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GB/T 223.48-1985
Methods for chemical analysis of iron，steel and alloy--The semixylenol orange photometric method for the determination of bismuth content
GB/T 223.42-1985
Methods for chemical analysis of iron，steel and alloy--The anion-exchange separation-bromopyrogallol red photometric method for the determination of tantalumcontent
GB/T 223.41-1985
Methods for chemical analysis of iron，steel and alloy--The anion-exchange separation-pyrogallol photometric method for the determination of tantalum content
GB/T 223.38-1985
Methods for chemical analysis of iron，steel and alloy--The anion-exchange separation-gravimetric method for the determination of niobium content