Reversed-phase extraction chromatographic separation of zinc(II) with trioctylphosphine oxide

A new method for extraction chromatographic separation of zinc (II) was dev eloped with Trioctylphosphine oxide as the stationary phase and nitric acid as mobile phase on silica gel as stationary support. Zinc was extracted fr om 2.5 M hydrochloric acid and then stripped with 4 M nitric acid and deter mined spectrophotometrically at 460 nm by murexide method. Zinc was separat ed from alkali, alkaline earths, chromium, iron, cobalt, nickel, cadmium, m ercury, lead, trivalent rare earths, platinum group metals from binary mixt ures by selective extraction of zinc. Zinc is also separated from multicomp onent mixtures. The method was extended for the analysis of zinc in alloys and industrial sample.