Standard No.:	GB/T 223.22-1994
Chinese Name:	钢铁及合金化学分析方法 亚硝基R盐分光光度法测量钴量
English Name:	Methods for chemical analysis of iron ,steel and alloy.The nitroso-R-salt spectrophotometric method for the determination of cobalt 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
Replace:	GB223.22-1982
Language:	English
File Format:	PDF
Word Count:	2500 words
Price(USD):	75 (USD)
Delivery:	via email in 1-3 business day

1 Subject Content and Application Scope

This Standard specifies the Nitroso-R-Salt Spectrophotometric Method for the Determination of Cobalt Content.
This Standard is applicable to the determination of cobalt content in pig iron, carbon steel, alloy steel and precision alloy. Determination range: 0.10%~3.00%.

2 Principle

In the presence of ammonium citrate and sodium nitrite, where the solution pH is 5.5~7.5, the bivalent cobalt is rapidly oxidated to tervalent one, and it and nitroso R salt generate colored complex, and measure the absorbance after acidification eliminates interference.