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

Lipophile: A substance that tends to dissolve in organic, non-polar
solvents. Lipophilic substances generally have very low water
solubility.
LO(A)EL (Lowest observed (adverse) effect level): The lowest dose
in a bioassay that results in observed effects in the exposed
organisms. In some cases, observed effects may be of
questionable impact or possibly beneficial. Therefore, obvious
negative effects may be differentiated as "adverse".
LOEC (Lowest Observed Effect Concentration): The lowest
concentration of a chemical used in a toxicity test that has a
statistically significant adverse effect on test organisms relative
to a control.
Log K ow (Log n-Octanol/Water Partition Coefficient): The logarithm
(base 10) of the ratio of a substance's solubility in n-octanol and
in water at equilibrium; also expressed as log P. Log K ow
indicates a substance's tendency to bioaccumulate in terrestrial
and aquatic biota.
Long-term exposure: Exposure to a contaminant in a medium lasting
from several weeks to years and often includes a reproductive
or life cycle of the test organism. Usually referred to as a
chronic exposure. Absolute definitions for this term vary among
studies (see Part A, 3.1).
MMM
Macronutrient: A chemical necessary in large amounts, usually greater
than 1 ppm, for plant growth.
Mineralization: The decomposition of an element from an organic to an
inorganic state.
Mineral soil: A soil consisting predominantly of mineral matter (organic
carbon < 17%), except for an organic surface layer that may be
up to 40 cm thick.
Multimedia exposure assessment: The quantitative estimate of total
exposure to a chemical arising from all sources (air, water, soil,
food, consumer products), by all routes (ingestion, inhalation,
dermal absorption).
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