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Study of PAHs' and PCBs' occurrence and fate in marine aerosols of Eastern Mediterranean

We studied the atmospheric process of PAHs and PCBs occurring in the Eastern Mediterranean (Island of CreteGreece). The total atmospheric concentration of 35 PAHs, was 4.1-57.2 ng m (90% in gas phase). Air-sea exchange was estimated to introduce 865 tonnes y of PAHs in the whole eastern Mediterranean basin, while the corresponding wet and dry deposition fluxes were 235 and 75 tonnes y, respectively. The average concentrations of 74 PCB congeners in the gas and particulate phases of the atmosphere were 70 pg m and 2.3 pg m, respectively. Calculations have shown that 1,000 kg y and 200 kg y were eliminated from the atmosphere through wet and dry deposition respectively. Airsea exchange eliminated 700 kg y, and PCB losses via hydroxyl radical atmospheric reaction eliminated ca. 4,000 kg y. Sediment traps deployed in the same area have shown that sedimentation rates of total PAHs at depths of 250m and 1440m were 10.3 and 8.3 μg m y respectively. The corresponding results of fluxes for total PCBs ranged from 1.1 0.9 ng m d (depth: 250-2820 m).