Overview: Mathematical models are being increasingly used to estimate theconcentrations of a wide range of substances in the environment for avariety of reasons, including government control and legislation, andrisk and hazard estimation. Exposure assessment has to be performedfor many types of substances, including pesticides, industrialchemicals, pollutants, accidental discharges, etc. The interpretationof the results of model equations should always bear in mind thepurpose for which the model used was built in the first place.Further, models are always an abstraction of reality, requiringsi
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