Historical trends of polychlorinated dibenzo-p-dioxins and dibenzofurans in three dated sediment cores from Mexico
| Autor: | MacÍas Zamora J. Vinicio, Laval Liong Wee Kwong, Canedo López Yunuén, Huerta Diaz Miguel Angel, Joan-Albert Sanchez-Cabeza |
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| Rok vydání: | 2011 |
| Předmět: |
Hydrology
Geologic Sediments Persistent organic pollutant Polychlorinated Dibenzodioxins Health Toxicology and Mutagenesis Sediment General Medicine History 20th Century Sedimentation Toxicology History 21st Century Pollution Polychlorinated Dibenzo-p-dioxins Age estimation Environmental chemistry Reference values Environmental science Mexico Surface water Water Pollutants Chemical Volume concentration Benzofurans |
| Zdroj: | Environmental Pollution. 159:487-494 |
| ISSN: | 0269-7491 |
| DOI: | 10.1016/j.envpol.2010.10.024 |
| Popis: | This paper describes the first report of dioxins and furans (PCDDs/Fs) in sediment cores from Mexico. Sedimentation rates and vertical fluxes were estimated using (210)Pb dating. Two cores correspond to marine sediments and one to an endorheic lake. Concentrations of PCDDs/Fs found in the three sites are typical of non-impacted areas with low concentrations when compared to reference values. However the PCDDs/Fs sediment profiles show an increasing concentration trend in the upper core sections. This behavior is different from that found at many sites around the globe where diminishing concentrations have been reported. A strong predominance of OCDD was observed, and a comparison to typical composition profiles of industrial and other sources did not result in clear origin assignments for these measured compounds. We suggest that local sources may be responsible for the increase in concentration and, because these undetermined sources have not been curtailed, their importance is still growing. |
| Databáze: | OpenAIRE |
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