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GB/T 20975.32-2020: Methods for chemical analysis of aluminium and aluminium alloys - Part 32: Determination of bismuth content
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Methods for chemical analysis of aluminium and aluminium alloys - Part 32: Determination of bismuth content
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GB/T 20975.32-2020
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Basic data | Standard ID | GB/T 20975.32-2020 (GB/T20975.32-2020) | | Description (Translated English) | Methods for chemical analysis of aluminium and aluminium alloys - Part 32: Determination of bismuth content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H12 | | Classification of International Standard | 77.120.10 | | Word Count Estimation | 9,943 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-10-01 | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20975.32-2020: Methods for chemical analysis of aluminium and aluminium alloys - Part 32: Determination of bismuth content
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Methods for chemical analysis of aluminium and aluminium alloys-Part 32.Determination of bismuth content
ICS 77.120.10
H12
National Standards of People's Republic of China
Chemical analysis methods of aluminum and aluminum alloys
Part 32.Determination of Bismuth Content
2020-11-19 released
2021-10-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Foreword
GB/T 20975 "Methods for Chemical Analysis of Aluminum and Aluminum Alloys" is divided into 37 parts.
---Part 1.Determination of mercury content;
---Part 2.Determination of arsenic content;
---Part 3.Determination of copper content;
---Part 4.Determination of iron content;
---Part 5.Determination of silicon content;
---Part 6.Determination of cadmium content;
---Part 7.Determination of manganese content;
---Part 8.Determination of zinc content;
---Part 9.Determination of lithium content by flame atomic absorption spectrometry;
---Part 10.Determination of tin content;
---Part 11.Determination of lead content;
---Part 12.Determination of titanium content;
---Part 13.Determination of vanadium content;
---Part 14.Determination of nickel content;
---Part 15.Determination of boron content;
---Part 16.Determination of magnesium content;
---Part 17.Determination of strontium content;
---Part 18.Determination of Chromium Content;
---Part 19.Determination of Zirconium Content;
---Part 20.Determination of Gallium Content Butyl Rhodamine B Spectrophotometry;
---Part 21.Determination of calcium content;
---Part 22.Determination of beryllium content;
---Part 23.Determination of antimony content;
---Part 24.Determination of total rare earth content;
---Part 25.Determination of element content by inductively coupled plasma atomic emission spectrometry;
---Part 26.Determination of carbon content by infrared absorption method;
---Part 27.Determination of cerium, lanthanum and scandium content by inductively coupled plasma atomic emission spectrometry;
---Part 28.Determination of cobalt content by flame atomic absorption spectrometry;
---Part 29.Determination of molybdenum content thiocyanate spectrophotometric method;
---Part 30.Determination of hydrogen content by heating extraction thermal conductivity method;
---Part 31.Determination of phosphorus content molybdenum blue spectrophotometry;
---Part 32.Determination of Bismuth Content;
---Part 33.Determination of potassium content by flame atomic absorption spectrometry;
---Part 34.Determination of sodium content by flame atomic absorption spectrometry;
---Part 35.Determination of Tungsten Content Thiocyanate Spectrophotometric Method;
---Part 36.Determination of silver content by flame atomic absorption spectrometry;
--- Part 37.Determination of Niobium Content.
This part is part 32 of GB/T 20975.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by China Nonferrous Metals Industry Association.
This part is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243).
Drafting organizations of this section. Chinalco Zhengzhou Nonferrous Metals Research Institute Co., Ltd., Guangdong Industrial Analysis and Testing Center, Nonferrous Metals Technology
Economic Research Institute, Northeast Light Alloy Co., Ltd., Guizhou Analysis and Testing Research Institute, Changsha Research Institute of Mining and Metallurgy Co., Ltd., Shenzhen Zhong
Jinlingnan Nonferrous Metals Co., Ltd. Shaoguan Smelter, Shandongnanshan Aluminum Co., Ltd., Youyan Yijin New Materials Co., Ltd., Shanxi
Dongyankuang Light Alloy Co., Ltd., Beikuang Inspection Technology Co., Ltd., Yingkou Zhongwang Aluminum Co., Ltd.
The main drafters of this section. Wu Yuqiang, Zhu Jungang, Xu Jieyu, Xiong Xiaoyan, Xi Huan, Zhou Bing, Liu Yungui, Xiong Fangxiang, Huang Li, Li Yanzhen,
Liu Chaofang, Chen Diangeng, Han Zhengqian, Lu Cheng, Zhang Tianjiao, Chen Yuxia, Shuai Ruicheng, Jiang Chen, Wei Yanqin.
Chemical analysis methods of aluminum and aluminum alloys
Part 32.Determination of Bismuth Content
Warning---The personnel using this section should have practical experience in formal laboratory work. This section does not point out all possible safety issues
question. The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.
1 Scope
This part of GB/T 20975 specifies the potassium iodide spectrophotometric method and Na2EDTA titration method to determine the content of bismuth in aluminum and aluminum alloys.
This section applies to the arbitration determination of bismuth content in aluminum and aluminum alloys. Potassium iodide spectrophotometric determination range. 0.010%~2.50%;
Na2EDTA titration method determination range. >2.50%~11.00%.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 8005.2 Terminology of Aluminum and Aluminum Alloy Part 2.Chemical Analysis
GB/T 8170-2008 Numerical rounding rules and the expression and determination of limit values
3 Terms and definitions
The terms and definitions defined in GB/T 8005.2 apply to this document.
4 Potassium iodide spectrophotometry
4.1 Method summary
The sample is dissolved in sodium hydroxide, hydrogen peroxide is added to decompose the silicide, and acidified with nitric acid. In a sulfuric acid medium, Bi(Ⅲ) and potassium iodide form
It becomes a yellow soluble complex, and its absorbance is measured at a wavelength of 465nm in a spectrophotometer to determine the content of bismuth.
4.2 Reagents
Unless otherwise stated, only reagents and laboratory secondary water confirmed to be analytically pure are used in the analysis.
4.2.1 Hydrogen peroxide (ρ=1.10g/mL).
4.2.2 Sulfuric acid (1 1).
4.2.3 Nitric acid (1 1).
4.2.4 Sodium hydroxide solution (400g/L).
4.2.5 Urea solution (5g/L).
4.2.6 Thiourea solution (100g/L). Weigh 10g of thiourea and dissolve it in 100mL of water, if necessary, filter with quick filter paper (prepared when used).
4.2.7 Potassium iodide solution (200g/L). Weigh 20g potassium iodide and 2g ascorbic acid, and dissolve them in 100mL water (prepared when used).
4.2.8 Bismuth standard storage solution. Weigh 1.0000g metallic bismuth (wBi≥99.99%) into a 300mL beaker, add 50mL nitric acid
(4.2.3), cover with a watch glass, slowly heat to dissolve completely, cool to room temperature, and transfer to a 1000mL volumetric flask (pre-add 50mL nitric acid
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