An Measured Environmental Concentration (MEC) relates to a chemical substance found in an environmental sample. The concentration of the compound may result from direct contamination, transformation and/or metabolization of a different chemical contaminant, natural origin or a combination of these sources.
MEC is to be used as a reference in the context of
Chemical Safety Assessments (CSA) and should be compared with the respective
Predicted Environmental Concentration Calculated value of a chemical in the environment on the basis of exposure models such as the European Union System for the Evaluation of Substances (EUSES). Used in the context of Chemical Safety Assessments (CSA) and referenced in Chemical Safet ...
(PEC) and
Predicted No-Effect Concentration The predicted no-effect concentration (PNEC) is the concentration of a chemical which marks the limit at which below no adverse effects of exposure in an ecosystem are measured. PNEC values are intended to be conservative and predict the concentrati ...
(PNEC) in order to decide whether exposure model is valid and the compound related risk is controlled.
References
Chemical safety
Concentration indicators
Toxicology
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