Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/17107
Share/Impact:
Título : Persistent organochlorine compounds in soils and sediments of European high altitude mountain lakes
Autor : Grimalt, Joan O., Van Drooge, Barend L., Ribes, Alejandra, Vilanova, Rosa M., Fernández Ramón, M. Pilar, Appleby, Peter
Palabras clave : Organochlorine compounds
High mountains
Soils
Lacustrine sediments
Trace chemical pollution in remote environments
Fecha de publicación : Mar-2004
Editor: Elsevier
Resumen: The composition of persistent organochlorine compounds (OC) in soils and sediments from two high altitude European mountain lakes, Redon in the Pyrenees and Ladove in the Tatra mountains, has been studied. Sediment cores from two additional lakes in the Tatra mountains, Starolesnianske Pleso and Dlugi Staw, have also been examined. DDTs (1.7–13 ng g−1) were the most abundant OC in soils followed by total polychlorobiphenyls (PCBs; 0.41–1.5 ng g−1) and hexachlorobenzene (HCB; 0.15–0.91 ng g−1). In sediments, the dominant OC were also DDTs (3.3–28 ng g−1) and PCBs (2.3–15 ng g−1). These concentrations are low, involving absence of major pollution sources in these high mountain regions.
The downcore OC profiles in soils and sediments were similar but higher concentrations and steeper vertical gradients were observed in the latter. Radiometric determinations showed absence of significant OC transport from catchment to lake. The sediment–soil difference points therefore to a better retention of the OC load in sediments than soils which may be related to the low temperatures that are currently encountered at the bottom of the lake water column and the depletion of sediment bioturbation in these cold environments.
Significant qualitative changes in the soil PCB distributions are observed downcore. These involve a dominance of the high molecular weight congeners in the top core sections and those of lower weight (i.e. less chlorinated) in the bottom. Anaerobic dechlorination of higher molecular weight congeners occurring in microsites, e.g. as observed in flooded or poorly drained soils, could be responsible for these changes. This process could be concurrent to bioturbation.
Descripción : 13 pages, 6 figures, 2 tables.-- PMID: 14659957 [PubMed].-- Available online Nov 21, 2003.
Versión del editor: http://dx.doi.org/10.1016/j.chemosphere.2003.09.047
URI : http://hdl.handle.net/10261/17107
ISSN: 0045-6535 (Print)
1879-1298 (Online)
DOI: 10.1016/j.chemosphere.2003.09.047
Citación : Chemosphere 54(10): 1549-1561 (2004)
Appears in Collections:(IDAEA) Artículos

Files in This Item:
There are no files associated with this item.
Show full item record
 
CSIC SFX LinksSFX Query


Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.