China 'GB/T 223.12-1991
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 223.12-1991
Methodsfor chemical analysis of iron,steel and alloy--The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content 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
Issued Date:1991-09-06
Implemented Date:1992-06-01
Issued by:
The Standardization Administration of the People's Republic of China