GB/T 14849.1-2007: Methods for chemical analysis of silicon metal -- Part 1: Determination of iron content - 1, 10-phenanthrolion spectrophotometric method

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Scope

This Part specifies the method for determination of iron content in silicon metal.
This Part is applicable to the determination of iron content in silicon metal. Determination
range (mass fraction). 0.10%~0.65%.
2  Method summary
The specimen is decomposed with hydrofluoric acid and nitric acid. Sulfuric acid’s
smoking removes silicon, fluorine, etc. And the residue is dissolved with hydrochloric acid.
USE hydroxylamine hydrochloride to reduce Fe (III) to Fe (II). In sub-acid medium of
pH3-5, iron and 1, 10-phenanthroline form red complex compound. At wavelength of
510nm of the spectrophotometer, MEASURE the absorbance.

Basic Data

Standard ID	GB/T 14849.1-2007 (GB/T14849.1-2007)
Description (Translated English)	Methods for chemical analysis of silicon metal -- Part 1: Determination of iron content - 1, 10-phenanthrolion spectrophotometric method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H12
Classification of International Standard	29.045
Word Count Estimation	6,613
Date of Issue	2007-10-25
Date of Implementation	2008-04-01
Older Standard (superseded by this standard)	GB/T 14849.1-1993
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 iron content in the silicon industry. This section applies to methods of industrial silicon iron content. Measuring range (mass fraction): 0. 10% to 0. 65 %.