: oxidation under the influence of radiant energy (such as light)

What is photo-oxidation of water?

The photolysis is an oxidative process and means splitting of water in the presence of light to form oxygen, protons and electrons. As a result, there is the evolution of oxygen and the electron move through Mn-protein bound to PS- II.

What causes photooxidation under natural condition?

It occurs when the sun's action on an oil slick causes oxygen and carbons to combine and form new products that may be resins. The resins may be somewhat soluble and dissolve into the water, or they may cause water-in-oil emulsions to form.