Glossary

AEGL-2: Acute Exposure Guideline Levels - 2. The airborne concentration of a substance above which it is predicted that the general population, including susceptible individuals, could experience irreversible or other serious, long-lasting adverse health effects or an impaired ability to escape.
BAF: Bioaccumulation Factor. In aquatic organisms this is the ratio of the concentration of a substance in an organism, and the concentrations in the water and diet that the organism is exposed to.
BCF: Bioconcentration Factor. In aquatic organisms this is the ratio of the concentration of a substance in an organism, and the concentrations in the water and diet that the organism is exposed to.
Boiling point: Boiling point is the temperature at which the vapour pressure of a liquid exceeds atmospheric pressure. Since atmospheric pressure can no longer keep the substance in the liquid state, bubbles begin to form and the material converts into a vapour. Boiling point provides us a relative index of a liquid's volatility
CRAIM: Conseil pour la reduction des accidents industriels majeurs: the Montréal section of the now defunct Major Industrial Accidents Council of Canada (MIACC).
DSL: Domestic Substances List
E2 Plans: Environmental Emergency (E2) Plans address the prevention of, preparedness for, responses to and recovery from environmental emergencies in order to repair, reduce or mitigate the negative effects of an incident.
EC50: Effective Concentration 50. The concentration of a substance that has a specified non-lethal effect on half of the test organisms within a specified period of time. Effects measured are often number of young produced, time to reproduction, etc.
EER: Environmental Emergency Regulations under Section 200 of CEPA 1999 (proposed). Schedule I of the proposed regulation lists 174 chemicals that would require E2 Plans.
ERPG-2: Emergency Response Planning Guideline - 2. The maximum concentration in air below which it is believed nearly all individuals could be exposed for up to one hour without experiencing or developing irreversible or other serious health effects or symptoms that could impair their abilities to take protective action.
emergencies pathway: Ways that a chemical could enter the environment so as to meet the definition of environmental emergency.
Environmental Emergency: Section 193 of CEPA "Environmental Matters Related to Emergencies" definition: a) an uncontrolled, unplanned or accidental release, or release in contravention of regulations made under this Part, of a substance into the environment; or b) the reasonable likelihood of such a release into the environment.
Flash point: Flash point is defined as the lowest temperature at which a flammable liquid gives off sufficient vapour to form an ignitable mixture with air near its surface or within a vessel.
Half-life: The time needed to reduce the quantity of a chemical by transformation to half its initial quantity in the environment. Denoted by T½.
Hazard Score: Hazard Scores are calculated by the REF to determine overall hazards for human, environmental and physical parameters.
IARC: International Agency for Research on Cancer
IC50: Inhibitory Concentration 50. The concentration of a substance estimated to inhibit the biological endpoint of interest (e.g. cell growth) by 50%.
Kow: The octanol-water partition coefficient Kow, usually presented as a logarithm (log Kow), is considered a surrogate for BCF in the simplest model of bioaccumulation. The log Kow is a measure of how polar the substance is by determining whether the substance partitions primarily to water or to octanol. Substances that partition primarily to octanol are likely to bioaccumulate in the fat of organisms.
LC50: Lethal Concentration 50. The estimated concentration of a substance required to cause death in 50% of the test organisms in a specified time period.
LD50: Median Lethal Dose. A statistically derived single dose of a substance that can be expected to cause death in 50% of the animals. This value is expressed in terms of the weight of the test substance per unit weight of the test animal (e.g. mg/kg bw).
NFPA: U.S. National Fire Protection Association
NPRI: National Pollutant Release Inventory
PBT: Persistence, Bioaccumulation and Toxicity
REF: The Risk Evaluation Framework is a scoring system done in Microsoft Excel that incorporates the CRAIM criteria for human health and safety with environmental criteria.
S199: Section 199 of CEPA 1999 requires an assessment of all substances on the Toxic Substances List for E2 Plans.
S200: Section 200 of CEPA 1999 allows the Minister of the Environment to require E2 Plans for chemicals that meet the CEPA toxicity definition as a result of an environmental emergency.
STEL: Short Term Exposure Level. The concentration to which workers can be exposed continuously for a short period of time (usually 10 or 15 minutes) without suffering from: irritation; chronic or irreversible tissue damage; or narcosis of sufficient degree to increase the likelihood of accidental injury, impair self-rescue or materially reduce work efficiency.
TSMP: Toxic Substances Management Policy
trigger values: Values in the REF that by themselves trigger the requirement for an E2 Plan.

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2022-09-16

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Glossary

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This historical page is being kept for research or referencepurposes and will not be updated.

This historical page is being kept for research or referencepurposes and will not be updated.

Glossary

Page details

This historical page is being kept for research or reference
purposes and will not be updated.

This historical page is being kept for research or reference
purposes and will not be updated.