酸碱滴定法测定六硼化镧中硼的研究

Research on Deternination of Boron in LaB_6 by Acid-Base Titration

六硼化镧试样经稀硝酸溶解,以乙二胺四乙酸二钠为掩蔽剂,甘露醇为硼酸络合剂,采用酸碱滴定法测定硼含量。对溶样方法、试剂加入量、滴定终点判断方式、干扰元素、回收率和精密度进行了研究。本方法操作简单、快速、准确,具有良好的准确度和精密度,硼回收率在99.45%~100.48%之间,RSD小于0.50%。

The LaB6 sample was dissolved with dilute nitric acid,and then its boron content was determined by acid-base titration with EDTA as the masking agent and mannitol as the complexing agent of boronic acid.Sample dissolution methods,reagent dosage,judgment methods of titration end-point,interfering elements,recovery ratio and precision were investigated.Operation with the method is simple and fast,and the method has good accuracy and precision with boron recovery of 99.45% ~100.48% and RSD less than0.50%。