碳酸锂 氯离子 氢氧化锂 硝酸铝 

分 类 号：O655.24[理学—分析化学]