Determination method of silicon manganese phosphorus in alloy steel:
Determination of manganese (silver salt - ammonium persulfate oxidation spectrophotometry):
First, the main reagent
1. Nitric acid - silver nitrate (0.4%): in 1000 ml of dilute nitric acid (1+4), add 4 g of silver nitrate; 2. ammonium persulfate solution (15%); &l
Determination method of silicon manganese phosphorus in alloy steel: Determination of manganese (silver salt - ammonium persulfate oxidation spectrophotometry):
First, the main reagent
1. Nitric acid - silver nitrate (0.4%): in 1000 ml of dilute nitric acid (1+4), add 4 g of silver nitrate; 2. ammonium persulfate solution (15%); &l
Determination of manganese (silver salt - ammonium persulfate oxidation spectrophotometry):
First, the main reagent
1. Nitric acid-silver nitrate (0.4%): in 1000 ml of dilute nitric acid (1+4), add 4 g of silver nitrate; 2. ammonium persulfate solution (15%);
Second, the analysis operation: Weigh 40mg in a 250ml high beaker, add 10ml nitric acid - silver nitrate solution, heat dissolved, add 5ml ammonium persulfate solution, boil 10S, remove, add 40ml, shake, at a wavelength of 530nm At the 2cm cuvette, the water is the reference and the absorbance is measured.
Determination of silicon (ferrous reduction - silicon molybdenum blue method):
First, the main reagent 1, nitric acid (1 + 4); 2, potassium permanganate solution (5%); 3, alkaline ammonium molybdate solution: weigh 5g ammonium molybdate, add 12.5g potassium carbonate, dissolved, Dilute to 100ml; 4, oxalic acid solution (2.5%) 5, ammonium ferrous sulfate solution (1%): 1 ml of concentrated sulfuric acid per 100 ml of solution.
Second, the analysis operation: Weigh sample 30mg in a 250ml high-type beaker, add 10ml of nitric acid (1+4), heat to the sample to dissolve, shake to let the yellow gas escape, add 3 drops of potassium permanganate solution, heat to Boiling, remove, immediately add 10ml of alkaline ammonium molybdate solution, shake for 10 seconds, add 40ml oxalic acid solution, 40ml ammonium ferrous sulfate solution, shake, at a wavelength of 660nm, 0.5cm cuvette, water for reference, Measure its absorbance.
Determination of phosphorus (sodium fluoride - stannous chloride - phosphorus molybdenum blue method):
First, the main reagent 1, nitric acid (1 + 2.5); 2, potassium permanganate solution (5%); 3, ammonium molybdate (10%) - sodium potassium tartrate (10%) (1 +1 mixed on the day); 4, sodium fluoride - stannous chloride solution: firstly prepare a large amount of sodium chloride solution (2.4%), stored in plastic buckets for use, weigh 2g of stannous chloride, add hydrochloric acid (1+1) 5ml, Heat to a full temperature at low temperature and dilute to 1000 ml with a sodium fluoride solution (2.4%).
Second, the analysis operation: weigh 50mg sample, placed in a 250ml high-type beaker, add 10ml of nitric acid (1 +2.5), heated to dissolve the sample, add 6 drops of potassium permanganate solution (5%), to Stable purplish red, boiled to precipitate with brown manganese dioxide. Immediately add 10 ml of ammonium molybdate-potassium tartrate solution, shake well, add 40 ml of sodium fluoride-thin chloride solution, shake well. In the 660 nm, 2 cm cuvette, water is the reference and the absorbance is measured.
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