title: Effects of incubation time and organism density on the bioaccumulation of soil-borne p,p'-DDE by the earthworm, Eisenia fetida.
abstract: Laboratory-scale experiments were conducted to assess the influence of incubation time and organism density on bioaccumulation of weathered p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE) from soil by the earthworm Eisenia fetida. Bioaccumulation was measured after 14, 28, 42, and 56 days of exposure. Tissue concentration increased with incubation time and steady state was not reached until at least 42 days. Organism density had no effect on the bioaccumulation of weathered p,p'-DDE. Ratios of 10, 20, 40, and 80 earthworms/350 g of soil led to the same tissue concentrations in test organisms. Risk assessments of contaminated soil should account for these experimental variables.
authors.affiliation: Program in Environmental Science and Department of Chemistry, Muhlenberg College, Allentown, PA 18104, USA. kelsey@muhlenberg.edu
authors.forename: Jason W
authors.initials: JW
authors.lastname: Kelsey
authors.forename: Richard
authors.initials: R
authors.lastname: Peters
authors.forename: Ilya B
authors.initials: IB
authors.lastname: Slizovskiy
mesh_terms: D000818:Animals; D003633:Dichlorodiphenyl Dichloroethylene / Q000378:metabolism*; D004784:Environmental Monitoring; D009835:Oligochaeta / Q000378:metabolism*; D011156:Population Density; D012987:Soil; D012989:Soil Pollutants / Q000378:metabolism*; D013045:Species Specificity; D013997:Time Factors
chemical_list: D012987:Soil; D012989:Soil Pollutants; D003633:Dichlorodiphenyl Dichloroethylene