High mercury contamination in a romanian reservoir: history and fate.
Mercury is ubiquitous and hazardous contaminant in the environment. In aquatic ecosystem, it can be found as inorganic mercury, Hg<2+>, elemental mercury, Hg<0>, or organic mercury. The main objective of the project is to carry out a state-of- the-art environmental assessment of the most contaminated section of the Olt River and its reservoirs (Valcea, Govora and Babeni) with a special attention to sediments. Industrial activity impact trough Olt River (Romania) was studied. Total Hg was analysed in cores and surface sediments. The highest concentrations of total Hg determined was 21μm/g in surface sediments, near industrial discharge (chlor-alkali plant). Historic evolution of Hg pollution in the region was assessed. Several strong peaks could be distinguished in older sediments (30.3 and 44.5μm/g at 88-89cm and 111-112cm depth, respectively). <137>Cs activity measurements dated these peaks at 1991 and 1987 respectively. The clay and sand fraction, total Hg concentration and <137>Cs indicate probably a flood event. The upper layer of the sediment is still contaminated by Hg (2.40μm/g Total Hg). Even though regulations have been adopted about Hg in Romania Olt River, affluent of Danube, is still polluted and this contamination may have a non negligible impact on the ecosystem.
mercury reservoir sediment historical record Olt River
A. Garcia Bravo C. Marcic L. Ancey J. L. Loizeau G. Ungureanu J. Dominik
Institute F.-A. Forel, University of Geneva,10 Route de Suisse, CH-1290 Versoix, Switzerland Faculty of Geology and Geophysics, University of Bucharest, Romania
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
462-463
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）