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See Chinese contents: GB/T 6730.18-2006 GB/T 6730.18-2006: Iron ores -- Determination of phosphorus content -- Molybdenum blue spectrophotometric method
This Part of GB/T 6730 specifies the molybdenum blue spectrophotometric method for the determination of phosphorus content. This method is applicable to the determination of phosphorus content in natural iron ores, iron concentrates, agglomerates, including sintered products. The presence of arsenic, barium, titanium does not affect the determination results. The determination range (mass fraction) is 0.003% ~ 2.00%.
