This review examines the rate constants for hydrolysis in water of 12 classes of organic compounds with the objective of using these data to estimate the presistence of these compounds in freshwater aquatic syslems. Pri• mary data were obtained by literature review through mdst of 1975 and some of 1976. These data, which include values for acid, base, and water promoted rate constants (kA, kB' kN) and temperature coefficients are presented in 18 tables in section 4. Estimated rate constants for hydrolysis under environmental conditions are presented .in 13 tables in section 5, including rate constants at 298 K and pH 7 for acid, base, and water promoted reactions together with values for the estimated rate constant (k h) and the half-life (t l / 2).

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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.