PW08 Aquatic Ecotoxicology II
Exhibit Hall
8:00 AM - Wednesday
(PW113) Fate and effects of Irgarol 1051 in marine microcosms.
Giddings, J1, Hoberg, J2, Sousa, J2, Biever, R2, Balcomb, R3, 1 Parametrix, Inc., Rochester, MA, USA2 Springborn Smithers Laboratories, Inc., Wareham, MA, USA3 Ciba Specialty Chemicals, Inc., Tarrytown, NY, USA
ABSTRACT- Outdoor marine microcosms containing natural sediment, natural seawater, and complex benthic and planktonic communities were exposed for 10 weeks to Irgarol 1051, an active ingredient in antifouling paints for recreational and commercial boats. Seawater and Irgarol 1051 were renewed three times each week to simulate flushing in a marina and to maintain Irgarol concentrations at the intended levels (100, 200, 400, and 800 ng/L). Exposures up to 400 ng/L resulted in no significant changes in the taxonomic structure of the phytoplankton, periphyton, or zooplankton communities, and no reductions in abundance of dominant species or marsh grass biomass. Reductions in phytoplankton at 800 ng/L were transient, and there were no effects on periphyton, zooplankton, or macroinvertebrates. The results are compared with those of previously published microcosm studies with Irgarol 1051 and with Irgarol concentrations reported from the field.
Key words: Irgarol, microcosm, antifoulant