... Environmental Science, Murdoch University, WA 6150, Australia Hofstede H T and Ho, G E (1991) The effect of the addition of bauxite refining residue (red mud) on the behaviour of heavy metals ... Ecosystems and Environment, 27, 493-503 Qiao, L., Hofstede, H and Ho, G E (1993) The mobility of heavy metals in clay amended sewage sludge and municipal solid waste compost In: Proceeding of 9th ... 1993) In order to determine the long-term fate and potential hazard of land application of MSW compost, it is necessary to investigate the speciation of heavy metals Difficulties in studying this...