GB/T 14849.2-2007 PDF English
US$90.00 · In stock · Download in 9 secondsGB/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 procedureStatus: Valid GB/T 14849.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 14849.2-2007 | English | 90 |
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Methods for chemical analysis of silicon metal -- Part 2: Determination of aluminium content -- Chrome azurol S spectrophotometric method
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| GB/T 14849.2-1993 | English | 199 |
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Silicon metal. Determination of aluminium content. Chrome azurol S spectrophotometric method
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GB/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 Contents
Foreword... 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... 7
Foreword
GB/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 method
1 Scope
This 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 summary
The 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 Reagents
3.1 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 Instruments
Spectrophotometer.
5 Sample
The test sample shall all pass through 0.149mm standard sieve. And USE magnet to
remove iron powder.
6 Analytical steps
6.1 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 results
CALCULATE the mass fraction of aluminum (w) by Formula (1), values expressed in %.
8 Precision
8.1 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 control
It 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.
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