Spatial and temporal assessment of metal pollution in the sediments of the Qaraoun reservoir, Lebanon
| Autor: | Mahmoud Wazne, Samira Ibrahim Korfali |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Pollution
Geologic Sediments 010504 meteorology & atmospheric sciences Health Toxicology and Mutagenesis media_common.quotation_subject chemistry.chemical_element Environmental pollution 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Metals Heavy Environmental Chemistry Lebanon Water pollution 0105 earth and related environmental sciences media_common Total organic carbon Cadmium Sediment General Medicine chemistry Environmental chemistry Carbonate Environmental science Water quality Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Environmental Science and Pollution Research. 23:7603-7614 |
| ISSN: | 1614-7499 0944-1344 |
| Popis: | This study reports on metal (Cd, Cr, Cu, Ni, Pb, and Zn) pollution in the sediments of the Qaraoun reservoir over a span period of 9 years (2004, 2008, and 2013) along with key major environmental indicators. This time period corresponds with the onset of the rapid economic and industrial development of the reservoir region. For the first time, this study assessed the degree of environmental pollution by using indices such as enrichment factors (EF), contamination factors (CF), pollution load index (PLI), and geoaccumulation index (I geo). Moreover, sequential extraction was used to study the operationally determined chemical forms of the metals and their spatial and temporal distribution in the sediments. Correlation coefficients were also calculated to delineate the origin and association of the metals. Total metal concentrations and the environmental indices indicated increased pollution with time. Total organic carbon data showed a remarkable and significant increase in the organic fraction in 2013 relative to previous years. The increase in the organic fraction in the sediments was accompanied with a shift in cadmium [Cd] and lead [Pb] fractionation from the carbonate fraction to the organic fraction. The enrichment of the metal in the sediments along with the increased organic content is expected to exacerbate the metal bioavailability in the reservoir. |
| Databáze: | OpenAIRE |
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