GB/T 38513-2020 English PDF

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GB/T 38513-2020: Methods for chemical analysis of niobium hafnium alloys - Determination of hafnium, titanium, zirconium, tungsten, tantalum contents - Inductively coupled plasma atomic emission spectrometry
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38513-2020	189	Add to Cart	3 days	Methods for chemical analysis of niobium hafnium alloys - Determination of hafnium, titanium, zirconium, tungsten, tantalum contents - Inductively coupled plasma atomic emission spectrometry	Valid

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Basic data

Standard ID: GB/T 38513-2020 (GB/T38513-2020)
Description (Translated English): Methods for chemical analysis of niobium hafnium alloys - Determination of hafnium, titanium, zirconium, tungsten, tantalum contents - Inductively coupled plasma atomic emission spectrometry
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H14
Classification of International Standard: 77.120.99
Word Count Estimation: 10,160
Date of Issue: 2020-03-06
Date of Implementation: 2021-02-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the method for the determination of hafnium (Hf), titanium (Ti), zirconium (Zr), tungsten (W) and tantalum (Ta) in niobium-hafnium alloys by inductively coupled plasma atomic emission spectrometry. This standard is applicable to the determination of hafnium, titanium, zirconium, tungsten, and tantalum in niobium-hafnium alloys. The determination range is shown in Table 1.

GB/T 38513-2020: Methods for chemical analysis of niobium hafnium alloys - Determination of hafnium, titanium, zirconium, tungsten, tantalum contents - Inductively coupled plasma atomic emission spectrometry

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods for chemical analysis of niobium hafnium alloys - Determination of hafnium, titanium, zirconium, tungsten, tantalum contents - Inductively coupled plasma atomic emission spectrometry ICS 77.120.99 H14 National Standards of People's Republic of China Niobium-hafnium alloy chemical analysis method Determination of hafnium, titanium, zirconium, tungsten, tantalum and other elements. Inductively coupled plasma atomic emission spectrometry 2020-03-06 released 2021-02-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by China Nonferrous Metals Industry Association. This standard is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243). Drafting organizations of this standard. Xi'an Hantang Analysis and Testing Co., Ltd., Nonferrous Metal Technology and Economic Research Institute, Baoti Group Co., Ltd., Ningxia Oriental Tantalum Co., Ltd., Northwest Nonferrous Metal Research Institute, National Standard (Beijing) Inspection and Certification Co., Ltd. The main drafters of this standard. Liu Houyong, Yang Junhong, Zhang Jiangfeng, Zhao Huanjuan, Jia Menglin, Lei Xiaoyan, Zhang Junfeng, Wang Changhua, Lu Ni, Li Jian, Mo Shumin and Li Jidong. Niobium-hafnium alloy chemical analysis method Determination of hafnium, titanium, zirconium, tungsten, tantalum and other elements Inductively coupled plasma atomic emission spectrometry

1 Scope

This standard specifies the determination of hafnium (Hf), titanium (Ti), zirconium (Zr), and zirconium (Zr) in niobium-hafnium alloys by inductively coupled plasma atomic emission spectrometry. Method of tungsten (W) and tantalum (Ta) content. This standard applies to the determination of hafnium, titanium, zirconium, tungsten, and tantalum content in niobium-hafnium alloys. The measurement range is shown in Table 1. Table 1 Measuring range of the content of each element in the niobium-hafnium alloy

2 Principle

The sample is dissolved with hydrofluoric acid and nitric acid, and an inductively coupled plasma atomic emission spectrometer is used to measure the test at the recommended analysis line wavelength. The emission intensity of each element in the liquid, the mass concentration of each element is obtained from the working curve, and the content of each element is calculated.

3 reagent

Unless otherwise specified, only reagents and laboratory secondary water confirmed to be pure superior grade are used in the analysis. 3.1 Nitric acid (ρ=1.42g/mL). 3.2 Hydrofluoric acid (ρ=1.13g/mL). 3.3 Hydrochloric acid (ρ=1.19g/mL). 3.4 Niobium metal (wNb≥99.95%). 3.5 Titanium standard solution. accurately weigh 0.1000g of metallic titanium (wTi≥99.99%) into a 100mL polytetrafluoroethylene beaker and add 10mL water, 5mL hydrochloric acid (3.3), 2mL hydrofluoric acid (3.2), 1mL nitric acid (3.1), dissolve, cool, transfer into a 100mL plastic volumetric flask Dilute to the mark with water and mix well. 1mL of this solution contains 1mg of titanium. 3.6 Zirconium standard solution. Weigh 0.1000g of metallic zirconium (wZr≥99.99%) into a 100mL PTFE beaker, add 10mL of water, 2mL hydrofluoric acid (3.2), 1mL nitric acid (3.1), dissolve, cool, transfer into a 100mL plastic volumetric flask, dilute to the mark with water, and mix. This solution 1mL contains 1mg zirconium. 3.7 Tungsten standard solution. Weigh 0.1000g metallic tungsten (wW≥99.95%) into a 100mL PTFE beaker, add 10mL nitrate Acid (3.1), 3mL hydrofluoric acid (3.2), dissolve, cool, transfer to a 100mL plastic volumetric flask, dilute to the mark with water, and mix. This solution 1mL contains 1mg tungsten. 3.8 Tantalum standard solution. Weigh 0.1000g metallic tantalum (wTa≥99.99%) into a 100mL polytetrafluoroethylene beaker, add 5mL nitric acid (3.1), add 5 mL of hydrofluoric acid (3.2) in portions, cover with a PTFE watch glass, heat to dissolve at low temperature, cool, and transfer to a 100 mL plastic container In a measuring flask, dilute to the mark with water and mix well. 1mL of this solution contains 1mg of tantalum. 3.9 Hafnium standard solution. Weigh 0.1000g metal hafnium (wHf≥99.99%) into a 100mL PTFE beaker, add 10mL water, 2mL of hydrofluoric acid (3.2), dissolve, cool, transfer to a 100mL plastic volumetric flask, dilute to the mark with water, and mix. This solution 1mL contains 1mg hafnium.

4 Equipment

4.1 Inductively coupled plasma atomic emission spectrometer. with hydrofluoric acid resistant sampling system, resolution less than 0.006nm (200nm). 4.2 The recommended analysis line wavelength of each element is shown in Table 2. Table 2 Recommended analysis line wavelength of each element

5 samples

Process the sample into chips with a length not greater than 5mm.

6 Test procedure

6.1 Sample Weigh 0.20g sample (Chapter 5), accurate to 0.0001g. 6.2 Parallel test Do two tests in parallel and take the average value. 6.3 Blank test Weigh the metal niobium (3.4) of the same quality as the sample, and do a blank test with the sample. 6.4 Preparation of analysis test solution 6.4.1 Preparation of analysis test solution A Place the sample (6.1) in a 150mL polytetrafluoroethylene beaker, add 10mL water, 2mL hydrofluoric acid (3.2), 5mL nitric acid (3.1), Heat in a water bath, wait for the sample to dissolve completely, cool it, transfer it to a 100mL plastic volumetric flask, dilute to the mark with water, and shake well. 6.5 Preparation of working curve solution 6.5.1 Preparation of working curve standard solution A Weigh 0.20g of metallic niobium (3.4) into a set of 150mL PTFE beakers, and dissolve them according to step 6.4.1.After cooling Transfer to a set of 100mL plastic volumetric flasks, add standard solutions of titanium, zirconium, tungsten, and tantalum according to Table 3, dilute to the mark with water, and shake well. Table 3 The addition amount of each element standard solution in the working curve 6.5.2 Preparation of working curve standard solution B Weigh 0.20g of metallic niobium (3.4) into a 150mL PTFE beaker, dissolve it according to step 6.4.1, and transfer it after cooling. In a 100mL plastic volumetric flask, dilute with water to the mark. After mixing, pipette 10.00mL into a set of plastic volumetric flasks, and add hafnium according to Table 3. Standard solution, respectively add 2mL hydrofluoric acid (3.2), dilute to the mark with water, shake. 6.6 Determination Introduce the working curve solution into the inductively coupled plasma atomic emission spectrometer. According to the best measurement conditions of the instrument selected for the experiment, select At the specified wavelength, determine the emission intensity of each element in the series of working curve solutions. When the linear correlation coefficient of the working curve is ≥0.999, it can be Analyze the measurement of the test solution, and the computer automatically gives the mass concentration of each element according to the relationship between light intensity and concentration.

7 Test data processing

The content of each element is calculated as the mass fraction wx and calculated according to formula (1).

8 Precision

8.1 Repeatability The measured values of two independent test results obtained under repeatability conditions are within the range of the average value given in Table 4. The absolute difference does not exceed the repeatability limit (r), and the case of exceeding the repeatability limit (r) does not exceed 5%. Repeatability limit (r) is linear according to the data in Table 4 Obtained by interpolation or extension. Table 4 Repeatability limits 8.2 Reproducibility The measured values of two independent test results obtained under reproducibility conditions are within the range of the average value given in Table 5. The absolute difference does not exceed the reproducibility limit (R), and the case of exceeding the reproducibility limit (R) does not exceed 5%. Reproducibility limit (R) adopts the line according to the data in Table 5 Obtained by sexual interpolation or extension method. Table 5 Reproducibility limits

9 Test report

The test report should give at least the following aspects. ---Test object; ---This standard number (note the date); --- Anomalies observed; ---Test date. ......

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