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Investigation of heavy metal contamination in marine sediment and water of proposed deep seaport area in Sonadia Island, Moheshkhali, Cox’s Bazar.

Abstract: This study conducted to measure the concentration of 14 heavy metals of surface marine water and surface marine sediments at six locations in the Sonadia Proposed deep sea port area by the energy dispersive X-ray fluorescence spectrometry(ED-XRF) technique. Al, K, Ca, Cr, Ni, Cu, As, Sr, Hg, Pb, Mg, Ti, Fe and Rb were quantified in the surface sediments. Most of the elements in marine water were found not to exceed the background concentration. The Igeo value of the metal indicated that the marine sediment was particularly uncontaminated by As, Ti, Rb, Fe, K, Ca. The Enrichment Factor (EFm) of the metal suggests the possible anthropogenic contamination and natural sediment of the coast, respectively. Igeo ranged of all metal except Al about 0.07 to 0.53 for all the MS Samples suggesting unpolluted and moderately polluted. Higher Igeo values were observed for Al probably due to the anthropogenic metal supply with uncontrolled discharge of industrial effluents into the upstream river which fall in the coast.

The present investigation showed that the Enrichment Factors of K, Ca, As, Ti, Fe and Rb was less than 1, showing no enrichment of K, Ca, As, Ti, Fe and Rb. Al was enriched in all sampling sites with 3746.24 to 3871.23 of EFm value. All the EFm values for Fe were greater than 1.25 which indicated that the sources of metals in the area were likely to be anthropogenic sources. Due to its (Fe) crustal dominance and its high immobility. Heavy metal concentrations were compared with the US EPA limitations and the other localities and seawater found to be comparatively below level than the other places around the world. According to recommendations of US EPA under the priority toxic metals like Cr, Cu, Ni and Pb concentration unpolluted in the study area seawater. So, the degree of heavy metal contamination falls in the unpolluted to moderately polluted class. The analyzed data revealed that in the marine water(MW) trace metal concentrations were decreased in sequence of K>Ca>Al>Cr>Hg>Sr>Cu>Ni=As=Pb and in Marine Sediment(MS) the sequence was Fe>Al>Ca>Mg>K>Sr>Rb>As.

Apparent anthropogenic impact on heavy metal levels do exist in the Sonadia Proposed deep sea port area though the degree of contamination is still unpolluted to moderately polluted. Apparent anthropogenic impact on metal levels does exist in the Sonadia Proposed deep sea port area though the degree of contamination is still moderate.

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