ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 23, Number 6
JKCSEZ 23(6)
December 20, 1979 

It was found that cupric ion selective electrode, which was prepared by mixing CuS and Ag2S with the ratio four to one and PVC, was hard and durable. The response potentials were reproducible and linear in the range from 1.0 × 10-1 M to 1.0 × 10-5 M copper (Ⅱ) solution and its slope was 25.0 mV per decade concentration at 298˚K, slightly different from Nernstian slope. The copper (Ⅱ) indicating electrode was applied in precipitation titration of 1.0 × 10-2 M Cu(Ⅱ) sample solution containing proper amounts NaNO3 with 0.1 M NaOH standard solution. Also, this electrode could be used in complex titration of Zn(Ⅱ), Mg(Ⅱ), Ca(Ⅱ) with EDTA and stability constant of EDTA complex of Ca(Ⅱ) and Mg(Ⅱ) was calculated by using known Cu-EDTA2- stability constant.