Ecological risk assessment of new substances under the Canadian Environmental Protection Act (CEPA): Exposure assessment
Conference
·
OSTI ID:230921
- Environment Canada, Hull, Quebec (Canada)
As part of a pollution prevention management approach to toxic substances, the Substances New to Canada provisions in CEPA ensure no new substance is introduced into the Canadian marketplace before an assessment of its ``toxicity`` has been completed. Consequently, the purpose of the New Substance assessment process is to determine whether or not substances are, or are suspected of being, ``toxic`` as defined in Section 11 of CEPA. The determination of ``toxic`` consists of integrating the assessment of potential exposure of a substance to humans and components of the environment with potential adverse effects on humans or the environment. This paper describes Canada`s approach to the environmental exposure assessment within the context of the new substances program. The potential for exposure to a substance depends on the amount of substance released into the environment and its environmental fate. The exposure assessment, therefore, consists of predicting the environmental concentrations (PEC) of a substance from releases resulting from its production, processing, uses, and disposal, and its environmental fate evaluated on the basis of intrinsic physical/chemical properties, environmental mobility, compartmentalization, and persistence. The assessment considers the use of the substance identified by the notifier, as well as other possible ways the substance might be used. The subsequent ecological risk assessment is conducted using a quotient method comparing the concern concentration with predicted environmental concentrations.
- OSTI ID:
- 230921
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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