The determination of molybdenum in high-nickel alloys by potentiometric titration with cerium(IV) solutions

A combination of ion-exchange separation and potentiometric titration is used in the determination of the molybdenum content of various high-nickel alloys that contain more than 4% molybdenum. The molybdenum(VI) fraction of a sample separated by ion exchange is reduced with tin(II) chloride and titrated with cerium(IV) sulfate. The method facilitates accurate, routine determinations without the extreme care that is required by the standard photometric method or the length and complexity of the gravimetric method. By suitable adjustment of the sample size or the strength of the titration solution, effective titrations can be conducted on samples containing up to 100% molybdenum.