GB/T 5686.4-2008: Translated English of Chinese Standard. (GBT 5686.4-2008, GB/T5686.4-2008, GBT5686.4-2008): Ferromanganese, ferromanganese-silicon, nitrogenbearing ferromanganese and manganese metal - Determination of phosphorus content - Molybdenum blue photometric method and alkali content titrimetric method
https://www.chinesestandard.net, Aug 2, 2020 - Science - 16 pages
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.
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100 mL beakers according acid standard titration add 20 mL add 5 mL Allowable difference analysis applicable arsenic blank test blue photometric method boil Calculate cool cover decompose determination of phosphorus dissolve drive drops of phenolphthalein dropwise electrolytic manganese ferromanganese-silicon filter paper g/mL GB/T heat and evaporate hydrobromic acid hydrochloric acid hydrofluoric acid hydroxide standard solution iron laboratory manganese dioxide manganese metal mark mass fraction measure its absorbance milliliters mL minutes mL beaker mL conical flask mL of ammonium mL of nitric mL of perchloric molybdenum blue photometric nitric acid standard nitrogen-bearing ferromanganese operations perchloric acid 3.2.5 perchloric acid fume phosphorus content phosphorus standard solution reagent reference reflux remove sample shake silicon smoke sodium hydroxide standard solution contains standard titration solution sulfamic acid Table Take test solution Transfer the test volume wall warm water watch glass water to dilute wavelength of 825 Weigh white smoke