电位滴定法测双草酸硼酸锂中游离酸的方法探索

摘要

建立了电位滴定法测双草酸硼酸锂中游离酸的检测方法,该方法以四丁基氢氧化铵的碳酸丙烯酯溶液为滴定标准溶液,在碳酸丙烯酯溶剂中,以复合玻璃电极为测量电极,采用非水酸碱电位滴定法测试双草酸硼酸锂中游离酸的含量.该方法解决了目前无法检测双草酸硼酸锂中游离酸的问题.测试结果表明:方法检出限在10μg/g以下,相对标准偏差<5.1%,回收率为92~103%.%This method takes the tetrabutylammonium hydroxide in propylene carbonate as standard solution for titration,and a composite glass electrode as the measuring electrode in the propylene carbonate solvent.The nonaqueous acid-base potentiometric titration method is used to test the free acid content in double oxalic acid boric lithium.This method solves a problem that the free acid in lithium borate can not be detected by traditional method.The results show that the limit of detection of the method is less than 10ug/g with relative standard deviation below 5.1% and its recovery rate is 92%-103%.