Abstract:

ater samples of 100 liters were absorbed with XAD2 and XAD4 resin columns,eluted with organic solvents and concentrated to 0.3 mL. The extracts were detected by GC/MS and GC,and 93 compounds were identified.They are nalkane,lipid isopentadiene alkane,polycyclic aromatic,aromatic, carboxylic acid, alcohol, aldehyde, ketone, esters, phthalic esters, organochlorine pesticides and polychlorinated biphenyls. The concentration of organic substances varied in the range of 0.027 and 4.79 μg/L.The nalkanes were distributed in a series of carbon numbers from C10 and C26,Maximum peak of carbon was C11 and C22 in the lakes respectively with a strong evenodd predommauc.The ratio of pristane to phytane may be used to judge the oxidation or reduction in aquatic environment.The monocarboxylic acid is distributed in C12∶0,C14∶0,C16∶0 and the dominant carboxylic acid was the straight chained C12∶0(Decanoic acid).The distribution indicated that the sources of organic substances are mainly derived from organism.Content of Benzoic acid methylester is the highest in the organic substances and the concentrations are 4.79 and 3.28 μg/L in two waters respectively.Three kinds of phthalic esters,dibutyl phthalate,diisobutyl phthalate and diisooctyl phthalate were found and the concentrations are in the range of 0.071 and 0.597 μg/L.Organochlorine pesticides (666,DDT) and Polychlorinated biphenyls(PCBs) in water samples of Mochou Lake and Heart Lake were also analyzed. The results show that the concentrations are in range of 0.012 and 0.356 μg/L 666,DDT and PCBs were detected. Even though the concentrations are low,it means that some global pollutants have more or less exerted their influence on the Antarctic environment.