GB/T 32784-2016 in English
VALIDPig iron contenting nickel―Determination of chromium content―Ammonium per sulfate-ammonium ferrous sulfate titration method
- Issued on:2016-06-14
- Implemented on:2017-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 32784-2016含镍生铁 铬含量的测定 过硫酸铵-硫酸亚铁铵滴定法》由TC318（全国生铁及铁合金标准化技术委员会）归口，主管部门为中国钢铁工业协会。
Introduction
GB/T 32784—2016 Standard Interpretation
This standard specifies the method for determining the chromium content in nickel-containing pig iron, using the ammonium persulfate-ammonium ferrous sulfate titration method, which is suitable for the determination of chromium content in the mass fraction range of 0.50%~10.00%.
| Standard Dimensions | GB/T 32784—2016 | Comparison Standards | h>Difference Analysis|
|---|---|---|---|
| Scope of Application | Determination of Chromium Content in Nickel-Containing Pig Iron (0.50%~10.00%) | - | - |
| Determination Method | Ammonium Persulfate-Ammonium Ferrous Sulfate Titration Method | - | - |
| Reagent Requirements | Analytical Pure Reagents, Secondary Water (GB/T 6682) | - | - |
Method principle and steps
Sample decomposition:The sample is dissolved in hydrochloric acid and nitric acid, hydrofluoric acid is added to remove silicon, and then heated with sulfuric acid-phosphoric acid mixture until white smoke is emitted.
Oxidation process:Use ammonium persulfate to oxidize chromium to hexavalent state, add silver nitrate as a catalyst, and then use manganese sulfate solution to assist oxidation.
Titration steps:After cooling, add indicator (N-phenylated anthranilic acid) and titrate with ammonium ferrous sulfate standard titration solution until bright yellow-green is the end point. If excessive, potassium permanganate needs to be used for back titration.
Implementation Suggestions
In actual operation, it is recommended to:
- Prepare reagents and solutions strictly in accordance with the standards to ensure accurate concentration.
- Use high-precision burettes (GB/T 12805) and volumetric flasks (GB/T 12806) to ensure measurement accuracy.
- Pay attention to the safety of high-temperature operations, especially the handling of sulfuric acid-phosphoric acid mixtures.
- Regularly calibrate instruments and equipment to ensure the reliability of analysis results.
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