Bipotentiometric titrations with standard solutions of manganese(III) and manganese(IV)

Abstract

The stability of standard solutions of manganese(III) and manganese(IV) was studied and conditions for bipotentiometric determinations of iron(II), potassium hexacyanoferrate(II), arsenic(III), oxalate and hydroquinone with these oxidants were investigated. Arsenic(III) can be determined only in the presence of suitable catalysts. The reversibility of redox pairs formed in the course of titration depends on the composition of the solution and the current used for the polarisation of the electrodes. The results obtained were good and reproducible.