A solvent aztraotion method based on the preferential extraction of Bc(lll) by 1-phsnyl-,V-methyJ.-4-benzoyl-pyrazolona-5 (HPHBP) has oeen devised for the separation and purification of Sic from otner trivalent aotinides and Ianthanidee. A single ayole purification of Bk(lH) from most of the impurities is obtained by this method An alternate method of purification of BK has been given using extraction chromatography with HEMBP impregnated oelite columns herein decontamination factors of ∼10 are obtained from other trivalent aotinidesi ianthanidee and inactive impurities ilka Fe,Cr,Al,Ni For Ce(III) a decontamination faotor of ∼60 is obtained