Trace organic contaminants and their sources in surface sediments of Santa Monica Bay,California, USA |
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| Institution: | 1. Laboratory of Environmental Bioprocesses, Centre of Biotechnology of Sfax, BP 1177, 3018 Sfax, Tunisia;2. Laboratory of Plant Molecular Physiology, Centre of Biotechnology of Borj-Cédria, 2050 Hammam-Lif, Tunisia;3. Laboratory of Hetero-Organic Compounds and Nanostructured Materials (LR18ES11), Department of Chemistry, Faculty of Sciences of Bizerte, University of Carthage, 7021 Zarzouna, Tunisia;4. Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, 13288, Marseille, France;5. Laboratory of Marine Environment, National Institute of Marine Science and Technology (INSTM), Goulette, Tunisia;6. Biotechnology Program, Center for Sustainable Development, College of Arts and Sciences, Qatar University, Doha 2713, Qatar;1. Ingeniería Ambiental, Depto. Ing. Civil, DI-CGT, Universidad de Guanajuato, Guanajuato, Gto, Mexico;2. Depto. Astronomía, DCNyE-CGT, Universidad de Guanajuato, Gto, Mexico;3. Equipe Environnement et Microbiologie (EEM-UMR-IPREM), Universitè de Pau et des Pays de l''Adour, Pau, France;4. Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil;5. Inst. Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil;1. School of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK;2. Centre of Ecology and Hydrology, Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB, UK;3. Lancaster Environment Centre, Lancaster University, LEC Building, Lancaster LA1 4YQ, UK |
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| Abstract: | Spatial distribution of selected contaminants in the surface sediments of Santa Monica Bay (SMB), California was investigated. Sediments were analyzed for DDTs (DDT and metabolites), polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), linear alkylbenzenes (LABs) and coprostanol. Effluent samples from the Hyperion Treatment Plant (HTP), which discharges treated municipal wastewater effluents into SMB, were also analyzed. The inter-correlation in the distribution trends of contaminants was examined. The concentrations of contaminants were interpolated in a geographic information system to visualize their spatial distribution in the Bay. Inventories of the contaminants were also estimated.The concentrations of coprostanol, LABs and PCBs are very high only in the vicinity of the sewage outfall whereas PAHs and DDTs occur widespread in the Bay. The poor correlation of DDTs with LABs, PAHs or coprostanol content confirms the historic origin of DDTs and their absence in the contemporary wastewaters. Moderate correlation of DDTs with PCBs implies historic deposits as a major origin of PCBs. There are hot spots of DDTs at water depths of 60 and 100 m and the inventory of DDTs in Bay sediments is insignificant compared to that estimated in the Palos Verdes Shelf which extends from the southern edge of Redondo Canyon around Palos Verdes Peninsula. The concentration of toxic contaminants was examined according to published sediment quality guidelines. About 20 stations contain p, p′-DDE and/or total DDTs above ERM and, PCBs between ERL and ERM indicating potential for adverse biological effects. |
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