A method for the direct titrimetric determination of iron(III) in silicate rocks

Abstract

The rock sample is decomposed with hydrofluoric acid in the manner of a conventional iron(II) determination, and the iron(III) in the resulting solution is determined by titration with a solution of ferrocene (dicyclopentadienyliron) in 2-methoxyethanol. A modified procedure is necessary for rocks of very high magnesium content, and it is indicated that errors may arise in the conventional iron(II) determination when applied to rocks of this type.