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ISO 4293:1982 Manganese ores and concentrates -- Determination of phosphorus content -- Extraction-molybdovanadate photometric method
standard by International Organization for Standardization, 08/01/1982
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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.