GB/T 14849.3-2007: Industrial silicon chemical analysis -- Part 3: Determination of calcium content

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Scope

This Method specifies the method for determination of calcium content in silicon metal.
This Method applies to the determination of calcium content in silicon metal.
Determination range (mass fraction). 0.020%~0.30%.
2  Method summary
The specimen is decomposed with hydrofluoric acid and nitric acid. Perchloric acid’s
smoking removes silicon, fluorine, etc. And the residue is dissolved with hydrochloric acid.
Lanthanum salt is used to control the interference of aluminum. Determine the
absorbance of calcium by air-acetylene flame, at flame atomic absorption spectrometry
wavelength of 422.7nm.

Basic Data

Standard ID	GB/T 14849.3-2007 (GB/T14849.3-2007)
Description (Translated English)	Industrial silicon chemical analysis -- Part 3: Determination of calcium content
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H12
Classification of International Standard	77.120.10
Word Count Estimation	8,899
Date of Implementation	2008-04-01
Older Standard (superseded by this standard)	GB/T 14849.3-1993
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 determination of the calcium content of the silicon industry.