1999GB/T 3257.23-1999 Methods for chemical analysis of bauxite--Determination of organic carbon content--Titrimetric method
GB/T 3257.23-1999 Methods for chemical analysis of bauxite--Determination of organic carbon content--Titrimetric method was changed to YS/T 575.21-2006 Bauxite Ore Chemical Analysis Method Titration Determination of Organic Carbon Content.