China 'GB/T 1819.9-2017
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 1819.9-2017
Methods for chemical analysis of tin concentrates—Part 9:Determination of tungsten trioxide content—The thiocyanate spectrophotometric method 锡精矿化学分析方法 第9部分:三氧化钨量的测定 硫氰酸盐分光光度法
Issued Date:2017-09-29
Implemented Date:2018-04-01
Issued by:
The Standardization Administration of the People's Republic of China