BIOGEOCHEMICAL APPROACHES TO ECOSYSTEM ENDPOINTS

Under both national and international agreements, the process of quantitatively predicting the probability of an adverse response in ecosystem health due to exposure to one or more pollutants is collectively known as Environmental Risk Assessment, ERA (US EPA, 1992). 

In accordance with this definition, an environmental risk assessment process is used especially in cases when the probability component arises during the calculation of various parameters which can be due to many reasons uncertainty of input information uncertainties in applying an algorithm due to lack of knowledge, insufficient knowledge and/or simplification of input information uncertainties in the defined geographic boundaries of pollutant influence uncertainties in both computer calculations and management operations based on these calculations. 

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