GB/T 4698.4-2017 in English
VALIDMethods for chemical analysis of titanium sponge,titanium and titanium alloys-Part 4:Determination of manganese content-Potassium periodate spectrophotometry and inductively coupoled 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 4698.4-2017海绵钛、钛及钛合金化学分析方法 第4部分：锰量的测定 高碘酸盐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
GB/T 4698.4—2017 Standard Overview
This standard specifies the determination method of manganese content in titanium sponge, titanium and titanium alloys, including periodate spectrophotometry and inductively coupled plasma atomic emission spectrometry. It is applicable to samples with a manganese content range of $0.005\% \sim 3.00\%$.
Comparison of two determination methods
| Method name | Scope of application | Operation steps | Precision | Equipment requirements |
|---|---|---|---|---|
| Periodate spectrophotometry | Applicable to manganese content range $0.005\% \sim 3.00\%$, especially suitable for the determination of medium and low content. | The sample is dissolved in hydrofluoric acid and sulfuric acid, titanium is oxidized by nitric acid, manganese is oxidized by potassium periodate, and the absorbance is measured at a wavelength of $525~\mathrm{nm}$. | - Repeatability limit $r$: $0.001\% \sim 0.10\% | Spectrophotometer |
| Inductively coupled plasma atomic emission spectrometry | Applicable to the manganese content range of $0.005\% \sim 3.00\%$, suitable for accurate determination of high content. | The sample is dissolved in hydrochloric acid and hydrofluoric acid, and the mass concentration of manganese is determined at a wavelength of $257.610~\mathrm{nm}$ using an inductively coupled plasma atomic emission spectrometer. | - Repeatability limit $r$: $0.001\% \sim 0.09\% | Inductively coupled plasma atomic emission spectrometer |
Method principle and steps
Periodate spectrophotometry
After the sample is dissolved, manganese (II) is oxidized to manganese (VI) through oxidation reaction, and its characteristic absorption at $525~\mathrm{nm}$ is used for quantitative analysis. This method is simple to operate, but it interferes with certain impurity elements such as chromium.
Inductively coupled plasma atomic emission spectrometry
After the sample is dissolved, the sample is introduced into the plasma using a hydrofluoric acid atomizer system to excite the characteristic spectrum line of manganese ($257.610~\mathrm{nm}$), and the manganese content is quantitatively determined by detecting its emission intensity. This method has high sensitivity and high degree of automation.
Background of Standard Formulation and Analysis of Technical Evolution
This standard replaces GB/T 4698.4—1996 and GB/T 4698.20—1996. The main technical improvements include:
- Delete reference standards
- Add sample clauses and precision clauses
- Introduce inductively coupled plasma atomic emission spectrometry
- Add test report clauses
Implementation suggestions
1. Select the appropriate method according to the actual range of manganese content in the sample:
- If the manganese content is low ($0.005\% \sim 0.10\%$), it is recommended to use periodate spectrophotometry.
- If the manganese content is high ($0.10\% \sim 3.00\%$), it is recommended to use inductively coupled plasma atomic emission spectrometry to obtain higher accuracy.
2. When using periodate spectrophotometry, pay attention to the interference of chromium and perform corrections according to standard procedures.
3. Inductively coupled plasma atomic emission spectrometry is suitable for situations that require high sensitivity and automated analysis, but the maintenance of the equipment and the purity of the argon gas must be ensured.
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