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 methodhttps://www.chinesestandard.net, 2 авг. 2020 г. - Всего страниц: 16 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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250 mL beaker acid standard titration add 10 mL add 5 mL alkali content titrimetric Allowable difference ammonium hydroxide ammonium molybdate blank test blue photometric method bromothymol blue Calibration curve drawing content mass fraction content titrimetric method cool determination of phosphorus ferromanganese-silicon filter paper g/mL heat and evaporate heat to evaporate hydrazine sulfate hydrobromic acid hydrochloric acid hydrofluoric acid hydroxide standard solution manganese dioxide manganese metal measure its absorbance metal and electrolytic milliliters mL mL conical flask mL of ammonium mL of nitric mL of perchloric mL of phosphorus molybdenum blue photometric nitric acid 4.2.3 nitric acid standard perchloric acid 3.2.5 perchloric acid fume phenolphthalein solution 4.2.14 Phosphorus content mass phosphorus standard solution potassium hydrogen phthalate potassium nitrate reference reagent Sample mass silicon sodium hydroxide standard sodium nitrite spectrophotometer standard titration solution sulfamic acid test solution Transfer the test warm water watch glass water to dilute wavelength of 825