Determination of ferrous and ferric iron from total iron content and thermogravimetric analysis

摘要

Ferrous (Fe2+) and ferric (Fe3+) iron content in mineral samples was determined from total iron (as obtained, for instance, from X-ray fluorescence analysis) and mass increase upon switching the purge gas from inert to oxidizing, at high temperature, in a thermogravimetric analysis. The method was validated using analytical-grade ilmenite (FeTiO3, or Fe2+OTiO2) and magnetite (Fe3O4, or Fe2+ Fe