1. Department of Chemistry, Materials and Forensic Science, University of Technology, Sydney, P.O. Box 123, Broadway NSW 2007, Australia, Deans Unit, College of Science, Technology and Environment, University of Western Sydney, Locked Bag 1797, Penrith South DC, NSW 1797, Australia, and Technology Delivery Group, Alcoa World Alumina, Kwinana Alumina Refinery, P.O Box 161 Kwinana, Western Australia 6167, Australia