Studies on the Determination of Arsenic. III : Separation and Determination of Arsenic in Iron, Steel and Iron Ores by Use of Sodium Hypophosphite

Arsenic in iron, steel and iron ores was determined without any complicated apparatus or procedure. Arsenic in them was separated off as metallic arsenic in a hydrochloric acid solution with sodium hypophosphite by an aid of copper catalyser, the precipitated metallic arsenic was filtered with a Gooch crucible and dissolved in an excess of a standard iodine solution, and the excess of the iodine solution was titrated back with a standard sodium thiosulfate solution. By this method arsenic analysis of iron, steel and iron ore was made very correctly