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Photo-production rates and overall scavenging rate constants of the highly reactive hydroxyl radicals (•OH) were measured by irradiation of surface seawater samples collected from the Seto Inland Sea, Japan. Photo-production rates ofOH ranged from 7.2 × 10 -12 M s -1 to 424 × 10 12 M s -1 and scavenging rate constants were 1.3 - 4.1×10 6 s -1 . The steady state concentrations ofOH in seawater, which were calculated from the photo-production rates and scavenging rate constants were in the range 2.6 -189 × 10 -18 M. Estimation from the scavenging rate constant showed that the lifetime ofOH in seawater ranged from 0.29 ×10 -6 s to 0.55 ×10 -6 s. Nitrates and hydrogen peroxide contributions to OH radical formation rates were negligible in the samples studied. However, direct photolysis of NO2 - accounted for up to 73% of the observed •OH formation rates. The rate constant for the reactionOH with irgarol was found to be (9.7 ± 0.52) × 10 9 M - 1 s -1. Based on the steady state concentration ofOH, the calculated half-lives for Irgarol due to the reaction with hydroxyl radicals in the Seto Inland Sea were in the range 4.3-318 days.

Determination of Hydroxyl Radical in Seto Inland Sea and its Potential to Degrade Irgarol