GB/T 13747.13-2017 in English
VALIDMethods for chemical analysis of zirconium and zirconium alloys - Part 13: Determination of lead content - Polarography
- Issued on:2017-09-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 13747.13-2017锆及锆合金化学分析方法 第13部分：铅量的测定 极谱法》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
National Standard of the People's Republic of China GB/T 13747.13—2017
Chemical analysis methods for zirconium and zirconium alloys Part 13: Determination of lead content - Polarographic method
1. Background and significance of the standard
This standard replaces GB/T 13747.13—1992 and is Part 13 of GB/T 13747 "Chemical analysis methods for zirconium and zirconium alloys". This series of standards aims to standardize the chemical composition detection methods of zirconium and its alloys to ensure the reliability of product quality and application areas.
2. Scope of application of the standard
This part is applicable to the determination of lead content in sponge zirconium, zirconium and zirconium alloys, with a determination range of $0.0005\% \sim 0.030\%$. High-sensitivity detection is achieved through polarography.
Comparison of Analytical Methods
| Determination Items | GB/T 13747.13—2017 | GB/T 13747.13—1992 | Main Improvements |
|---|---|---|---|
| Determination Method | Polarography | Oscillopolarography | Optimization of Instrument Detection Limit and Improvement of Resolution |
| Sample Treatment | Hydrofluoric Acid Dissolution + Ammonium Citrate Masking | Direct Dissolution Method | Added Sample Clauses and Optimized Treatment Steps |
| Determination Range | $0.0005\% \sim 0.030\% | $0.001\% \sim 0.010\% | Extended high content detection range |
Implementation suggestions and precautions
Laboratory conditions:It is recommended to use a new polarographic analyzer equipped with a dropping mercury electrode and a high-precision mercury pool anode.
Reagent preparation:Ensure that all reagents are of high purity, especially key reagents such as hydrofluoric acid and ammonium citrate.
Operation points:
- Pay attention to protection when dissolving the sample, as hydrofluoric acid is highly corrosive.
- High-purity nitrogen needs to be introduced before polarographic analysis to eliminate interference.
- Operate in strict accordance with the requirements for drawing the standard curve.
Precision and allowable error.
| Mass fraction of lead/% | Repeatability limit/% | Allowable error/% |
|---|---|---|
| 0.0005~0.0015 | 0.0003 | 0.0006 |
| >0.0015~0.0050 | 0.0006 | 0.0015 |
| >0.0050~0.010 | 0.0015 | 0.0030 |
| >0.010~0.030 | 0.0030 | - |
Significance of Standard Implementation
The release and implementation of this standard not only improves the accuracy of the detection of lead content in zirconium and zirconium alloys, but also optimizes the experimental process and reduces the analysis cost. It is of great significance to ensure the quality of zirconium materials used in aerospace, nuclear industry and other fields.
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