Abstract: Oscillographic precipitating titration on uncoupled platinum electrode was studied.Anew method of preprocessing Pt electode is given.The theories of oscillographic titration on uncoupled Pt electrode were proposed.This titration is different from classical potentiometric titration.Its titration curve dose not conform to Nernst equation.The potential change is transient, the change of E-t curve on the endpoint is given in the form of peak-shape and can be observed on the oscillograph.The accurate results were obtained.

Key words: Oscillographic titration, Uncoupled platinum electrode, Precipitating titration