ISO 4293:1982 Preview
Manganese ores and concentrates -- Determination of phosphorus content -- Extraction-molybdovanadate photometric method
The method is applicable to products having phosphorus contents from 0,02 to 0,5 % (m/m). ISO 4293 should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, sample, procedure and expression of results.