1. American Public Health Association (APHA) American Water Works Association Water Pollution Control Federation (1989). Standard methods for the examination of water and wastewater APHA Washington D.C.
2. American Society of Testing and Materials (ASTM). (1970). “Special procedure for testing soil and rocks for engineering purposes.” D422-54 West Conshohocken Pa. 101–103.
3. Becher P. (1965). Emulsions theory and practice 2nd Ed. Reinhold New York.
4. Cameron R. E. (1992). “Guide to site and soil description for hazardous waste site characterization. Volume 1: Metals.” EPA/600/4-91/029 Environmental Protection Agency Washington D.C.
5. Partitioning of trace metals before and after biological removal of metals from sediments