The determination of iron(II) oxide in silicate and refractory materials. Part II. A semi-micro titrimetric method for determining iron(II) oxide in silicate materials

Abstract

A description is given of an apparatus of simple construction that can be made from plastic, in which the decomposition of silicate materials by hydrofluoric acid can be carried out. The procedure for the titration of iron(II) with dichromate under conditions that eliminate the risk of oxidation is outlined.

A comparison has been made between dichromate titres obtained potentiometrically and with diphenylamine sulphonate as indicator. Errors associated with the latter in the titration of small amounts of iron(II) are discussed. The method of sample decomposition and titration of iron(II) has been assessed by determining the iron(II) oxide content of the diabase W-1, and has been applied to the determination of iron(II) oxide in slages from a boiler fired with pulverised fuel.