1. Division of Chemistry, School of Science, Sheffield Hallam University, Sheffield, S1 1WB, U.K. (D.R.A., C.W.M.); British Steel Technical, Swinden Laboratories, Moorgate, Rotherham, S60 3AR, U.K. (T.E.); and Arun Technology Limited, Unit 16, Southwater Industrial Estate, Station Road, Southwater, Horsham, West Sussex, RH13 7UD, U.K. (A.T.S.)