PUMA
Istituto di Scienze Marine     
Giuliani S., Piazza R., Bellucci L. G., Huu Cu N., Vecchiato M., Romano S., Mugnai C., Nhon D. H., Frignani M. PCBs in Central Vietnam coastal lagoons: Levels and trends in dynamic environments. In: Marine Pollution Bulletin, vol. 62 pp. 1013 - 1024. Elsevier, 2011.
 
 
Abstract
(English)
PCBs were analysed in surficial sediments and selected sediment cores collected between 2002 and 2008 in Central Vietnam coastal lagoons. The aim was to determine contamination levels and trends, and to evaluate the effects of anthropogenic pressures and natural events. Samples were mostly fine-grained with low total PCB concentrations (0.367-44.7 lg kg 1 ). Atmospheric transport and post depositional processes modify to some degree the fingerprint of PCB inputs to the environment favouring the predominance of 3, 4 and 5 chlorinated congeners. The similarity of congener distributions in contemporary surficial samples also suggests the presence of a unique source over the entire study area, probably connected to mobilisation and long range transports from land-based stocks. The removal of consistent sediment layers is hypothesised based on repeated samplings of the same area. Natural teorological events (such as typhoons) are suspected to be responsible for these sediment losses.  2011 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.marpolbul.2011.02.035
Subject Polychlorinated biphenyls
Sediments
Historical trends
Coastal Lagoons
Central Vietnam


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