GB/T 20975.36-2020 English PDF

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GB/T 20975.36-2020: Methods for chemical analysis of aluminium and aluminium alloys - Part 36: Determination of silver content--Flame atomic absorption spectrometry
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 20975.36-2020	119	Add to Cart	3 days	Methods for chemical analysis of aluminium and aluminium alloys - Part 36: Determination of silver content--Flame atomic absorption spectrometry	Valid

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Basic data

Standard ID: GB/T 20975.36-2020 (GB/T20975.36-2020)
Description (Translated English): Methods for chemical analysis of aluminium and aluminium alloys - Part 36: Determination of silver content--Flame atomic absorption spectrometry
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H12
Classification of International Standard: 77.120.10
Word Count Estimation: 6,699
Date of Issue: 2020-06-02
Date of Implementation: 2021-04-01
Quoted Standard: GB/T 8005.2; GB/T 8170-2008
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the determination of silver content in aluminum and aluminum alloys by flame atomic absorption spectrometry. This standard applies to the arbitration determination of silver content in aluminum and aluminum alloys. Determination range of flame atomic absorption spectrometry: 0.005 0% ~ 2.00%.

GB/T 20975.36-2020: Methods for chemical analysis of aluminium and aluminium alloys - Part 36: Determination of silver content--Flame atomic absorption spectrometry

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Methods for chemical analysis of aluminium and aluminium alloys--Part 36.Determination of silver content--Flame atomic absorption spectrometry ICS 77.120.10 H12 National Standards of People's Republic of China Chemical analysis methods of aluminum and aluminum alloys Part 36.determination of silver content Flame atomic absorption spectrometry 2020-06-02 released Implementation on 2021-04-01 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 spectrophotometric method; ---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 36 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. Guangdong Industrial Analysis and Testing Center, Non-ferrous Metal Technology and Economic Research Institute, Beijing Non-ferrous Metals and Rare Earth Applications Research Institute, Kunming Metallurgical Research Institute, Xi'an Hantang Analysis and Testing Co., Ltd., Guizhou Analysis and Testing Research Institute, Shandong Yankuang Light Alloy Co., Ltd. Company, Shenzhen Zhongjin Lingnan Nonferrous Metals Co., Ltd., Northeast Light Alloy Co., Ltd., Quality and Metrology Supervision and Inspection in Shaoguan City, Guangdong Province Test. The main drafters of this section. Xiong Xiaoyan, Chen Xiaolan, Jiang Jun, Xi Huan, Xu Lijuan, Zhi Fuguo, Liu Weili, Xing Yinjuan, Zhu Ping, Liu Bo, Guo Yanyao, Zhou Bing, Yuan Qi, Wang Jinrong, Zhai Tongde, Long Shangjun, Liu Hao, Tang Lijun, Qiu Weiming. Chemical analysis methods of aluminum and aluminum alloys Part 36.determination of silver content Flame atomic absorption spectrometry Warning---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 flame atomic absorption spectrometry for the determination of silver content in aluminum and aluminum alloys. This section applies to the arbitration determination of silver content in aluminum and aluminum alloys. Flame atomic absorption spectrometry measurement range. 0.0050%~ 2.00%.

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) is used in 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 Method summary

The sample was dissolved with hydrochloric acid and nitric acid. In an acid medium, at the wavelength of 328.1nm of flame atomic absorption spectrometer, air-acetylene fire Flame, measuring the absorbance of silver to determine the silver content.

5 Reagents

Unless otherwise stated, only reagents and laboratory secondary water confirmed to be analytically pure are used in the analysis. 5.1 Hydrochloric acid (ρ=1.19g/mL). 5.2 Nitric acid (ρ=1.42g/mL). 5.3 Hydrochloric acid (1 1). 5.4 Nitric acid (1 1). 5.5 Hydrochloric acid (1 4). 5.6 Silver standard storage solution. weigh 0.5000g silver (wAg≥99.99%) into a 250mL beaker, add 20mL nitric acid (5.4), Cover with a watch glass, heat at low temperature to completely dissolve, remove and cool, transfer to a 500mL volumetric flask, add 40mL nitric acid (5.2), and dilute with water to Scale and mix well. 1mL of this solution contains 1mg of silver. 5.7 Silver standard solution. Pipette 10.00mL silver standard stock solution (5.6) into a.200mL volumetric flask, add 20mL nitric acid (5.2), Dilute to the mark with water and mix well. 1mL of this solution contains 50μg of silver.

6 Instruments

Atomic absorption spectrometer with silver hollow cathode lamp. The instrument should meet the following conditions. ---Characteristic concentration. In a solution consistent with the matrix of the measurement solution, the characteristic concentration of silver should not be greater than 0.03μg/mL. ---Precision. Use the highest concentration of standard solution to measure the absorbance 10 times, and the standard deviation should not exceed 1.0% of the average absorbance; Use the lowest concentration standard solution (not the "zero" concentration standard solution) to measure the absorbance 10 times, and the standard deviation should not exceed the highest The concentration standard solution is 0.5% of the average absorbance. ---Linear working curve. Divide the working curve into five equal sections according to the concentration, the difference between the absorbance difference of the highest section and the absorbance difference of the lowest section The ratio should not be less than 0.70.

7 Sample

Process the sample into chips not larger than 1mm.

8 Analysis steps

8.1 Sample Weigh the sample with a mass (m) of 0.20g (Chapter 7), accurate to 0.0001g. 8.2 Parallel test Do two tests in parallel and take the average value. 8.3 Blank test Do a blank test with the sample (8.1). 8.4 Determination 8.4.1 Place the sample (8.1) in a 100mL beaker, add 20mL of hydrochloric acid (5.3), cover with a watch glass, and after the violent reaction stops, add 1mL of nitric acid (5.2), heat until the sample is dissolved, boil to remove nitrogen oxides, remove, cool to room temperature, add 15mL of hydrochloric acid (5.1). Will melt Transfer the liquid into a 100mL volumetric flask (V0), dilute to the mark with water, and mix. Divide the test solution (V1) into an appropriate volumetric flask (V2) according to Table 1. Dilute hydrochloric acid (5.5) to the mark and mix well. 8.4.2 Using an air-acetylene flame, at the wavelength of 328.1nm of the atomic absorption spectrometer, and at the same time as the series of standard solutions, adjust to zero with water and measure For the absorbance of the blank test solution and the sample solution, the silver concentration in the blank solution (ρ0) and the silver concentration (ρ) in the test solution are measured from the working curve. versus Simultaneous determination of a series of standard solutions. 8.5 Drawing of working curve 8.5.1 Pipette 0mL, 0.20mL, 1.00mL, 2.00mL, 3.00mL, 4.00mL, 5.00mL silver standard solution (5.7), Group 100mL volumetric flask, dilute to the mark with hydrochloric acid (5.5), and mix. 8.5.2 Under the same conditions as the test solution determination, adjust to zero with water, measure the absorbance of the series of standard solutions, and subtract the "zero" concentration in the series of standard solutions. For the absorbance of the solution, use the concentration of silver as the abscissa and the corresponding absorbance as the ordinate to draw a working curve.

9 Test data processing

The silver content is calculated as the silver mass fraction wAg, calculated according to formula (1). When the silver content is less than 1.00%, the calculation result retains two significant digits; when the silver content is ≥1.00%, the calculation result is expressed to two decimal places Bit. The rounding of values shall be implemented in 3.2 and 3.3 of GB/T 8170-2008. 10 Precision 10.1 Repeatability The measured value of two independent test results obtained under repeatability conditions, within the average range given below, these two test results The absolute value of r does not exceed the repeatability limit r, and the repeatability limit r does not exceed 5%. The repeatability limit r is linearly interpolated according to the data in Table 2. Method and extension method. 10.2 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 reproducibility limit R does not exceed 5%. The reproducibility limit R is linear according to the data in Table 3. Obtained by interpolation and extension methods. 11 Test report The test report should include the following. a) Number and name of this part; b) All necessary information about identification of samples, laboratory, analysis date, report date, etc.; c) Express the test results in an appropriate form; d) Abnormal phenomena during the test; e) Signatures of review and approval personnel. ......

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