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Determination of rare metal elements in 304 stainless steel pipe|Stainless steel pipe knowledge

by:HHGG     2021-05-04
Determination of rare metal elements in 304 stainless steel tubes 2017-09-28 Determination of rare metal elements in 304 stainless steel tubes:   1, Determination of chromium:    divide 5ml mother liquor into a 250ml volumetric flask, add 10ml sulfur-phosphorus mixed acid, 5ml diphenylamine Shake up the base urea and dissolve it with water to 250ml, 1cm cuvette, and measure at the wavelength of 530nm.  2, Determination of nickel:    divide 5ml mother liquor into a 250ml volumetric flask, add 5ml iodine-ammonium citrate solution, 5ml diacetyl diketone solution, shake well, dilute to the mark with water. 1cm cuvette, measured at 530nm.  3, determination of manganese:    divide 20ml mother liquor into a 50ml volumetric flask, add 10ml sodium periodate solution, shake well, dilute to the mark with water, 2cm cuvette, and measure at 530nm wavelength. 4. Determination of phosphorus:    divide 10ml mother liquor into a 50ml volumetric flask, add 5ml nitric acid (1+4), 5ml ammonium molybdate, heat for 30 seconds, remove, add 20ml sodium fluoride-stannous chloride solution to shake Evenly, dilute to the mark with water. 2cm cuvette, measured at 680nm. 5. Determination of silicon:    weigh 20mg sample in a plastic beaker, add 5ml of water to heat to dissolve, add dropwise hydrofluoric acid to help dissolve, after the sample is completely dissolved, add 5ml of ammonium molybdate, boiling water for 30 seconds, remove , Add 5ml oxalic acid, immediately add 5ml ferrous ammonium sulfate, shake well, measure at 680nm wavelength in 1cm cuvette.  
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