14:30 〜 14:45
[AHW18-14] The current state of heavy metals at the sediment-water interface of three coastal zones from the Bay of Bengal, the northeastern part of the Indian Ocean
キーワード：Heavy metals , Sediments , Coastal water, Bay of Bengal , ICP-MS
A precise analysis method is developed for the detection of heavy metals in the sediment and overlying water in the Bay of Bengal Coast areas can be interconnected and can have a new important implication for water quality. The concentrations of Cu, Zn, Cd, As, Pb, Fe, Mn, Ti, Al, Si, Cr, Zr, Ni, and organic content were measured in sediment and overlying seawater sampled by two different techniques: total quantification of heavy metals in the solid state of sediment by XRF, and improved dissolution technique for sediment and preconcentration of seawater followed by commercial analytical laboratories using standardized analytical methods for ICP-MS. This research is undertaken to assess the heavy metals movements in sediment and nearshore water of Potenga, Cox’s Bazar, Saint Martin Island with the help of a Geochemical model, GIS (Geographic Information System), and ODV (Ocean Data View) color mapping, by using precise geochemical data. Many early studies either did not determine trace metals in seawater for matrix effect or suffered from low metal recoveries for proper solid digestion process. The total findings represent that a significant component of bioactive, or nutrient, metals (Mn, Fe, Co, Ni, Cu, Zn, Cd) occur in the sediment-water phase along with numerous other trace metals like Cr, Zr, Ti, U etc. In contrast to these metals, dissolved Zn was predominantly soluble and high. However, the qualitative picture that emerged from this work has been refined with recent improved methods.