Toxicity Assessments of Antimony, Barium, Beryllium, and Manganese for Development of Ecological Soil Screening Levels (ECO-SSL) Using Earthworm (Eisenia Fetida) Benchmark Values
Final rept. Feb 2000-Sep 2002
EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
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The U.S. Environmental Protection Agency USEPA, in a collaborative effort with other Federal agencies, states, and private industry, is developing Ecological Soil Screening Levels Eco-SSLs for ecological risk assessment of contaminants at Superfund sites. Earthworm Eisenia fetida cocoon production and survival tests were conducted in a Sassafras sandy loam soil that supports relatively high bioavailability of barium Ba, beryllium Be, manganese Mn, and antimony Sb. For the metals tested, cocoon production was a more sensitive endpoint than was survival. Bounded Lowest Observed Effect Concentrations LOECs mg kg-1 for cocoon production, as determined by analysis of variance ANOVA, were 83, 86, 433, and 1236 for Be, Sb, Ba, and Mn, as compared to LOECs for survival of 110, 697, 1585, and 2222, respectively. Bounded No Observed Effect Concentrations NOECs mg kg-1 for cocoon production, as determined by ANOVA, were 57, 60,258, and 1111 for Be, Sb, Ba, and Mn, as compared to NOECs for survival of 83, 617,1348, and 1444, respectively. Non-linear regression analysis of cocoon production data showed that the relative toxicity EC20 mg kg-1 of the four metals was in the order of Sb 30 Be 52 Ba 370 Mn 629. These results will be submitted to the Eco-SSL Work ou for review and inclusion in their database.
- Anatomy and Physiology
- Inorganic Chemistry
- Organic Chemistry