GB/T 13747.8-2017 in English
VALIDMethods for chemical analysis of zirconium and zirconium alloys - Part 8: Determination of cobalt content - Nitroso-R-salt spectrophotometry
- Issued on:2017-09-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 13747.8-2017锆及锆合金化学分析方法 第8部分：钴量的测定 亚硝基R盐分光光度法》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
Interpretation of the National Standard of the People's Republic of China GB/T 13747.8—2017
| Dimensions of the Standard Framework | Scope of Application | Principle of the Method | Key Steps |
|---|---|---|---|
| Standard Update | Replaces GB/T13747.8—1992 | Nitrosyl R Salt Spectrophotometry | Sample Dissolution, Extraction and Separation, Complexation and Color Development |
| Analysis Object | Zirconium Sponge, Zirconium and Zirconium Alloys | Chemical Colorimetry | Solution Preparation, Working Curve Drawing |
| Detection range | 0.0005%～0.0050% | Spectrophotometer method | Absorbance measurement, result calculation |
Standard formulation background and technology evolution analysis
GB/T13747 "Zirconium and Zirconium Alloy Chemical Analysis Method" series of standards is an important specification for zirconium and zirconium alloy material testing, which is divided into 27 parts. Part 8 of this interpretation is mainly for the determination of cobalt content, using nitrite R salt spectrophotometry.
Compared with the old version
Compared with GB/T13747.8-1992, the new version of the standard has been improved mainly in the following aspects:
- Deleted the referenced standard clauses
- Added the sample processing clause (Chapter 5)
- Changed the allowable difference to the precision clause
- Added the test report requirements (Chapter 9)
Detailed explanation of the analysis steps
The following are the detailed analysis steps of GB/T13747.8-2017 standard:
- Sample processing
- Weighing of sample
- Preparation of test solution
Cut the zirconium alloy sample into fragments with a length not exceeding 5 mm, clean them with carbon tetrachloride and dry them.
| Cobalt content/% | Sample amount/g |
|---|---|
| 0.0005～0.0020 | 1.00 |
| >0.0020～0.0050 | 0.50 |
Place the sample in a 150mL polyethylene cup, add 5mL water, 2mL hydrofluoric acid and 1mL nitric acid to dissolve the sample.
Precision and allowable error
| Mass fraction of cobalt/% | Repeatability limit/% | Tolerance/% |
|---|---|---|
| 0.0008 | 0.0004 | 0.0005 |
| 0.0020 | 0.0006 | 0.0007 |
Implementation Suggestions
To ensure the accurate implementation of the standard, it is recommended:
- Operators need to undergo professional training
- Regular calibration class=instrument>Spectrophotometer
- Strictly control the purity of reagents
- Record complete test report
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