Distribution,Sources and Risk Assessment of Polychlorinated Biphenyls in Soils from the Midway Atoll,North Pacific Ocean |
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| Authors: | Jing Ge Lee Ann Woodward Qing X Li Jun Wang |
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| Institution: | 1. Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China.; 2. U.S. Fish and Wildlife Service, Pacific Reefs NWRC, Honolulu, Hawaii, United States of America.; 3. Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States of America.; National Cancer Institute at Frederick, United States of America, |
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| Abstract: | Concentrations of 28 polychlorinated biphenyls (PCBs) were assessed in soils from the Midway Atoll in the central North Pacific Ocean. The analytical procedure involved the application of accelerated solvent extraction (ASE) and gas chromatography coupled with ion trap mass spectrometric detection (GC/ITMS) for identification and quantification. Among the 28 PCB congeners studied, 26 of them, except CB195 and CB209, were detected in the analyzed samples at different frequencies. The total concentrations of 28 indicator PCBs (ΣPCBs) ranged from 2.6 to 148.8 ng g−1 with an average value of 50.7 ng g−1 and median of 39.5 ng g−1. Sources and congeners’ pattern of PCB were investigated in the soil of Midway Atoll. The principal component analysis indicated that the compositions of PCBs in most of the soil samples were similar. The total concentrations of PCBs were used to assess the cancer risk probabilities in humans via ingestion, dermal contact and inhalation of soil particles. Very low cancer risk was found in all soil samples caused by ΣPCBs. |
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