1. Department of Chemistry, Curtin Water Quality Research Centre, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
2. Water Corporation, 629 Newcastle Street, Leederville, Perth, Western Australia 6007, Australia
3. Department of Health, Government of Western Australia. Grace Vaughan House 227 Stubbs Terrace, Shenton Park, Western Australia 6008, Australia