DiscussionW. H. Duewer (Lawrence Livermore Laboratory). The stationary state assumption for various free radicals has been tested by other modelers and found to be satisfactory for several. The large discrepancies found by the authors suggest errors either in the formulation of the model or of the steady state expression. Because only a few terms were included in the steady state approximations used, I suspect the latter. If there is no error (e.g., omitted significant terms) then the significant differences between your model and other models that cause your model not to behave 2483 as a steady state species should be described. In the case of

Photooxidation of cumene (isopropylbenzene) and pyridine in dilute solution in natural waters gives products characteristic of reactions with alkylperoxy (RO(2).) and hydroxyl (HO.) radicals. On the basis of the rates of formation of the products, the average concentrations of RO(2). and HO. are estimated to be about 10(-9) and 10(-17) mole per liter, respectively. The concentration of RO(2). is large enough that, for some classes of reactive chemicals, oxidation can be an important process in natural waters.

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