2018YS/T 540.5-2018 Methods for chemical analysis of vanadium Part 5: Determination of impurity elements by inductively coupled plasma atomic emission spectrometry
2006YS/T 540.5-2006 Vanadium chemical analysis method isoamyl alcohol extraction spectrophotometric determination of iron content
YS/T 540.5-2006 Vanadium chemical analysis method isoamyl alcohol extraction spectrophotometric determination of iron content has been changed from GB/T 8639.5-1988 Vanadium--Determination of iron content--Isoamyl alcohol extraction spectrophotometric method.