Complexes of ibuprofen and copper andor zinc were solubilized in ammoniacal solution providing preservative solutions that fully penetrate wood. The column is disposed upstream of an extractive wash column. The outer member is configured for movement relative to the first and second elements along a first axis perpendicular to the common axis, and the inner member is mounted within the outer member for rotation relative to the outer member about a second axis perpendicular to the first axis and the common axis and for movement relative to the outer member along the second axis.