GB/T 20975.27-2018 in English
VALIDMethods for chemical analysis of aluminium and aluminium alloys—Part 27:Determination of cerium,lanthanum,scandium—Inductively coupled plasma atomic emission spectrometry method
- Issued on:-
- Implemented on:2019-02-01
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《GB/T 20975.27-2018铝及铝合金化学分析方法 第27部分：铈、镧、钪含量的测定 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，TC243SC1（全国有色金属标准化技术委员会轻金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
Determination of cerium and lanthanum content in aluminum and aluminum alloys
GB/T 20975.27-2018 standard specifies the method of using inductively coupled plasma atomic emission spectrometry (ICP-AES) to determine the content of cerium (Ce), lanthanum (La) and scandium (Sc) in aluminum and aluminum alloys. It is applicable to the determination of samples with mass fractions ranging from 0.005% to 0.90% for cerium, 0.005% to 0.50% for lanthanum and 0.0002% to 0.50% for scandium.
Background of standard formulation
With the wide application of aluminum and aluminum alloys in aerospace, automobile manufacturing and other fields, higher requirements are put forward for the accurate analysis of alloy composition. Traditional spectrophotometry and flame atomic absorption have problems such as low sensitivity and many interferences when detecting rare earth elements. ICP-AES technology has become an ideal choice for the determination of cerium and lanthanum due to its high sensitivity, simultaneous detection of multiple elements and less spectral interference.
Comparison of standard frameworks
| Items | GB/T 20975.27—2018 | Other standard methods |
|---|---|---|
| Measurement object | Cerium and lanthanum content in aluminum and aluminum alloys | Single detection or specific alloy component analysis |
| Detection method | ICP-AES method | Spectrophotometry, flame atomic absorption spectrometry |
| Sensitivity | Cerium: 0.005%~0.90%, Lanthanum: 0.005%~0.50% | Low, especially limited in trace analysis |
Technology Evolution Analysis
The introduction of ICP-AES technology marks a major advancement in rare earth element detection technology. Compared with traditional spectrophotometry, ICP-AES not only improves detection sensitivity and accuracy, but also significantly reduces spectral interference problems, and is particularly suitable for the simultaneous determination of multiple rare earth elements in complex alloy samples.
Implementation Recommendations
Key Notes
- Sample Treatment: Different dissolution methods are used according to different silicon content. When the silicon content is ≤2%, it is directly dissolved with hydrochloric acid; when the silicon content is >2%, it needs to be pretreated with sodium hydroxide.
- Instrument Calibration: Regularly calibrate the ICP-AES equipment to ensure that its performance indicators meet the requirements (such as the relative standard deviation of 1.0 μg/mL copper standard solution ≤2%).
- Blank test: Carry out a blank test with the sample to accurately deduct the influence of the blank value on the measurement result.
- Working curve: Select the appropriate standard solution concentration according to the mass fraction range of cerium and lanthanum in the sample, and draw a calibration curve. The linear correlation coefficient should be ≥0.99 to ensure data reliability.
Quality assurance and control
It is recommended to regularly verify the analytical method with standard samples or control samples, at least once a year. When the process is out of control, the cause should be found and corrected in time, and recalibrated.
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