1. A. J. Parker Co-operative Research Centre for Hydrometallurgy, CSIRO Division of Minerals, PO Box 90, Bentley, WA 6982, Australia (H.R.W., P.M.S.); Department of Chemistry, Murdoch University, Murdoch, WA 6150, Australia (P.M.S., G.T.H., P.M.M.); and Department of Chemistry, University of Western Australia, Nedlands, WA 6009, Australia (L.B.)