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See Chinese contents: GB/T 1508-2002 GB/T 1508-2002: Manganese ores -- Determination of total iron content -- Potassium dichromate titrimetric method and 1, 10-phenanthroline spectrophotometric method
This Part specifies the principle, reagents and materials, instruments, sampling and sample preparation, analytical procedures, result calculation, etc. of using potassium dichromate titrimetric method and 1,10-phenanthroline spectrophotometric method to determine the total iron content.
