Twenty-nine shelf sediment samples have been collected from the Southwestern part of the Bay of Bengal in 5 transects lying offshore between the coasts of Cuddalore and Nagapattinam district, Tamil Nadu, India. Collected samples were analyzed for sediment texture, organic matter (OM), and trace metals (Fe, Cu, Co, Mn, Pb, Zn, Cr, and Ni). Sandy fractions were found to be abundant in all transects except transect 3, because of the existence of the Pichavaram estuary fed by river Vellar in the north and Coleroon in the south. Among all the trace metals, Fe is the most abundant in the sediment samples. And metals such as Co, Pb, Cr and Ni are higher than the average background values, suggesting adverse effects of human activities in polluting the marine environment. The pollution indices viz. Enrichment Factor (EF), Geoaccumulation Index (Igeo), and Contamination Factor (CF) were calculated to assess trace metal pollution. The results imply that Cu, Co, Mn, Pb, Zn, Cr, and Ni in most of the sampling sites are highly contaminated in terms of Geoaccumulation Index (Igeo). Pb, Zn and Cr are heavily contaminated, while Cu, Mn, Ni, and Co showed moderate contamination, as demonstrated by the CF values. Pearson correlation and principal component analysis (PCA), explain the combination of geogenic and anthropogenic sources contributing trace metals to the marine system.
The study of heavy metal distribution in the shelf sediments of Southwestern part of Bay of Bengal is essential in determining the distribution pattern and to understand the consequences of marine pollution beside the coastal environment. The south eastern coastal areas of India are affected by several disturbances and contamination associated with accelerated industrialization and urbanization. Twenty-nine surface sediment samples were collected from shelf region of Southwestern part of Bay of Bengal and analyzed for sediment texture, organic matter and heavy metals. Pollution indices such as Enrichment Factor (EF), Geoaccumulation Index (Igeo), Contamination Factor (CF) as well as multivariate statistical analyses were used to recognize the pollution pattern and probable sources for metal contamination. Comparatively, the concentration of heavy metals in the study area is closely associated with finer fractions and organic matter. The results demonstrate that Cu, Co, Mn, Pb, Zn, Cr and Ni in most of the sites are extremely contaminated in terms of Igeo. The computed values of CF indicate very high contamination of the metals like Pb, Zn and Cr followed by uncontamination to moderate contamination of Cu, Mn, Ni, Co. Based on factor analysis, domestic and industrial activities from adjacent land areas are found to be the major contributors of heavy metals in the shelf sediments.
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