GB/T 14849.2-2007 PDF EnglishUS$90.00 · In stock · Download in 9 seconds
GB/T 14849.2-2007: Methods for chemical analysis of silicon metal -- Part 2: Determination of aluminium content -- Chrome azurol S spectrophotometric method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 14849.2: Historical versions
Similar standardsGB/T 14849.2-2007: Methods for chemical analysis of silicon metal -- Part 2: Determination of aluminium content -- Chrome azurol S spectrophotometric method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14849.2-2007 GB ICS 77.120.10 H 12 NATIONAL STANDARD Replacing GB/T 14849.2-1993 Methods for chemical analysis of silicon metal - Part 2.Determination of aluminum content - Chrome azurol S spectrophotometric method Issued on. OCTOBER 25, 2007 Implemented on. APRIL 1, 2008 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Committee of Standardization Administration of the PRC. Table of ContentsForeword... 3 1 Scope... 4 2 Method summary... 4 3 Reagents... 4 4 Instruments... 5 5 Sample... 5 6 Analytical steps... 5 7 Calculation of the analysis results... 6 8 Precision... 7 9 Quality assurance and control... 7ForewordGB/T 14849 Methods for Chemical Analysis of Silicon Metal is divided into 4 parts. — Part 1.Determination of iron content - 1, 10-phenanthroline spectrophotometric method; — Part 2.Determination of aluminum content - chrome azurol-S spectrophotometric method; — Part 3.Determination of calcium content - flame atomic absorption spectrometry, chlorophosphonazo I spectrophotometric method; — Part 4.Inductively coupled plasma-atomic emission spectrometry to determine element content. This is Part 2 of GB/T 14849. This Part will replace GB/T 14849.2-1993 Silicon metal - Determination of aluminium content--Chrome azurol S spectrophotometric method. Compared with GB/T 14849.2-1993, the main changes are as follows. — “Repeatability” and “quality assurance and control” is added. This Part was proposed by China Nonferrous Metals Industry Association. This Part shall be under the jurisdiction of the National Technical Committee on Nonferrous Metals of Standardization. This Part was responsibly drafted by Fushun Aluminium Co., Ltd. Main drafters of this Part. Xu Tieling, Ji Chunlei, Yang Yuhong, and Xu Tieling. The previous version of the standard replaced by this Part is as follows. — GB/T 14849.1-1993. Methods for chemical analysis of silicon metal - Part 2. Determination of aluminum content - Chrome azurol S spectrophotometric method1 ScopeThis Part specifies the method for determination of aluminum content in silicon metal. This Part applies to the determination of aluminum content in silicon metal. Determination range (mass fraction). 0.02%~0.30%.2 Method summaryThe specimen is decomposed with hydrofluoric acid and nitric acid. Sulfuric acid’s smoking removes silicon, fluorine, etc. The residue is dissolved with hydrochloric acid. Ascorbic acid is used to mask the interference of ferrum. A purplish-red complex compound is formed by the aluminum and chrome azurol-S, in hexamethylenetetramine medium of pH5.5-6.1.At wavelength of 510nm of the spectrophotometer, MEASURE the absorbance.3 Reagents3.1 Hydrofluoric acid (ρ1.14g/mL). 3.2 Nitric acid (1+1). 3.3 Sulfuric acid (1+1). 3.4 Hydrochloric acid (1+1). 3.5 Ascorbic acid solution (10g/L). Prepare it when use. 3.6 Hexamethylenetetramine solution (300g/L). 3.7 Chrome azurol S acetic acid solution (0.3g/L). WEIGH 0.30g of chrome azurol-S and PUT into a beaker. ADD 25mL of water and 25mL of anhydrous alcohol. After dissolved, ADD 475mL of water. USE anhydrous alcohol to dilute to 1000mL. MIX evenly. 3.9 Aluminum standard solution. PITETTE 10.00mL of aluminum standard storage solution (3.8) into a 500mL volumetric flask.4 InstrumentsSpectrophotometer.5 SampleThe test sample shall all pass through 0.149mm standard sieve. And USE magnet to remove iron powder.6 Analytical steps6.1 Specimen WEIGH 1g of the test sample (5), accurate to 0.0001g. 6.2 Determination number of times PERFORM twice independent determinations and TAKE the average values. 6.3 Blank test MAKE a blank test along with the specimen (6.1). 6.4 Determination 6.4.1 The specimen (6.1) is put in 100mL platinum dish. ADD 0.5mL of sulphuric acid (3.3) and 20mL-25mL of hydrofluoric acid (3.1). 6.5 Drawing of working curve 6.5.1 PIPETTE blank test solution (6.3) that is equal to the volume of the test solution B. according to Table 1.Respectively PLACE into a set of 100mL volumetric flasks. Then respectively ADD 0mL, 1.00mL, 2.00mL, 3.00mL, 4.00mL, and 5.00mL of standard aluminum solution (3.9). 6.5.2 TAKE the mass of aluminum as the abscissa; absorbance as ordinate; DRAW the working curve.7 Calculation of the analysis resultsCALCULATE the mass fraction of aluminum (w) by Formula (1), values expressed in %.8 Precision8.1 Repeatability Under the repeatability condition, within the range of average value given as follows, for the determination values obtained from 2 independent test results, the absolute values of these 2 test results shall not exceed repeatability limit (r). 8.2 Allowable difference The difference value of analysis results among the laboratories shall not exceed the allowable difference listed in Table 3.9 Quality assurance and controlIt shall use national standard sample or industry-level standard sample. CHECK the validity of the analytical method standard every 6 months. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 14849.2-2007 be delivered?Answer: The full copy PDF of English version of GB/T 14849.2-2007 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 14849.2-2007_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 14849.2-2007_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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