Photodegradation is degradation of a photodegradable
molecule
caused by the absorption of photons, particularly those wavelengths
found in sunlight,
such as infrared radiation, visible
light, and ultraviolet light. However, other forms of electromagnetic radiation can cause
photodegradation. Photodegradation includes photodissociation,
the breakup of molecules into smaller pieces by photons. It also includes the
change of a molecule's shape to make it irreversibly altered, such as the denaturing of proteins, and
the addition of other atoms
or molecules. A common photodegradation reaction is oxidation.
This type of photodegradation is used by some drinking
water and wastewater facilities to destroy pollutants.
Photodegradation in the environment is part of the process by which ambergris
evolves from its fatty
precursor.
The United States federal standard for testing plastic for
photodegradation is 40 CFR Ch. I (7–1–03 Edition)PART 238
Photodegradation also destroys paintings and other artifact
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