2009YS/T 226.12-2009 Methods for chemical analysis of selenium.Part 12:Determination of selenium content.Sodium thiosulphate titrimetric method
1970YS/T 226.15-1994 Determination of selenium content in selenium (sodium thiosulfate volumetric method)
YS/T 226.15-1994 Determination of selenium content in selenium (sodium thiosulfate volumetric method) was changed to YS/T 226.12-2009 Methods for chemical analysis of selenium.Part 12:Determination of selenium content.Sodium thiosulphate titrimetric method.