Abstract
The seasonal variations of the photolysis rates of 2-chlorophenol in some Japanese natural waters were investigated using solar-simulated radiation. The direct photolysis rate constants and the indirect photolysis rate constants were separately obtained. In a eutrophic lake water, indirect photolysis occurred during spring, summer and fall. The average contribution of indirect photolysis to the overall photolysis was ∼17%. In an oligotrophic lake water, indirect photolysis apparently occurred only in summer and direct photolysis was depressed in other seasons. The correlation between the first-order rate constant for indirect photolysis and COD by the permanganate method was poor in both lake waters. The contribution of singlet oxygen route decomposition to the indirect photolysis in eutrophic water was ∼10% in summer. In seawater, indirect photolysis occurred during spring, summer and fall. The average contribution of indirect photolysis to the overall photolysis was ∼15%.
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