Reducing uncertainty in ecological risk assessment: The pros of measuring contaminant exposures

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:212087

Burris, J A ^[1]; Pease, A ^[2]

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1. ABB Environmental Services, Knoxville, TN (United States)
2. ABB Environmental Services, Arlington, VA (United States)

Wildlife species (mammals, birds and reptiles) are primarily exposed to contamination in soils via ingestion of food. Uncertainties in risk analyses for this pathway are largely associated with the estimation of the amount of contamination in food items. The benefits of measuring contaminant concentrations in food items are examined based on comparison of risk results with and without measurements of exposure. At two hazardous waste sites, plants and earthworms were analyzed for metals and organics. Site-specific bioaccumulation factors (BAFs) were calculated and compared to literature reported values. In general, the metals concentrations in plant samples were higher than those predicted by literature values with the exception of cadmium and copper. Metal concentrations measured in invertebrates (worms) were lower than those predicted by literature values with the exception of arsenic. Literature BAFs did not adequately predict concentrations of barium, mercury or copper in invertebrate tissue. In the ecological risk assessments for both of the sites, if site-specific measurements were used, risks for wildlife species were not predicted. However if literature BAF values were used, unacceptable risks were predicted. The higher estimates of risks were associated with overestimates of dietary exposures of lead, cadmium, chromium, copper and zinc. Measurement of contaminant exposures provided for a more realistic and cost-effective estimate of ecological risks. The effect of using the empirical data on the magnitude of risks were evaluated including decisions concerning remediation. A cost-benefit analysis will be provided comparing the costs of measurement of exposures versus remediation.

• OSTI ID: 212087
• Report Number(s): CONF-9511137--; ISBN 1-880611-03-1
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
ANNELIDS
ARSENIC
BARIUM
BIOLOGICAL ACCUMULATION
BIOLOGICAL INDICATORS
CADMIUM
CHROMIUM
COPPER
DATA COVARIANCES
ENVIRONMENTAL EXPOSURE PATHWAY
FOOD CHAINS
LEAD
MERCURY
PLANTS
POLLUTION
REMEDIAL ACTION
RISK ASSESSMENT
SENSITIVITY
WILD ANIMALS
ZINC