Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:6:p2
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 6 (pt 2/5)
Character Range: 1470059–1473125

environmental compartment or organisms to half the initial concentration, by transport processes, (for example, diffusive elimination), transformation processes (for example, biodegradation or metabolism) or growth.
Biomagnification factor is the quantitative measure of a chemical's tendency to be taken up through the food web.
Biomagnification is the accumulation and transfer of chemicals via the food web due to ingestion, resulting in an increase of the internal concentration in organisms at the succeeding trophic levels.
Chronic is the extended or long-term exposure to a stressor, conventionally taken to include at least a tenth of the life-span of a species.
Concentrationresponse curve is a curve describing the relationship between response in the test population and exposure concentration.
Contaminant is any chemical existing in the environment above background levels and representing, or potentially representing, an adverse health or environmental risk.
Contamination means the condition of land or water where any chemical substance or waste has been added at above background level and represents, or potentially represents, an adverse health or environmental impact.
Control is treatment in a trial that duplicates all the conditions of the exposure treatments but contains no test material.
Default conversion factors are numerical values that are used to convert a measure of toxicity to another measure of toxicity (for example, EC50 to a NOEC) when no experimentally determined values are available.
Ecological investigation level (EIL) is the concentration of a contaminant above which further appropriate investigation and evaluation of the impact on ecological values will be required. The EILs are calculated using EC30 or lowest observed effect concentrations (LOEC) toxicity data. EILs are the sum of the added contaminant limit (ACL) and the ambient background concentration (ABC) and the limit is expressed in terms of total concentration. All EILs, whether generic, soil-specific or site-specific, only apply to soil to a depth of two metres below the current soil surface.
ECx means effective concentration; the concentration which affects X% of a test population after a specified exposure time.
End point assessment is a quantitative or quantifiable expression of the environmental value considered to be at risk in a risk analysis.
Environmental fate means the destiny of a chemical or biological pollutant after its release into the natural environment.
Environmental quality guideline is a generic term that applies to any guidelines that control the concentration of contaminants in various environmental compartments (for example, water, sediment, soil).
Freundlich adsorption isotherm is an empirical equation that describes the adsorption of a contaminant to soil. The equation for this is x/m = KfCel/n, where x/m is the concentration of the contaminant in soil (mg/kg), Ce is the contaminant concentration in the aqueous phase at equilibrium (mg/L), Kf is the equilibrium constant (the Freundlich adsorption constant)