Protocol for the Derivation of Environmental and Human ... - CCME

and medicines). Estimated daily intake of a chemical is
determined through a multimedia exposure assessment.
Evapotranspiration: The loss of water from a given area during a
specified period by evaporation from the soil surface and by
transpiration from plants.
Exposure: Contact between a substance and an individual or
population. Exposure may occur via different routes including
ingestion, dermal absorption, and inhalation.
Exposure characterization: Identification of the conditions of contact
between a substance and an individual or population. Exposure
characteristics may involve identifying concentration, routes of
uptake, target sources, environmental pathways, and the
population at risk.
Exposure estimation: Estimate of the amount and duration of contact
between a substance and an individual or a population.
Exposure estimates consider factors like concentration, routes
of uptake, target sources, environmental pathways, population
at risk, and time scale.
Exposure pathway: The route by which an organism comes into
contact with a contaminant. In the ecological effects-based
procedure, exposure pathways are restricted to organisms in
contact with contaminated soil. In the human health-based
procedure, exposure pathways include contact through
consumption of contaminated food, direct soil ingestion, dust
inhalation, and dermal absorption.
Exposure route: The mode of entry of a chemical into the body. The
three basic exposure routes are ingestion, inhalation, and dermal
absorption.
Exposure scenario: A clearly and quantitatively defined description of
all circumstances associated with a receptor that would permit
the estimation of chemical exposure. These circumstances
include amount of air breathed, food and water consumed, soil
ingested, and the critical receptor's weight, age, sex, and all
other relevant considerations.
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