恒电位氟-铝配位滴定法测定铝的研究

Study on aluminium determination with aluminium-fluoride complex formation by titration under constant potential

以氟离子溶液作滴定剂,氟离子选择性电极作指示电极,对恒电位配位滴定法测定铝进行了研究,导出了该测定法的计算模型。测定结果的准确度受电位的控制误差对滴定剂体积误差的影响及滴定剂体积的相对误差两个因素影响。在滴定的中间位置,准确度比较高。随着滴定剂体积的增加,测定的灵敏度增加。方法可用于金属铝及锌 铝合金中铝的测定。

The aluminium determination in aluminium-fluoride complex formation by titration under constant potential with fluoride ion as titrant and fluoride ion selective electrode as indicating electrode has been studied. The mathematical model was made for the calculation of aluminium in the above system. It was found that the accuracy in the determination aluminium was controlled by two factors. One is the error in potential control over the volumerical deviation of the titrant and the other is the relative deviation of the volume of the titrant. The accuracy is relatively high in the intermediate stage during the titration and with the increasing volume of the titrant the sensitivity for the determination goes well either. The results of aluminium determination in both metal status and zinc-aluminium alloy status were satisfactory.