Natural organic matter substance photoreaction

Halocarbons Sorbed on Natural Organic Matter, Photoreactions of aromatic halocarbons that strongly absorb solar radiation can be greatly accelerated in natural water samples or in aqueous solutions of NOM or humic substances (Table II). Although these effects can be due in part to indirect photoreactions or formation of photoreactive complexes, the results in Table II can be most simply explained in terms of increases in direct photoreaction rates of sorbed halocarbon in comparison to halocarbon in aqueous solution. 

Natural substances, especially natural organic matter, have important effects on halocarbon photoreactions in the environment. These effects include the initiation of indirect photoreductions of dissolved or sorbed halocarbons via the intermediacy of solvated electrons or excited states. Evidence is presented here that sorption enhances the quantum efficiencies of these indirect photoreactions, although more studies are required to better define these processes. 

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