Petroleum films exposed to sunlight produce hydroxyl radical

- Sunlight exposed oil films produced substantial amounts of hydroxyl radical.
- ∼4 × 10−7 moles OH were produced in 24 h from sunlight irradiated 100 mg oil films.
- [OH] = 1.2-2.4 × 10−16 M in water under 100 mg irradiated oil films.
- TiO2 nanoparticles changed the formation rate of hydroxyl radical.