Review of the occurrence, persistence and degradation of tributyltin in fresh water ecosystems in Canada / R.J. Maguire. : En13-5/86-54E-PDF

"In Canada tributyltin has been found mainly in harbours, marinas and shipping channels, which is consistent with its use as an antifouling agent. In water its concentration in some locations is high enough to cause concern with regard to chronic toxicity or effects in sensitive organisms. It has also been found in mg/kg concentrations in harbor sediments, but the toxicological significance of sediment-associated tributyltin is unknown. Biological degradation in water and sediment appears to be the rate-limiting factor which determines the persistence of tributyltin in aquatic environments, and based upon laboratory experiments the half-life in fresh water at 20 degrees is estimated to be of the order of 6 weeks to a few months. Methylation of tributyltin and its degradation products in aquatic environments has been demonstrated, but it does not appear to be a significant pathway of transformation in fresh water"--Abstract.

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