User Guide to Thresholds and Classification - Environmental ...

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278User Guide for Thresholds and ClassificationsTermDefinitionThe lowest value expressed in milligrams of a substance per litre of water from:a. fish LC 50 data after a 96-hour exposure period; oracute aquatic ecotoxicity valueb. crustacean EC 50 data after a 48-hour exposure period; orc. algal, or other aquatic plant, EC 50 data after a 72-hour or 96-hour exposureperiod.See Schedule 6 to the Hazardous Substances (Classification) Regulations2001. See also LC 50, EC 50.BCFbioaccumulativeSee bioconcentration factor (BCF).Any substance that has a bioconcentration factor (BCF) greater than or equal to500 or, if BCF data are not available, a log K OW equal to or less than 4; and, forthe purposes of this definition, measured log K OW values take precedence overestimated values.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001. See also biconcentration factor (BCF), K OW.biocidal actionbioconcentration factor (BCF)BOD 5chemical oxygen demandchronic aquatic ecotoxicityvalueCODIn relation to a substance, means the substance causes mortality, inhibitedgrowth, or inhibited reproduction in an organism.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.The steady state concentration of a substance in an aquatic organism dividedby the concentration of the substance in the surrounding water.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.The five-day biochemical oxygen demand, being the mass of oxygen consumedby micro-organisms during oxidation of the substance in water over five days,expressed in milligrams of oxygen consumed per milligrams of the substance.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.See COD.The lowest value expressed in milligrams of a substance per litre of water fromchronic fish, crustacean, algal, or other aquatic plant NOEC data.See Schedule 6 to the Hazardous Substances (Classification) Regulations2001. See also NOEC.The chemical oxygen demand, being the equivalent mass of oxygen from anoxidising agent, of a strength at least equal to the oxidising strength ofpotassium permanganate or potassium dichromate, that is consumed duringoxidation of the substance in water, expressed in milligrams of oxygenconsumed per milligram of the substance.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.January 2012 EPA0109
279User Guide for Thresholds and ClassificationsTermdataDT 50DefinitionIncludes values that are directly measured, calculated, or estimated for any ofthe measures given.See Hazardous Substances (Minimum Degrees of Hazard) Regulations 2001.The time required to reduce the concentration of the original substance in anenvironmental medium by 50% as a result of biotic or abiotic processes.The median effect concentration, being a statistically derived concentration of asubstance that can be expected to cause:EC 50a. an adverse reaction in 50% of organisms; orb. a 50% reduction in growth or in the growth rate of organisms.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.ecotoxicologically relevantmetabolitefive-day biochemical oxygendemandA metabolite that poses a higher or comparable risk to terrestrial or aquaticorganisms as the parent substance. Such a metabolite is relevant for the overalldecision on classification of the parent substance.See BOD 5.K OWLC 50LD 50The steady state ratio of the solubility of a substance in n-octanol to thesolubility of that substance in water.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.The median lethal concentration, being a statistically derived concentration of asubstance that can be expected to cause death in 50% of organisms exposedfor a specified time.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.A median lethal dose, being a statistically derived single dose of a substancethat can be expected to cause death in 50% of organisms.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.Either LC 50 or EC 50 data.L(E)C 50LOEClowest observed effectconcentrationSee Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001. See also LC 50, EC 50.The lowest observed effect concentration, being the lowest concentration of asubstance that produces a significant ecotoxic effect in an organism or organismpopulation.See Schedule 6 to the Hazardous Substances (Minimum Degrees of Hazard)Regulations 2001.See LOEC.January 2012 EPA0109
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