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Presentation Title: Investigation of Sources of Metal Contamination on the Turtle Mountain Chippewa Reservation Discipline: Environmental Science School: Fort Berthold Community College Presentation Type: Poster Presentation Abstract: Investigation of Sources of Metal Contamination on the Turtle Mountain Chippewa Reservation Elizabeth Bluestone, Audrey LaVallie faculty of Turtle Mountain Community College Fort Berthold Community College

Funded by an NSF undergraduate research grant (REU), college students investigated metal contamination sources on the Turtle Mountain Chippewa Reservation. The sources of possible contamination included two separate media- open soil and wetland sediment. Wetland sediments were tested primarily for lead contamination when Dr. Debra Hunter, a leech research project investigator at TMCC, found that extensive leeching with leech traps weighted with lead weights had been ongoing for years in numerous sloughs on the reservation. Samples were crushed mildly if needed, and baked at 110 C for 30 minutes for thorough drying. Samples were digested first by acid and peroxide treatment in the hood and then further digested in an Ethos Milestone microwave by ramping to 180 C over 5.5 minutes and maintained at this temperature for another 4.4 minutes. Samples were diluted to a specified volume by %5 HNO3 with a small percentage of lanthanum suppressants present. Standards curves for Pb, Ni, Cr, Ag, Cd and Fe were calculated for a Buck 200A atomic absorption spectrometer, and field samples were then evaluated for these metals. Results showed that Pb, Ag, and Cd were not high (above limit of detection) in any open soil samples, according to EPA soil screening generic levels for ingestion. Slough sediment lead levels were determined to be under the EPA generic soil screening limit of 400 ppm in all samples, although lead was elevated in some sloughs compared to others, suggesting some additions to various bodies of water by some source, possibly leeching.

Presenter: Elizabeth Bluestone Tribe: Three Affiliated Tribes Primary Email: elizabeth.bluestone@fortbertholdcc.edu Biography I am currently a twenty year old full time senior at Fort Berthold Community College located in New Town, North Dakota. In Fall of 2009 I received my Associates Degree in Liberal Arts and Science, and spring of 2010 I received my Associates degree in Environmental Science. Summer of 2010 I interned in Belcourt, North Dakota at Turtle Mountain Community College and worked on Investigation of Sources of Metal Contimination of the Turtle Mountain Chippewa Reservation. May 2012 I will be graduating with a bachelor degree in Environmental Science at Fort Berthold Community College.

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2011 National Conference Student Research Abstracts  
2011 National Conference Student Research Abstracts  

A comprehensive list of the student research topics that will be presented at the AISES 2011 National Conference

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