Measurement method for copper content in iron-copper-tin ternary prealloy powder
A technology of pre-alloyed powder and determination method, which is applied in the direction of chemical analysis by titration method, and can solve problems such as inability to qualitative analysis.
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Embodiment 1
[0025] 1. Weigh 0.4g elemental iron powder, 0.1g elemental copper powder, and 0.05g elemental tin powder in the same 500mL conical flask, add 5mL hydrochloric acid solution, 5mL hydrogen peroxide, heat to dissolve and boil for 2-3min;
[0026] 2. Cool, add 20mL water, 3-5g ammonium chloride, 20mL ammonia water, 0.5g ammonium persulfate, heat and boil until big bubbles appear, then cool and filter to take the filtrate (the filter residue is washed with ammonia water until the effluent is colorless) , Add phosphoric acid dropwise until the precipitate just dissolves and an excess of 5mL, cool to room temperature;
[0027] 3. After adding 0.5-1g of sodium fluoride to dissolve it, add 2g of potassium iodide and shake slightly;
[0028] 4. Add 100 mL of water and immediately titrate with sodium thiosulfate standard titration solution to light yellow, add 2-3 mL of starch solution, and titrate to light purple;
[0029] 5. Add 10mL sodium thiocyanate solution, continue to titrate to milky wh...
Embodiment 2
[0034] 1. Weigh 0.2g of the powder to be tested in a 500mL conical flask, add 5mL hydrochloric acid solution, 5mL hydrogen peroxide, heat to dissolve and boil for 2-3min;
[0035] 2. Cool, add 20mL water, 3-5g ammonium chloride, 20mL ammonia water, 0.5g ammonium persulfate, heat and boil until big bubbles appear, then cool and filter to take the filtrate (the filter residue is washed with ammonia water until the effluent is colorless) , Add phosphoric acid dropwise until the precipitate just dissolves and an excess of 5mL, cool to room temperature;
[0036] 3. After adding 0.5-1g of sodium fluoride to dissolve it, add 2g of potassium iodide and shake slightly;
[0037] 4. Add 100 mL of water and immediately titrate with sodium thiosulfate standard titration solution to light yellow, add 2-3 mL of starch solution, and titrate to light purple;
[0038] 5. Add 10mL sodium thiocyanate solution, continue to titrate to milky white, wait for 30S to not fade;
[0039] 6. Calculate the copper c...
Embodiment 3
[0050] 1. Weigh 0.5g of the powder to be tested in a 500mL conical flask, add 15mL hydrochloric acid solution, 10mL hydrogen peroxide, heat to dissolve and boil for 2-3min;
[0051] 2. Cool, add 20mL water, 3-5g ammonium chloride, 20mL ammonia water, 0.5g ammonium persulfate, heat and boil until big bubbles appear, then cool and filter to take the filtrate (the filter residue is washed with ammonia water until the effluent is colorless) , Add phosphoric acid dropwise until the precipitate just dissolves and an excess of 5mL, cool to room temperature;
[0052] 3. After adding 0.5-1g of sodium fluoride to dissolve it, add 2g of potassium iodide and shake slightly;
[0053] 4. Add 100 mL of water and immediately titrate with sodium thiosulfate standard titration solution to light yellow, add 2-3 mL of starch solution, and titrate to light purple;
[0054] 7. Add 10mL sodium thiocyanate solution, continue to titrate to milky white, wait for 30S to not fade;
[0055] 8. Calculate the copper...
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