title: Determination of the oxidizing capacity of manganese ores.
abstract: An accurate method is described for determining the amount of active oxygen in manganese ores, based on the oxidation-reduction reaction between the ore and arsenic(III) in presence of ammonium molybdate, followed by the back-titration of excess of arsenic(III) with cerium(IV), using osmium tetroxide as catalyst and Disulphine Blue V as indicator. A survey has been made of the applicability of this method to various pyrolusite ores containing less than 0.2% phosphorus. Aluminium(III), copper(II), iron(III), manganese(II), and molybdenum(VI) do not interfere. Up to 30% phosphorus(V) causes no interference.
authors.affiliation: Thomas Hill-Jones Ltd., 15 High Street, Stratford, London, E15 2QB, England.
authors.forename: R
authors.initials: R
authors.lastname: Prasad