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Toxic Substances Hydrology Program

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Photodegradation

Photodegradation is the chemical transformation of a compound into smaller compounds caused by the absorption of ultraviolet, visible, or infrared radiation (light). In many cases photodegradation is an oxidation process. Many compounds, when exposed to sunlight, degrade to smaller compounds. Some drinking-water and wastewater treatment facilities use ultraviolet light to destroy pollutants (through oxidation).

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