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Fate of an Antifoulant in an Aquatic Environment

1993; American Chemical Society; Linguagem: Inglês

10.1021/bk-1993-0522.ch012

1947-5918

Andrew Jacobson, Leonardo Mazza, L. J. Lawrence, Barbara Lawrence, Scott D. Jackson, A. Kesterson,

Chemistry and Chemical Engineering

RH-5287 (2-n-octyl-4,5-dichloro-1-isothiazolin-3-one) had a half-life of less than 1 hour in both an aerobic and an anaerobic aquatic microcosm consisting of marine sediment and seawater. Upon application of 0.05 ppm 14C RH-5287, over 90% of the 14C-activity partitioned rapidly into the sediment. Soxhlet extractions with dichloromethane:methanol (9:1) followed by methanol eluted approximately 30 - 60% of the total applied radioactivity. After exhaustive extraction of the post-Soxhlet extracted sediment with 0.25N HCl followed by 1N NaOH, 14 to 40% of the total applied radioactivity still remained bound to the marine sediment. In the aerobic microcosm, 14CO2 accounted for approximately 24% of the applied activity after 30 days. The production of sizable quantities of 14CO2 and extractable polar metabolites indicated that degradation involves cleavage of the isothiazolone ring.