ENSC 201 Lecture Notes - Lecture 12: Ecotoxicology, Chain Transfer, Particulates

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ENSC 201 Week 6 Lecture 2
Lecture 12: Air Pollution
Working Definition of Atmospheric Pollution
Substances that are released into the atmosphere, deliberately or
inadvertently, from natural or anthropogenic sources and that have the
potential to be toxic or cause harm
Historical Background for Ecotoxicology & Atmospheric Pollution
Four part process
oRelease into the environment
oTransport into biota, with or without chemical transformation
oExposure of one or more target organisms
oResponse of individual organism, population or community
Goals for Regulation and Risk Management
In order to control, regulate or remove sources of atmospheric pollution, a
clear scientific understanding of the physical, chemical and biological
processes involved is essential, with assessment and management of risk
Release of Atmospheric Pollutants into the Environment
Point sources: stationary or mobile
Diffuse (non-point sources)
Transformation (secondary pollutants)
Transport into biota of atmospheric pollutants and exposure of target organisms to
atmospheric pollutants
Components of the model for which atmospheric pollution is most distinctive
Routes of Exposure for Atmospheric Pollutants
Direct exposure from the air
Atmosphere as a medium for chemical or physical transformation
Atmosphere as a vector for local deposition into water or onto soil
Atmosphere as a vector for long range transport
Exposure of Target Organisms to Atmospheric Pollutants
Direct – inhalation, entry through pores, stomates, or contact with skin
From water
From soil
Food chain transfer
Response to Atmospheric Pollutants
All biological responses to inorganic or organic contaminants previously
discussed apply
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