China 'GB/T 223.51-1987
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 223.51-1987
Methods for chemical analysis of iron,steel and alloy--The 2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol photometric method for the determination of zinc content 钢铁及合金化学分析方法 5-Br-PADAP 光度法测定锌量
Issued Date:1987-05-12
Implemented Date:1988-03-01
Issued by:
The Standardization Administration of the People's Republic of China