SPECTROPHOTOMETRIC DETERMINATION OF ARSENIC BY MOLYBDENUM BLUE METHODIN ZINC LEAD CONCENTRATES AND RELATED SMELTER PRODUCTS AFTER CHLOROFORM EXTRACTION OF IODIDE COMPLEX

The most popular and widely applied method for determination of arseni c in ore concentrates is by spectrophotometry of arsenomolybdic acid r educed to molybdenum blue. While applying this method, several authors have developed procedures which varied in the decomposition, separati on of arsenic and in the final colour development. Data regarding inte rference from germanium is inadequate. The present paper describes a p rocedure, which combines the best features of the previous procedures and is simple, less time consuming and interference-free compared to e arlier procedures. This method has been applied to zinc-lead concentra tes and related smelter products.