4.Sources.15 - Chemical Sources Why are they Important...

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Chemical Sources – Why are they Important? Introduction – Some Definitions What is Normal? Sources – Why are they Important? Chemical Sinks in the Environment Environmental Compartments Summary and Conclusions
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I. Introduction – Definitions Revisited Toxicant – a chemical that causes an adverse effect at a dose or concentration of interest Contaminant – a chemical present at an abnormal concentration Pollutant – a toxic contaminant Chemistry – study of chemical properties and reactions Environmental chemistry – study of chemical movement and reactions in the environment, as dictated by their properties
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II. What is Normal?? Normal is a defined concept – it can be more difficult to grasp than “abnormal” Normal can be defined according to place “spatial” Normal can be defined according to time in history – “temporal” Typical interest is to “clean up” the environment to what it once was – but where and when??
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Current Atmospheric Composition
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