铝存在时氟电极对氟的响应

Response of F-ISE to Fluoride in the presence of Aluminum

本文从溶液平衡的理论计算与实验较系统地研究了氟电极对络合剂的响应,有掩蔽剂和无掩蔽剂存在时,以及总铝T_(Al)及总氟T_F一定时的A1-F平衡。定量地说明了有铝存在时对测定氟的影响,比较了几种络合剂掩蔽铝的能力,探讨了用氟电极测定氟及电位滴定铝的适宜条件。

In this paper the equilibriums between aluminum and fluoride in the solution with or without complexing agents have been systematically studied on the basis of theoretical calculations and experiments. For determination of fluoride in the presence of aluminum, the maximum permissible amount of aluminum (T_(Alm)) has been obtained. An equation of seventh degree has been derived which is to be used for calculations of both aluminum and fluoride. The responses of F-ISE to four complexing agents (Tart, Cit, Tiron, SSA) are measured. The values of T_(Almax) which can be masked by four complexing agents in common use have been determined by experiments. These results presented are of some practical value.