Standard No.:	GB/T 223.21-1994
English Name:	Methods for chemical analysis of iron steel and alloy.The 5-CL-PADAB spectrophotometric method for the determination of cobalt content
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
Chinese Classification:	H11    Steel and iron alloy analysis method
Professional Classification:	GB    National Standard
Issued by:	AQSIQ
Issued on:	1994-1-17
Implemented on:	1994-10-1
Status:	valid
Superseding:	GB 223.21-1982 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:	2000 words
Price(USD):	40.00
Delivery:	via email in 1 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.

1 Subject Content and Application Scope
2 Principle
3 Reagent
4 Analytical Procedures
5 Calculation of Analysis Results
6 Precision
Appendix A Source Data of Precision Test (Additional)
Additional Explanations