GB/T 14849.2-2007: Methods for chemical analysis of silicon metal -- Part 2: Determination of aluminium content -- Chrome azurol S spectrophotometric method

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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.

Basic Data

Standard ID	GB/T 14849.2-2007 (GB/T14849.2-2007)
Description (Translated English)	Methods for chemical analysis of silicon metal -- Part 2: Determination of aluminium content -- Chrome azurol S spectrophotometric method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H12
Classification of International Standard	77.120.10
Word Count Estimation	6,653
Date of Implementation	2008-04-01
Older Standard (superseded by this standard)	GB/T 14849.2-1993
Regulation (derived from)	China National Standard Approval Announcement2007 No.12 (Total No.112)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the method for the determination of aluminum in industrial silicon content. Measuring range: 0. 02% to 0. 30 %.