GB/T 14352.20-2021 in English
VALIDMethods for chemical analysis of tungsten ores and molybdenum ores -- Part 20：Determination of niobium，tantalum，zirconium，hafnium and 15 rare earth elements content -- Inductively coupled plasma mass spectrometry
- Issued on:2021-03-09
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$233.00
《GB/T 14352.20-2021钨矿石、钼矿石化学分析方法 第20部分：铌、钽、锆、铪及15个稀土元素量的测定 电感耦合等离子体质谱法》由TC93（全国自然资源与国土空间规划标准化技术委员会）归口，主管部门为自然资源部(国土)。
Introduction
Analysis of the core content of the standard
This section establishes a standardized method for the simultaneous determination of 19 key elements in tungsten and molybdenum ores by inductively coupled plasma mass spectrometry. The technical points include:
| Technical indicators | Light rare earth elements | Heavy rare earth elements | Refractory metals |
|---|---|---|---|
| Detection limit (μg/g) | 0.008-0.2 | 0.02-0.14 | 0.005-0.11 |
| Linear range (μg/g) | 0.05-1000 | 0.1-100 | 0.1-500 |
| RSD(%) | 3.8-15.7 | 5.0-21.1 | 2.5-13.4 |
Key Technological Breakthroughs
The sample pretreatment scheme of sodium hydroxide-sodium peroxide fusion combined with tartaric acid-hydrochloric acid medium effectively solves the following problems:
- Incomplete decomposition of refractory metal oxides
- Precipitation loss of rare earth elements in alkaline media
- Signal suppression caused by matrix effect
Quality Assurance System
Dual internal standard correction (Rh103/Ir193) combined with interference correction equation (see Table A.3) ensures that the following are maintained in complex matrices:
- Oxide yield ≤1.5%
- Double charge interference ≤3.5%
- Recovery rate controlled at 85%-115%
Implementation Suggestions
Optimization solutions are recommended for different types of samples:
- High sulfur samples: Low temperature drying at 60-80℃ to prevent oxidation
- Samples containing niobium and tantalum: Add 5% tartaric acid to maintain solution stability
- Ultra-trace analysis: Use PFA digestion container
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