PCBS AND CHLORINATED PESTICIDES IN THE ATMOSPHERE AND AQUATIC ORGANISMS OF ROSS ISLAND, ANTARCTICA

PCBs, p,p'-DDT, p,p'-DDE and lindane (gamma-hexachlorocyclohexane) were monitored in the lower atmosphere of Ross Island, in Antarctica for 2 yr. Geometrical means were 15.2 pg m-3 for PCBs, 2.0 pg m-3 for p,p'-DDT, 1.0 pg m-3 for p,p'-DDE and 25.8 pg m-3 for lindane. Atmospheric levels of lindane were positively correlated with temperature, and a significant difference was found between spring-summer and summer-winter concentrations. No season related differences were found for the other chlorinated hydrocarbons, possibly owing to their lower vapour pressure and the cold climate. Periods with increased atmospheric levels of PCBs and DDT compounds were recorded. Lindane, p,p'-DDE and PCBs were present in fish and zooplankton sampled close to Ross Island. Pollutant levels in the zooplankton (on an extractable fat basis) were highest during the Antarctic spring and autumn and were inversely correlated to their fat content.