GB/Z 39124-2020 in English
VALIDMethod for chemical analysis of lead concentrates—Determination of antimony content—Ce(SO4)2 titration method
- Issued on:2020-10-11
- Implemented on:2021-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/Z 39124-2020铅精矿化学分析方法 锑含量的测定 硫酸铈滴定法》由TC243（全国有色金属标准化技术委员会）归口，TC243SC2（全国有色金属标准化技术委员会重金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
Core method principle analysis
This method uses an electrical heating digestion device combined with an automatic potentiometric titrator to quantitatively determine the antimony element in lead concentrate through a redox reaction. Potassium sulfate is used to accelerate the decomposition of minerals, and filter paper carbonization is used to achieve efficient reduction of Sb(V)→Sb(III), and a dual indicator endpoint criterion system is established.
Comparison of standard operating characteristics
| Technical parameters | This method | Conventional method |
|---|---|---|
| Lower limit of detection | 0.80% | 1.20% |
| Analytical precision RSD | ≤0.26% | ≤0.45% |
| Interference handling capability | Fe³⁺ phosphate masking | Pre-separation required |
Technical evolution analysis
Compared with traditional EDTA complexometric titration, the cerium sulfate method improves detection efficiency through the following innovations:
- The methyl orange-methylene blue dual indicator system is used to significantly improve the sensitivity of endpoint judgment
- The temperature control accuracy is improved from ±5℃ to ±2℃, and the data stability is improved by 30%
- The dynamic addition of indicator mechanism is introduced to reduce the interference of high-speed rail samples
Operational practice suggestions
Key control points
- During the digestion stage, the sulfuric acid fume exhaust time is maintained for ≥8 minutes to ensure that nitrogen oxides are completely eliminated
- The titration temperature window is strictly controlled at 80~85℃. The optimal temperature parameters are shown in the collection matrix table shown in the figure
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