GB/T 20975.9-2020 English PDFUS$189.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 20975.9-2020: Methods for chemical analysis of aluminium and aluminium alloys - Part 9: Determination of lithium content--Flame atomic absorption spectrometry Status: Valid GB/T 20975.9: Historical versions
Similar standardsGB/T 20975.29 GB/T 20975.28 GB/T 20975.30 GB/T 20975.13 GB/T 20975.14 GB/T 20975.12Basic dataStandard ID: GB/T 20975.9-2020 (GB/T20975.9-2020)Description (Translated English): Methods for chemical analysis of aluminium and aluminium alloys - Part 9: Determination of lithium 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77.120.10 Word Count Estimation: 10,187 Date of Issue: 2020-06-02 Date of Implementation: 2021-04-01 Older Standard (superseded by this standard): GB/T 20975.9-2008 Quoted Standard: GB/T 8005.2; GB/T 8170-2008 Issuing agency(ies): State Administration for Market Regulation, China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 lithium content in aluminum and aluminum alloys by flame atomic absorption spectrometry. This standard is applicable to the arbitration determination of lithium content in aluminum and aluminum alloys. GB/T 20975.9-2020: Methods for chemical analysis of aluminium and aluminium alloys - Part 9: Determination of lithium content--Flame atomic absorption 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 aluminium and aluminium alloys--Part 9.Determination of lithium content--Flame atomic absorption spectrometry ICS 77.120.10 H12 National Standards of People's Republic of China Replace GB/T 20975.9-2008 Chemical analysis methods of aluminum and aluminum alloys Part 9.determination of lithium 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 ForewordGB/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 9 of GB/T 20975. This section was drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 20975.9-2008 "Methods for Chemical Analysis of Aluminum and Aluminum Alloys Part 9.Determination of Lithium Content Flame Origin Compared with GB/T 20975.9-2008, the main technical changes except for editorial changes are as follows. --- Added standard use safety warnings; ---Modified the measurement range from 0.002%~3.00% to 0.0020%~12.00% (see Chapter 1,.2008 edition Chapter 1); --- Added "Normative Reference Documents" (see Chapter 2); --- Added "Terms and Definitions" (see Chapter 3); ---Added the requirements for reagents and water used in analysis (see Chapter 5); ---Modified the sample solution preparation steps (see 8.4.3, 6.4.3 of the.2008 edition); ---Modified the preparation steps of the standard curve (see 8.5.1, 6.5.1 of the.2008 edition); ---Modified "Precision" (see Chapter 10, Chapter 8 of the.2008 edition); --- Deleted "quality control and assurance" (see Chapter 9 of the.2008 edition); --- Added "Test Report" (see Chapter 11). 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. Southwest Aluminum (Group) Co., Ltd., Non-ferrous Metal Technology and Economic Research Institute, Northeast Light Alloy Co., Ltd. Company, Changsha Research Institute of Mining and Metallurgy Co., Ltd., Guizhou Institute of Analysis and Testing, South China University of Technology, Beijing Nonferrous Metals and Rare Earth Applications Research Institute, Hebei Sitong New Metal Materials Co., Ltd. The main drafters of this section. Tan Haiyan, Tan Jiaying, Xi Huan, Xie Xi, Yi Jia, Li Song, Hu Xinchi, Dai Fengying, Wang Andi, Yanfengbo, Xu Haiyan, Lou Yue, Shi Yu, Zhou Bing. The previous versions of the standard replaced by this part are. ---GB/T 6987.26-2001; ---GB/T 20975.9-2008. Chemical analysis methods of aluminum and aluminum alloys Part 9.determination of lithium 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 ScopeThis part of GB/T 20975 specifies the flame atomic absorption spectrometry to determine the lithium content in aluminum and aluminum alloys. This section applies to the arbitration determination of lithium content in aluminum and aluminum alloys, the measurement range. 0.0020% to 12.00%.2 Normative referencesThe 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 values3 Terms and definitionsThe terms and definitions defined in GB/T 8005.2 apply to this document.4 Method summaryThe sample is dissolved in hydrochloric acid, hydrogen peroxide and nitric acid, at a wavelength of 670.8nm in a flame atomic absorption spectrometer, with air-acetylene lean The flame measures the absorbance of lithium to determine the lithium content.5 ReagentsUnless otherwise stated, only reagents and laboratory secondary water confirmed to be analytically pure are used in the analysis. 5.1 Pure aluminum (wAl≥99.99%, wLi≤0.0005%). 5.2 Nitric acid (ρ=1.42g/mL). 5.3 Hydrofluoric acid (ρ=1.14g/mL). 5.4 Hydrogen peroxide (ρ=1.10g/mL). 5.5 Hydrochloric acid (1 1). 5.6 Nitric acid (1 9). 5.7 Sulfuric acid (1 1). 5.8 Aluminum solution A (20mg/mL). Weigh 20.00g pure aluminum (5.1) into a 1000mL beaker, and add a total of 600mL salt in batches Acid (5.5), cover with a watch glass, after the violent reaction stops, add a few drops of hydrogen peroxide (5.4), slowly heat until completely dissolved, and steam until the salt is out Now, cool slightly, add 600mL nitric acid (5.6), heat until the salt is completely dissolved, and cool to room temperature. Transfer the solution into a 1000mL volumetric flask, Dilute to the mark with water and mix well. 5.9 Aluminum solution B (1mg/mL). Pipette 25.0mL aluminum solution A (5.8) in a 500mL volumetric flask, dilute to the mark with water, and mix. 5.10 Lithium standard storage solution. use a certified standard solution for preparation first. Or weigh 5.3228g lithium carbonate [w(Li2CO3)≥99.99%] In a 500mL beaker, cover with a watch glass, slowly add 125mL nitric acid (5.6), heat until completely dissolved, boil for a few minutes, and cool to room temperature. Transfer the solution to a 1000mL volumetric flask, dilute to the mark with water, and mix. This solution 1mL contains 1.0mg lithium. 5.11 Lithium standard solution. Pipette 10.00mL lithium standard stock solution (5.10) into a 1000mL volumetric flask, dilute to the mark with water, and mix. uniform. This solution 1mL contains 10μg lithium.6 InstrumentsAtomic absorption spectrometer with lithium hollow cathode lamp. The instrument should meet the following conditions. ---Characteristic concentration. In a solution consistent with the matrix of the measurement sample solution, the characteristic concentration of lithium should not be greater than 0.018μg/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 solution) to measure the absorbance 10 times, and the standard deviation should not exceed the highest concentration 0.5% of the average absorbance of the standard solution; ---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 SampleProcess the sample into chips with a thickness of not more than 1mm.8 Analysis steps8.1 Sample Weigh a mass (m) of 0.50g sample (Chapter 7), accurate to 0.0001g. 8.2 Parallel test Do two tests in parallel and take the average value. 8.3 Blank test Weigh 0.50g pure aluminum (5.1) instead of the sample (8.1), and do a blank test with the sample. 8.4 Determination 8.4.1 Place the sample (8.1) in a 250mL beaker, add 15mL hydrochloric acid (5.5) in portions, cover with a watch glass, and wait for the violent reaction to stop. Add a few drops of hydrogen peroxide (5.4), slowly heat until the sample is dissolved, steam until the salt appears, cool slightly, add 15mL nitric acid (5.6), and heat to the salt The class is completely dissolved and cooled to room temperature. 8.4.2 If there is insoluble matter, filter and wash. Put the residue and filter paper in a platinum crucible, ash (do not burn the filter paper), and burn at about 550°C. Cool, add 2mL sulfuric acid (5.7), 5mL hydrofluoric acid (5.3), and add nitric acid (5.2) dropwise until the solution is clear, heat and evaporate to dryness. Burn at 700°C for a few minutes, cool to room temperature, and dissolve the residue with as little nitric acid (5.6) as possible (filter if necessary). Combine this solution as it is In the product solution. 8.4.3 According to Table 1, transfer the sample solution (including the combined sample solution after treating insoluble matter) into the corresponding volumetric flask (V0), and dilute with water to When the mass fraction of lithium is greater than 0.10%, transfer the corresponding volume (V1) of the test solution into the corresponding volumetric flask (V2), and dilute with water until the Degree, mix well. 8.4.4 At 670.8nm wavelength of flame atomic absorption spectrometer, use air-acetylene lean flame, adjust zero with water, and measure blank test (8.3) and the absorbance of lithium in the sample solution (8.4.3), and find the mass concentration (ρ0) of the blank test lithium and the lithium in the sample solution from the working curve The mass concentration (ρ). 8.5 Drawing of working curve 8.5.1 According to the lithium mass fraction, the preparation of the working curve series standard solution is divided into 5 types. a) When the mass fraction of lithium is 0.0020%~0.020%. pipette 0mL, 1.00mL, 2.00mL, 4.00mL, 6.00mL, 8.00mL, 10.00mL lithium standard solution (5.11), put them in a set of 100mL volumetric flasks, add 25mL aluminum solution A (5.8), use Dilute with water to the mark and mix well; b) When the mass fraction of lithium is >0.020%~0.10%. pipette 0mL, 2.00mL, 4.00mL, 6.00mL, 8.00mL, 10.00mL Lithium standard solution (5.11), put them in a set of 100mL volumetric flasks, add 5mL aluminum solution A (5.8) to each, dilute with water to Degree, mixing; c) When the mass fraction of lithium is >0.10%~0.50%. pipette 0mL, 2.00mL, 4.00mL, 6.00mL, 8.00mL, 10.00mL lithium Standard solution (5.11), put in a set of 100mL volumetric flasks, add 1mL aluminum solution A (5.8) to each, dilute to the mark with water, Mix well; d) The mass fraction of lithium is >0.50%~5.00%. pipette 0mL, 1.00mL, 2.00mL, 4.00mL, 6.00mL, 8.00mL, 10.00mL lithium standard solution (5.11), respectively placed in a set of 100mL volumetric flasks, each add 2mL aluminum solution B (5.9), Dilute with water to the mark and mix well; e) The mass fraction of lithium is >5.00%~12.00%. pipette 0mL, 5.00mL, 6.00mL, 8.00mL, 10.00mL, 12.00mL lithium Standard solution (5.11), put in a set of 100mL volumetric flasks, add 1mL aluminum solution B (5.9) to each, dilute to the mark with water, Mix well. 8.5.2 Under the same conditions as the sample solution measurement, put the series of standard solutions (8.5.1) at 670.8nm wavelength of the atomic absorption spectrometer, and use Air-acetylene lean flame, adjust zero with water, measure the absorbance of a series of standard solutions and "zero concentration" solutions (without lithium standard solution). Using the mass concentration of lithium as the abscissa, the corresponding absorbance (minus the absorbance of the "zero concentration" solution) as the ordinate, draw the working curve.9 Test data processingThe lithium content is calculated as the lithium mass fraction wLi, calculated according to formula (1). When the lithium mass fraction is less than 1.00%, the calculation result retains two significant digits; when the lithium mass fraction is ≥1.00%, the calculation result is expressed to the smallest Count the last two digits. 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 values of two independent test results obtained under repeatability conditions, within the average range given below, these two test results The absolute difference does not exceed the repeatability limit r, and the case of exceeding the repeatability limit r does not exceed 5%. The repeatability limit r is within the linear range according to the data in Table 2. Obtained by interpolation or extension method. 10.2 Reproducibility The measured values of two independent test results obtained under reproducibility conditions, within the average range given below, these two test results 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 is linear according to the data in Table 3 Obtained by interpolation or extension. 11 Test report The test report should give at least the following aspects. 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. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 20975.9-2020_English be delivered?Answer: Upon your order, we will start to translate GB/T 20975.9-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 20975.9-2020_English with my colleagues?Answer: Yes. 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