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1.why.study.fate.10 - Hydrolysis – degradation via...

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Why Study Fate? Introduction Transport/Partitioning Processes Transformations Chemical Fate Overview Why? Chemical Risk!
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Definitions Environmental fate – study of the sources, processes, reactions, and targets of chemicals in the environment. Source – point of origin of a chemical. Target – the organism(s) impacted by a chemical.
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Environmental Partitioning Processes Dissolution – dissociation in water to discrete molecules. Adsorption – adherence to particle surfaces (soils). Volatilization – evaporation as a gas.
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Environmental Transformations Oxidation-reduction – degradation via loss-gain of e-s.
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Unformatted text preview: Hydrolysis – degradation via nucleophilic reaction with water. Photolysis – degradation via sunlight energy (photons). Pyrolysis – degradation via heat-fire (includes pyrogenesis). Biodegradation – degradation via metabolism. Chemicals Run a “Gauntlet” of Processes Chemical Risk! Chemical risk – The inherent probability that a chemical exposure will result in an adverse effect. Risk is not only based on the potency of a chemical, but also on the exposure to it. Risk = exposure / LD50 Exposure to an agent is greatly influenced by environmental processes!...
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