Method for measuring total iron
A solution and alkali fusion technology, applied in the field of analysis and detection, can solve problems such as polluting the environment, harmful to analysts' health, and inaccurate data
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Embodiment 1
[0036] Take the GSB H 3005-97 national standard sample as the sample, which contains 56.09% iron.
[0037] 1. Weigh 0.2g of the sample into a corundum crucible, add 2-3g of sodium peroxide, mix well, then add 1g of sodium peroxide to cover, melt in a muffle furnace at 600-700°C for 10min, take it out and cool it, and first use hot water After leaching, add 15ml of hydrochloric acid, heat to near boiling on an electric furnace, add 100g / l tin dichloride dropwise while hot to reduce to light yellow, and cool to room temperature with running water.
[0038] 2. Add 15 drops of 250g / L sodium tungstate to the solution, add titanium trichloride solution dropwise until the tungsten blue, add 2-3 drops of copper sulfate solution, shake to make the tungsten blue disappear, add 10ml sulfur phosphorus mixed acid (2 +3), 10 drops of sodium diphenylamine sulfonate, titrated with potassium dichromate standard solution to purple as the end point.
[0039] 3. The measurement result is 55.90% ...
Embodiment 2
[0041] Take the GBW 07170 national standard sample as the sample, which contains 8.93% iron.
[0042] 1. Weigh 0.2g of the sample into a corundum crucible, add 2-3g of sodium peroxide, mix well, then add 1g of sodium peroxide to cover, melt in a muffle furnace at 600-700°C for 10min, take it out and cool it, and first use hot water After leaching, add 15ml of hydrochloric acid, heat to near boiling on an electric furnace, add 100g / l tin dichloride dropwise while hot to reduce to light yellow, and cool to room temperature with running water.
[0043] 2. Add 15 drops of 250g / L sodium tungstate to the solution, add titanium trichloride solution dropwise until the tungsten blue, add 2-3 drops of copper sulfate solution, shake to make the tungsten blue disappear, add 10ml sulfur phosphorus mixed acid (2 +3), 10 drops of sodium diphenylamine sulfonate, titrated with potassium dichromate standard solution to purple as the end point.
[0044] 3. The measurement result is 8.90% iron c...
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