Standard No.:	GB/T 223.77-1994
Chinese Name:	钢铁及合金化学分析方法 火焰原子吸收光谱法测定钙量
English Name:	Methods for chemical analysis of iron, steel and alloy The flame atomic absorption spectrometric method for the determination of calcium content
Professional Classification:	H11 Steel and iron alloy analysis method
Professional Classification:	GB National Standard
ICS Classification:	77.080
Issued by:
Issued on:	1994-01-17
Implemented on:	1994-10-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:
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1 Subject Content and Application Scope

This Standard specifies a flame atomic absorption spectrometric method for the determination of the calcium content.
This Standard is applicable to the determination of calcium content in cast iron, carbon steel, alloy steel and high temperature alloy. Determination range: 0.0005%~0.010%.

2 Principle

The sample is dissolved with hydrochloric acid and nitric acid, add strontium dichloride as interference rejection agent, spray the sample solution into nitrous oxide - acetylene flame, apply calcium hollow cathode lamp as the light source and measure the absorbance at the wavelength 422.7 nm of atomic absorption spectrometer.