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ISO 553:1981

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ISO 553:1981 Manganese ores -- Determination of vanadium content -- Titrimetric method and phosphotungstovanadate photometric method

standard by International Organization for Standardization, 11/01/1981

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Method I is applicable to manganese ores having vanadium contents greater than 0.05 % (m/m), method II is applicable to manganese ores having vanadium contents less than 0.05 % (m/m). This second edition cancels and replaces the first edition (i.e. ISO 553-1975). Should be read in conjunction with ISO 4297.