GB/T 223.45-1994
Methods for chemical analysis of iron, steel and alloy—The cupral separation-xylidyl blue Ⅱphotometric method for the determination of magnesium content
GB/T 1832-1979
Determination of magnesium oxide content in tin concentrates--Xylidyl blue Ⅱ photometric method
GB/T 6900.7-1986
Fireclay and high-alumina refractories—Determination of magnesium oxide content—Xylidyl blue Ⅰ-CTAB photometric method