An extraction-spectrophotometric method for the determination of trace
amounts of vanadium(V)) is described. The method is based on the extr
action of the complex formed between salicylaldehyde-1-phthalazino-hyd
razone monohydrochloride and vanadium(V) in methylisobytyl ketone from
acidic medium. The method has been applied to determine vanadium in a
tmospheric particulate matter.