GB/T 4698.22-2017 in English
VALIDMethods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 22: Determination of niobium content - 5-Br-PADAP spectrophotometry and inductively coupled plasma atomic emission spectrometry
- Issued on:2017-09-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 4698.22-2017海绵钛、钛及钛合金化学分析方法 第22部分：铌量的测定 5-Br-PADAP分光光度法和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，TC243SC3（全国有色金属标准化技术委员会稀有金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
1. Standard Overview
GB/T 4698.22—2017 is the national standard of the People's Republic of China, which specifies the determination method of Nb content in titanium sponge, titanium and titanium alloys. This standard replaces the 1996 version of the standard, mainly adding inductively coupled plasma atomic emission spectrometry (ICP-AES) and expanding the determination range.
2. Method Comparison
| Method Name | Detection Principle | Determination Range | Sensitivity |
|---|---|---|---|
| 5-Br-PADAP Spectrophotometric Method | Spectrophotometric determination based on the formation of a colored complex between Nb and 5-Br-PADAP. | 0.10%～3.20% | High sensitivity, suitable for trace analysis. |
| Inductively coupled plasma atomic emission spectrometry (ICP-AES) | Use inductively coupled plasma to excite the Saw element in the sample and measure its characteristic spectrum. | 0.10%～16.00% | High sensitivity and selectivity, suitable for a wide concentration range. |
3. Principle and steps of the method
3.1 Spectrophotometry (arbitration method)
The sample is dissolved in sulfuric acid, 5-Br-PADAP is added to the acidic medium to generate a colored complex, and the absorbance is measured at 610nm by a spectrophotometer. The working curve is drawn from the standard solution.
3.2 ICP-AES method
The sample is dissolved with hydrochloric acid and hydrofluoric acid, and after adding nitric acid to oxidize titanium, the content of saw is determined by inductively coupled plasma atomic emission spectrometry. The standard solution is quantitatively analyzed by interpolation method.
4. Precision Analysis
| Method | Repeatability Limit (r) | Reproducibility Limit (R) |
|---|---|---|
| Spectrophotometry | r: 0.03%～0.13% | R: 0.04%～0.16% |
| ICP-AES | r: 0.01%～0.55% | R: 0.02%～0.60% |
5. Implementation Suggestions
Choose the appropriate method based on the range of saw content in the sample:
- For trace analysis (0.10% to 3.20%), spectrophotometry is preferred.
- For higher content analysis (0.10% to 16.00%), ICP-AES is recommended to obtain a wider dynamic range and higher sensitivity.
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