Changes in Biodegradation and Toxicity Because of Pollutant Sequestration in Soil.
Final rept. 1 May 95-31 Jul 98,
CORNELL UNIV ITHACA NY
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Organic compounds were shown to become sequestered in soil with a consequent decrease in biodegradability, availability for animal uptake, and toxicity. The rate and extent of sequestration varied among soils with dissimilar properties. Sequestration could be increased or decreased by appropriate soil treatments. Sequestration and bio-remediation caused a marked diminution in availability of organic compounds to animals. Because of sequestration, current methods for analysis give inappropriate estimates of exposure and risk from persistent pollutants. Analytical methods to assess changes in bioavailability resulting from sequestration were developed. Among the compoundsevaluated were several polycyclic aromatic hydrocarbons, triazines, and chlorinated hydrocarbons. Data were obtained in support of hypotheses suggesting that nanopores or partitioning into organic matter is responsible for sequestration.
- Geology, Geochemistry and Mineralogy