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==Introduction==

==Introduction==

Environmental contaminants cover U.S. grounds.  These contaminants include polychlorinated biphenyls (PCBs), chlorinated organic solvents, and organochlorine pesticides<ref name="Zhang"/>.  The EPA reported that more than 1500 sites are polluted and in the last decade, less than a third of them have been cleaned up<ref>[http://www.epa.gov/superfund/sites/npl/index.htm EPA (US Environmental Protection Agency), 2003a.  Superfund National Priorities List (NPL).]  </ref>.  The current clean up procedure for these contaminants are costly and limited.  Much environmental research has been dedicated to less costly alternatives<ref name="Mikszewski"/>.  One alternative that has proven to be successful in laboratory research as well as field test studies is the use of nanoscale iron particles.

Environmental contaminants cover U.S. grounds.  These contaminants include polychlorinated biphenyls (PCBs), chlorinated organic solvents, and organochlorine pesticides<ref name="Zhang"/>.  The EPA reported that more than 1500 sites are polluted and in the last decade, less than a third of them have been cleaned up<ref>[http://www.epa.gov/superfund/sites/npl/index.htm EPA (US Environmental Protection Agency), 2003a.  Superfund National Priorities List (NPL).]  </ref>.  The current clean up procedure for these contaminants are costly and limited.  Much environmental research has been dedicated to less costly alternatives<ref name="Mikszewski"/>.  One alternative that has proven to be successful in laboratory research as well as field test studies is the use of nanoscale iron particles.