GB/T 4698.8-2017 in English
VALIDMethods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 8: Determination of aluminum content - Separation with sodium hydroxide-EDTA complex-metric titration and inductively coupled plasma atomic emission spectrometry
- Issued on:2017-09-29
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 4698.8-2017海绵钛、钛及钛合金化学分析方法 第8部分：铝量的测定 碱分离-EDTA络合滴定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
Introduction
GB/T 4698.8—2017 "Chemical analysis methods for titanium sponge, titanium and titanium alloys Part 8: Determination of aluminum content" is an important national standard applicable to the precise measurement of aluminum content in a variety of materials. This article will deeply interpret the technical specifications of the standard and provide professional analysis.
Background of standard formulation
With the widespread application of titanium and titanium alloys in aerospace, medical and industrial fields, accurate control of their chemical composition has become essential. Aluminum, as a key element in titanium alloys, directly affects the performance of materials. Therefore, it is of great significance to formulate a unified determination method.
Technology evolution analysis
Compared with the 1996 version of the standard, GB/T 4698.8—2017 introduced a new inductively coupled plasma atomic emission spectrometry (ICP-AES) and retained the classic alkali separation-EDTA complexometric titration method. This update reflects the advancement of technology and the expansion of the scope of application.
Comparison of standard frameworks
| Standard dimensions | 1996 edition | 2017 edition |
|---|---|---|
| Measurement range | 0.80%～8.50% | Method 1: 0.80%～8.50%, Method 2: 0.010%～8.50% |
| Main methods | Alkali separation-EDTA complexometric titration | Newly added inductively coupled plasma atomic emission spectrometry (ICP-AES) |
| Precision requirements | Repeatability r≤0.15%, reproducibility R≤0.30% | Method 1: Repeatability r≤0.07%～0.22%, Method 2: Repeatability r≤0.06%～0.22% |
Detailed explanation of analysis method
Method 1: Alkali separation-EDTA complexometric titration
This method uses sodium hydroxide to precipitate interfering elements such as titanium, and uses the complexation of EDTA and aluminum for quantitative analysis. The key steps include sample dissolution, precipitation separation and titration endpoint judgment.
Method 2: Inductively coupled plasma atomic emission spectrometry (ICP-AES)
This method uses hydrochloric acid and hydrofluoric acid to dissolve the sample, combined with ICP technology to achieve quantitative analysis of aluminum. Its advantages are high efficiency and high sensitivity, and it is suitable for the determination of low-content aluminum.
Implementation Suggestions
- Choose the appropriate method:Choose method one or method two according to the concentration range and accuracy requirements of aluminum in the sample to be tested.
- Calibration of reagents and instruments:Ensure that the purity of the reagents used meets the standards and calibrate the instruments regularly to ensure measurement accuracy.
- Blank test:A blank test should be performed when analyzing each batch of samples to eliminate the interference of foreign impurities.
- Data recording and processing:Record the experimental conditions and results in detail, calculate the mass fraction of aluminum strictly according to the standard formula, and retain two decimal places.
Conclusion
GB/T 4698.8—2017 provides a scientific basis and standardized process for the determination of aluminum content in titanium and titanium alloys. The accuracy and reliability of the test results can be ensured by rationally selecting analytical methods and strictly implementing standard requirements.
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