GB 223.46-1985 Methods for chemical analysis of iron, steel and alloys - Determination of magnesium content by atomic absorption spectrophotometry (English Version)
1989GB/T 223.46-1989 Methods for chemical analysis of iron,steel and alloy--The flame atomic absorption spectrometric method for the determination of magnesium content
1985GB 223.46-1985 Methods for chemical analysis of iron, steel and alloys - Determination of magnesium content by atomic absorption spectrophotometry