GB/T 38744-2020 in English
VALIDMethods for chemical analysis of synergistic catalysis elements in automotive exhaust catalysis—Determination of cerium,lanthanum,praseodymium,neodymium,barium and zirconium contents—Inductively coupled plasma atomic emission spectrometry
- Issued on:2020-04-28
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
《GB/T 38744-2020机动车尾气净化器中助剂元素化学分析方法 铈、镧、镨、钕、钡、锆含量的测定 电感耦合等离子体原子发射光谱法》由TC243（全国有色金属标准化技术委员会）归口，TC243SC5（全国有色金属标准化技术委员会贵金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
Technical Background of the Standard
With increasingly stringent regulations on motor vehicle emissions, the proportion of rare earth additives used in exhaust purifiers has increased from 35% in 2010 to 68% in 2020. This standard establishes a unified analysis method for key additive elements in purifiers for gasoline vehicles, diesel vehicles and motorcycles.
Core principles of the method
| Technical links | Key parameters | Key control points |
|---|---|---|
| Sample pretreatment | Sealed digestion at 150℃ for 12h | Hydrochloric acid + nitric acid + hydrofluoric acid composite system |
| Spectral analysis | Radial observation | Argon purity ≥99.99% |
| Working curve | R≥0.9995 | 5 gradient standard solutions |
Technical indicators of element determination
Cerium (Ce) and Zirconium (Zr): The determination range is 0.10%~10.0%, using 413.764nm (Ce) and 339.197nm (Zr) analysis lines, and the repeatability limit is ≤0.022% (at 0.24% content).
Lanthanide elements: Lanthanum (La), praseodymium (Pr), and neodymium (Nd) have a determination range of 0.025%~5.0%, and the characteristic spectral lines are 379.478nm, 414.311nm, and 430.358nm, respectively.
Analysis of implementation points
- Preparation of standard solution: Zirconium standard solution needs to be stored in plastic bottles to avoid adsorption by glass containers
- Interference control: Background correction and spectral interference correction are required
- Precision verification: The RSD of 11 measurements of copper standard solution should be ≤2.5%
Comparison of technological evolution
| Version | Pretreatment method | Detected elements | Precision |
|---|---|---|---|
| 2015 edition | Open acid solution | 4 types | RSD≤5% |
| 2020 Edition | Closed Digestion | 6 Types | RSD≤2.5% |
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