GB/T 18115.4-2021 in English
VALIDChemical analysis methods of rare earth impurities in rare earth metals and their oxides—Part 4:Determination of lanthanum,cerium,praseodymium,samarium,europium,gadolinium,terbium,dysprosium,holmium,erbium,thulium,ytterbium,lutetium and yttrium contents
- Issued on:2021-10-11
- Implemented on:2022-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$418.00
《GB/T 18115.4-2021稀土金属及其氧化物中稀土杂质化学分析方法 第4部分：钕中镧、铈、镨、钐、铕、钆、铽、镝、钬、铒、铥、镱、镥和钇量的测定》由TC229（全国稀土标准化技术委员会）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
| Method type | Detection range(%) | Technical features | Applicable scenarios |
|---|---|---|---|
| ICP-OES | 0.001-0.6 | Matrix matching correction | Conventional content detection |
| ICP-MS | 0.00001-0.02 | Microcolumn separation technology | Trace analysis |
| ICP-MS-MS | 0.00001-0.02 | Triple quadrupole detection | Ultra-trace arbitration |
Key technology evolution
Main improvements of the 2021 standard:
- Expanding the detection range of praseodymium oxide to 0.01%-0.6%
- Adding ICP-MS-MS method to solve the 0.00001% level detection problem
- Optimizing the matrix removal efficiency of the TODGA separation column
Inductively coupled plasma tandem mass spectrometer adopts oxygen/ammonia mass transfer mode to effectively eliminate the interference of the neodymium matrix on mass numbers such as 153Tb+ and 159Dy+.
Implementation suggestions
- Method selection: ICP-MS arbitration is preferred for overlapping ranges
- Sample treatment: The surface oxide layer of metal samples needs to be removed
- Quality control points: Internal standard elements cesium (133Cs) and thallium (205Tl) need to be added online
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