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(054) Fate and Behaviour of Marine Antifoulants in the Aquatic Environment. Comber, Sean1, Gardner, Mike1, Watts, Chris1, Franklin, Guy1, Boxall, Alistair1, Howcroft, Jane2, 1 2 ABSTRACT- The partitioning behaviour of the organic biocides, irgarol and diuron and two inorganic biocides (copper and zinc) was investigated using six sediments of differing physico-chemical properties collected from unimpacted sites along the south coast of England. Both the kinetics of sorption and equilibrium partitioning characteristics between the sediments and seawater were investigated over a period of 20 d. Resulting organic carbon:water partition coefficients (log Koc) were related to suspended sediment concentration and ranged from 2.28 to 5.20 for diuron; and 2.41 to 4.89 for irgarol. Partition coefficients (Kp) for copper and zinc varied from 2.46 to 5.08 l/Kg and from 2.49 to 4.97 respectively. Kinetic data indicated that there was significant interactions between the dissolved and particulate phases at the start of the experiments, just after mixing, thought to be a result of redistribution of organic carbon between the two phases. The partitioning behaviour observed in the laboratory was reflected in field data collected for water and sediment within 2 U.K. estuaries. Key words: antifoulants, partitioning, irgarol, diuron |
