This standard applies to the determination of the amount of iron in vanadium metal. Measuring range: 0.030% to 0.30%.
GB/T 8639.4-1988 history
1988GB/T 8639.4-1988 Vanadium--Determination of iron content--Phenanthroline spectrophotometric method
GB/T 8639.4-1988 Vanadium--Determination of iron content--Phenanthroline spectrophotometric method was changed to YS/T 540.4-2006 Vanadium chemical analysis method o-phenanthroline spectrophotometric determination of iron content.