Trace metal pollution assessment in the surface sediments of nearshore area, off Calicut, southwest coast of India
| Autor: | M.K. Sreeraj, K.K. Ramachandran, R. Shynu, Reji Srinivas |
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| Rok vydání: | 2017 |
| Předmět: |
Total organic carbon
Pollution Geologic Sediments 010504 meteorology & atmospheric sciences media_common.quotation_subject Winnowing Environmental engineering Sediment India 010501 environmental sciences Aquatic Science Oceanography 01 natural sciences Grain size Environmental chemistry Metals Heavy Trace metal Enrichment factor Geology Water Pollutants Chemical 0105 earth and related environmental sciences media_common Environmental Monitoring |
| Zdroj: | Marine pollution bulletin. 120(1-2) |
| ISSN: | 1879-3363 |
| Popis: | Metal concentrations (Al, Cr, Ni, Cu, Zn, and Pb), grain size, and total organic carbon content in 29 surface sediment samples from the nearshore area off Calicut were analyzed to determine their distribution and pollution status. Surface sediments were dominantly silts with low percentage of clay and sand at nearshore and offshore areas. The mean metal concentrations were in the following order: Cr>Ni>Zn>Pb>Cu. The enrichment factor and geo-accumulation index of metals suggest that the surface sediments were not polluted by Zn and moderately polluted by Cu and Ni. By contrast, Cr and Pb showed significant enrichment levels. Results from a multivariate statistical analysis suggested that the spatial enrichment of these heavy metals was related to sediment type. Thus, the sediment distribution and their metal enrichment were mainly controlled by local hydrodynamic conditions that caused the winnowing of fine-grained sediments. |
| Databáze: | OpenAIRE |
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