STP659

    Toxicity Testing in the United Kingdom for the Evaluation of Oil Slick Dispersants

    Published: Jan 1978


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    Abstract

    Until recently, the toxicity of dispersants approved for use in U.K. waters was evaluated by a static bioassay on the dispersant alone.

    Following the 1974 Dumping at Sea Act, dispersant evaluation methods were reviewed and dispersants are now licensed for sea (offshore) or for beach use, based on two tests to assess the environmental effect of the dispersant use.

    The “sea” test assesses the toxicity to Crangon crangon of a chemically dispersed oil and compares it with the toxicity of the oil alone. Mortality is measured over a period of 100 min at an oil concentration of 1000 ppm.

    The “beach” test assesses the toxicity of the dispersant alone to a typical intertidal organism, Patella vulgata, by spraying with dispersant and rinsing in a simulated tidal cycle. Mortalities are measured after 72 h and compared with those of an oil control.

    The rationale behind the development of these tests is described, together with the experimental results. The U.K. criteria for licensing products on the basis of these test results are also discussed.

    Keywords:

    toxicity testing, dispersants, oils, licensing, sea and beach use


    Author Information:

    Norton, MG
    Directorate of Fisheries Research of the Ministry of Agriculture, Fisheries and Food, Fisheries Laboratory, Essex

    Franklin, FL
    Directorate of Fisheries Research of the Ministry of Agriculture, Fisheries and Food, Fisheries Laboratory, Essex

    Blackman, RAA
    Directorate of Fisheries Research of the Ministry of Agriculture, Fisheries and Food, Fisheries Laboratory, Essex


    Paper ID: STP35707S

    Committee/Subcommittee: F20.11

    DOI: 10.1520/STP35707S


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