Standard No.:	GB/T 223.12-1991
Chinese Name:	钢铁及合金化学分析方法 碳酸钠分离--二苯碳酰二 肼光度法测定铬量
English Name:	Methods for chemical analysis of iron, steel and alloy The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
Professional Classification:	H11 Steel and iron alloy analysis method
Professional Classification:	GB National Standard
ICS Classification:	77.080
Issued by:
Issued on:	1991-09-06
Implemented on:	1992-06-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:
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1 Subject Content and Application Scope

This standard specifies the determination of chromium content with sodium carbonate separation-diphenyl carbazide photometric method.
This standard is applicable to the determination of chromium content in carbon steel, low alloy steel and precious alloy. Determination range: 0.005%~0.500%.

2 Method Summary

Oxidize potassium permanganate in sulphuric acid solution to hexavalence; hexavalent chromium and diphenyl carbazide generate claret complex compound, and measure the absorbance. Deposit and separate the coexisting element such as iron with sodium carbonate in advance.
When coexisting 400mg iron, 60mg nickel, 40mg cobalt, 1mg copper, 2mg molybdenum and aluminium and 12mg tungsten, there is no effect on the determination of chromium after separation.