The nobelium can then be isolated by exploiting its tendency to form the divalent state, unlike the other trivalent actinides : under typically used elution conditions ( bis-( 2-ethylhexyl ) phosphoric acid ( HDEHP ) as stationary organic phase and 0.05 M hydrochloric acid as mobile aqueous phase, or using 3 M hydrochloric acid as an eluant from cation-exchange resin columns ), nobelium will pass through the column and elute while the other trivalent actinides remain on the column.
