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ISO 621:1981
M00000147
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ISO 621:1981 Manganese ores -- Determination of metallic iron content (metallic iron content not exceeding 2 %) -- Sulphosalicylic acid photometric method
standard by International Organization for Standardization, 11/01/1981
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This second edition cancels and replaces the first edition (i.e. ISO 621-1975). Specifies principle, reagents, apparatus, sample, procedure and expression of results.