Acute Toxicity of Tributyltins and Tributyltin Leachates from Marine Antibiofouling Paints.
Summary rept. 1 Feb 81-31 Jan 82,
CALIFORNIA UNIV OAKLAND NAVAL BIOSCIENCES LAB
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Tributyltin compounds were shown to be slow-acting toxins causing acute toxicity to two amphipod species. Orchestia traskiana was exposed to bis tributyltin oxide TBTO or tributyltin fluoride TBIF as single compounds. Both compounds were acutely toxic in 10 days. Gammarus oceanicus were exposed to tributyltin leachates from panels painted with two different antifouling paint formulations. One type of paint leached tributyltin about 10 times faster than the other. Amphipod mortality in short-term tests was directly correlated with increases in painted surface area and leaching rates. The results of these experiments show that tributyltin compounds are very toxic to some non-target organisms. Thus the intelligent choice of antibiofouling paint formulations depends upon an acceptable compromise between leach rates, which are effective at the painted surface but minimize effects on non-target organisms. Keywords Coatings.