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See Chinese contents: GB/T 5686.4-2008 GB/T 5686.4-2008: Ferromanganese, ferromanganese-silicon, nitrogen-bearing ferromanganese and manganese metal -- Determination of phosphorus content -- Molybdenum blue photometric method and alkali content titrimetric method
This Part specifies the determination of phosphorus content in ferromanganese, ferromanganese-silicon, nitrogen-bearing ferromanganese, manganese metal and electrolytic manganese by the molybdenum blue photometric method and the alkali content titrimetric method.
