NEW CERIMETRIC DETERMINATION OF TELLURIUM(IV)

A new cerimetric method for the determination of tellurium(IV) is prop osed. The method makes use of ruthenium(III) catalysis in the presence of excess cerium(IV) to accomplish quantitative oxidation of telluriu m(IV) to tellurium(VI) at room temperature either in 1-3 mol l-1 sulph uric or 1-4 mol l-1 nitric acid medium. The determination is completed by titrating the excess cerium(IV) with standard iron(II) solution us ing ferroin as indicator.