1. Agency for Toxic Substances and Disease Registry (ATSDR), 2000. Toxicological profile for arsenic and cadmium. United States Department of Health and Human Services. http://www.atsdr.cdc.gov (Accessed October 2004).
2. The fate of trace elements in emissions control systems;Carras,1995
3. Canadian Environmental Protection Act (CEPA), 1995. Environment Canada, 1995, Catalogue No. EN21-137/1995E. (Accessed October 2004).
4. Analysis and Air Quality Division Environmental Technology Center;Canadian National Air Pollution Surveillance (NAPS) Network,2004