STP737

    A Risk Assessment of Toxicants to Aquatic Life Using Environmental Exposure Estimates and Laboratory Toxicity Data

    Published: Jan 1981


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    Abstract

    Laboratory toxicity data can be combined with computer migration and fate models to assess the risks of contaminants to aquatic life from point and nonpoint discharge sources. Environmental exposure to selected species is estimated from overland and in-stream transport modeling. A statistical code uses LC50 and maximum acceptable toxicant concentrations (MATC) data to predict the frequency and duration of dissolved contaminant concentrations that exceed median lethal and sublethal concentrations to the species of concern. Two pesticides, alachlor (an actual case) and toxaphene (a hypothetical case), are analyzed to demonstrate the hazard assessment process. The overall methodology provides a means of comparing relatively the toxic effects of different chemicals and also provides a framework for future fate and risk assessment studies.

    Keywords:

    hazard assessment, aquatic toxicity, toxicology, fate, models, risk, methodology, alachlor, aquatic toxicology


    Author Information:

    Parkhurst, MA
    Research scientist, staff scientist, and senior research scientist, Battelle Pacific Northwest Laboratories, Richland, Wash.

    Onishi, Y
    Research scientist, staff scientist, and senior research scientist, Battelle Pacific Northwest Laboratories, Richland, Wash.

    Olsen, AR
    Research scientist, staff scientist, and senior research scientist, Battelle Pacific Northwest Laboratories, Richland, Wash.


    Paper ID: STP34149S

    Committee/Subcommittee: D19.02

    DOI: 10.1520/STP34149S


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