YS/T 445.6-2019 in English
VALIDMethods for chemical analysis of silver concentrates - Part 6: Determination of magnesium oxide content - Flame atomic absorption spectrometric method
- Issued on:2019-08-02
- Implemented on:2020-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$127.00
本部分规定了银精矿中氧化镁量的测定方法。
本部分适用于银精矿中氧化镁量的测定。测定范围：0.50%～5.00 %。
Introduction
Core changes in the standard revision
| Technical parameters | 2001 edition | 2019 edition | Impact of changes |
|---|---|---|---|
| Characteristic concentration | ≤0.411μg/mL | ≤0.200μg/mL | Detection sensitivity increased by 105% |
| Nitric acid dosage | 5mL | 10mL | Enhanced sample decomposition ability |
| Aliquot volume (0.5-3%) | 50mL | 20mL | Reduce matrix interference |
Key instrument parameter settings
Pay special attention when using flame atomic absorption spectrometer:
- Wavelength setting: 285.2nm (magnesium characteristic absorption line)
- Flame type: air-acetylene reducing flame (flow ratio recommended 4:1)
- Slit width: 0.4-0.7nm (adjusted according to instrument resolution)
Key points of sample processing technology
High silicon sample processing case
When the silicon content of the sample is greater than 5%, 10 mL of hydrofluoric acid needs to be added during the sample dissolution stage (Note: a polytetrafluoroethylene beaker must be used), and the subsequent fuming time of perchloric acid needs to be increased to 15 minutes to completely remove fluoride.
Precision control requirements
| Concentration range (%) | Repeatability limit (r) | Reproducibility limit (R) |
|---|---|---|
| 0.50-1.00 | 0.08 | 0.12 |
| 1.00-3.00 | 0.15 | 0.20 |
Implementation suggestions
- It is recommended to use Magnesium chloride reference material (purity ≥99.95%) when preparing standard solution
- For samples with a content of ＞3%, it is recommended to use the secondary dilution method to avoid exceeding the linear range
- Each batch of tests must be accompanied by the national standard material GBW07297 for process control
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