Rapid determination of molybdenum in ferromolybdenum and molybdenum additives, with oxine.

A rapid method is presented for the gravimetric determination of molybdenum (as the oxinate) in ferromolybdenum and molybdenum additives. The sample is fused with a mixed flux of sodium peroxide and sodium carbonate in a zirconium crucible for complete decomposition. Leaching the cooled fusion cake with water provides instantaneous separation of molybdenum as sodium molybdate from iron(III) and other hydrous oxides.

Rapid photometric determination of phosphorus in iron ores and related materials as phosphomolybdenum-blue.

A rapid, simple and accurate method for determining phosphorus photometrically in iron ores and related materials, obviating the use of perchloric acid, is described. The sample is fused with sodium peroxide in a zirconium crucible and the melt dissolved in hydrochloric acid. The molybdenum-blue complex is developed by the addition of ammonium molybdate and hydrazine sulphate and the absorbance is measured at 725 nm.

Study of an analytical method for hexavalent chromium.

The diphenylcarbazide colorimetric method was evaluated by analyzing spiked PVC filters prepared by an AIHA-accredited consultant laboratory for chromium (VI). All seven participating laboratories received the samples and performed the analyses at the same time. Three laboratories simultaneously tested three alternative analytical procedures.

Universal technique for rapid dissolution of materials encountered in the steel industry and its applications in the photometric determination of arsenic, phosphorus, titanium and vanadium in iron ores.

A rapid, simple and virtually universal technique is described for decomposing a wide range of materials such as ores, sinters, slags, ferro-alloys and other reagents and additives used in the steel industry, as well as environmental dusts and particulate matter. The procedure involves fusion with sodium peroxide, alone or with sodium carbonate (mixed flux) in a zirconium or vitreous carbon crucible. Treatment of the fused melt with water and acid results in complete dissolution.

Complexometric determination of aluminium in iron ore, sinter, concentrates and agglomerates.

A method for the complexometric determination of aluminium in iron ore, sinter, concentrates and agglomerates encountered in international trade is described. The sample is fused in a zirconium crucible with a mixed flux of sodium carbonate and sodium peroxide. The fused mass is completely soluble in hydrochloric acid.