Chemical determination of some major constituents in rocks and minerals

Macro-analytical schemes are described for the determination of aluminium, total iron and iron(II), as part of the complete analysis of silicate rocks and minerals Solvent extraction eliminates interferences before titration of aluminium with DCTA Iron(III) is extracted with MIBK and determined indirectly with EDTA Iron(II) is determined by potentiometric titration under an inert atmosphere. Interferences are removed with 2,4-pentanedione and carbon tetrachloride before the determination of calcium and magnesium.