Neptunium(III) application in extraction chromatography

► We demonstrated the formation of Np(III) via Np(IV) reduction by Cr(II). ► The high purity separation of Np(IV) from U(IV) on TEVA resin was possible. ► Np(III) is strongly retained on DGA resin. ► Cr(III) impurities are removed using 9 M HCl on both resins.