Ecotoxicity model, risk-based

The model risk-based ecotoxicity order includes provisions that are found in most of the model orders ... 

Risk-Based Ecotoxicity model 5(e) order (Sept. 2004) 5 e Order Ecotoxicity... 

Environment Canada recently developed an evaluation system based on effluent toxicity testing, capable of ranking the environmental hazards of industrial effluents [185]. This so-called Potential Ecotoxic Effects Probe (PEEP) incorporates the results of a variety of small-scale toxicity tests into one relative toxicity index to prioritize effluents for sanitation. In the index no allowance has been made for in-stream dilution, therefore the acmal risk for environmental effects is not modeled. The tests performed on each effluent are the following bacterial assay [V.fisheri (P. phosphoreum), Microtox], microalgal assay S. capricornutum) crustacean assay (C. dubiay, and bacterial genotoxicity test E. coli, SOS-test). 

The information necessary for the assessment of environmental hazard and risk, resulting from the use of chemicals, is preferably obtained from field monitoring and laboratory studies, but often it has to be supplemented by estimates based on various modelling techniques. The input data set required for risk assessments comprises data on the persistence, accumulation, mobility and ecotoxicity of chemicals as well as detailed information on the particular environment, to estimate in stepwise fashion the exposure concentration and the toxic levels for a regional scenario (Figure 9.1). 

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