Standard No.:	GB/T 223.21-1994
Chinese Name:	钢铁及合金化学分析方法 5-CI-PADAB分光光度法测定钴量
English Name:	Methods for chemical analysis of iron steel and alloy.The 5-CL-PADAB 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:	GB223.21-1982 Chemical analysis of iron, steel and alloy--The determination of cobalt by the 5-Cl-PADAB photometric method
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 5-Cl-PADAB spectrophotometric method for determination of cobalt content.
This standard is applicable to the determination of cobalt content in carbon steel and alloy steel. Determination range: 0.0050%~0.50%.

2 Principle

After the sample is dissolved with acid, in the solution of pH 7~8, the coordination compound generated by 5-Cl -PADAB and cobalt is acidified with dilute sulfuric acid, and takes on stable aubergine; measure the absorbance.