GB/T 20899.2-2019 in English
VALIDMethods for chemical analysis of gold ores -- Part 2: Determination of silver content -- Flame atomic absorption spectrometric method
- Issued on:2019-12-10
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 20899.2-2019金矿石化学分析方法 第2部分：银量的测定 火焰原子吸收光谱法》由TC379（全国黄金标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
This standard specifies the method for determining the silver content in gold ore using flame atomic absorption spectrometer, with the measurement range covering 2.00-1000.0g/t. The method optimization is reflected in:
- Using polytetrafluoroethylene beaker four-acid (hydrochloric acid + nitric acid + hydrofluoric acid + perchloric acid) sample dissolution system
- Characteristic concentration requirement ≤0.034μg/mL (sensitivity index)
- Precision requirement RSD≤1.0% (high concentration standard solution)
Comparison of new and old standard technologies
| Technical indicators | GB/T20899.2-2007 | GB/T20899.2-2019 | Description of changes |
|---|---|---|---|
| Precision expression | Allowance difference | Repeatability (r)/Reproducibility (R) | Using internationally accepted expressions |
| Pretreatment container | Glass beaker | PTFE beaker | Resistant to hydrofluoric acid corrosion |
| Acid system | Tri-acid decomposition | Tetra-acid decomposition | Adding hydrofluoric acid |
Key operating parameters
Instrument working conditions
- Measurement wavelength: 328.1nm
- Characteristic concentration: ≤0.034μg/mL (silver)
- Linear range: standard curve correlation coefficient ≥ 0.999
Sample processing requirements
- Particle size: ≤0.074mm (200 mesh)
- Drying conditions: 105℃ for 2h
- Sample weight: 0.20-1.00g (depending on content)
Precision control requirements
Repeatability limit (r) example
- When 6.50g/t: r=1.22g/t
- When 294.2g/t: r=11.5g/t
Reproducibility limit (R) example
- When 50.50g/t: R=5.76g/t
- When the concentration is 1091.3g/t: R=62.4g/t
Suggestions for the implementation of the standard
Laboratory preparation
- Configure Atomic absorption spectrometer with background correction
- Establish a traceability system for silver standard solution
- Train on the operating specifications of four-acid digestion
Key points of quality control
- Perform parallel samples and spike recovery for each batch of samples
- Regularly verify the linearity of the standard curve
- Monitor the fluctuation of blank value
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