高锰酸根电极的研制及应用

CONSTRUCTION OF PERMANGANATE ION-SELECTIVE ELECTRODE AND ITS APPLICATION

利用十六烷基三甲基溴化铵与高锰酸根形成缔合物,溶解于5％PVC-THF溶液中,滴加增塑剂邻苯二甲酸二丁醋,制成PVC膜高锰酸根电极.此电极的Nernst响应范围在1.1×10^(-3)-9.3×10^(-6)mol/L;斜率为50.1 mV;响应时间2-6 min。并用此电极作指示电极,用电位滴定法测亚铁,与化学滴定法比较,得到满意的结果。

The construction of a PVC-membranc type permanganate ionselective electrode and its application to potentiometric titrations are described. The Cetyltrimethylammoniumpermanganate ion-pair is dissolved in 5％ PVC-THF solution, and dibutyl phthalate is used as the plasticizer of the PVC-membrane ion-selective electrode. The electrode gives Nernstian response to permanganate in the concentration range from 1.1×10^(-3) to 9.3×10^(-6)mol/L^(-1). The potential is almost independent of pH over the range of 3.8 to 8.5, and the response time is 2 to 6 min. The electrode can be used as indicator electrode in potentiometric titrations with permanganate.