电位滴定法测双草酸硼酸锂中游离酸的方法探索

The potentiometric method titration for measuring the trace amount of free acid in lithium bis(oxalate)borate

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 10 ug/g with relative standard deviation below 5.1% and its recovery rate is 92%-103%.