Mobility of arsenic and trace element inventories in sediment cores from Masuda City,southwestern Japan |
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| Authors: | M Hawa Bibi Faruque Ahmed Hiroaki Ishiga |
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| Institution: | (1) Department of Geoscience, Shimane University, Matsue 690-8504, Japan |
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| Abstract: | The vertical distribution of arsenic and other trace and major elements has been studied in four sediment cores from Masuda
City, Nagashima and Okite in the Shimane Prefecture of southwestern Japan. The sediment cores were also subjected to leaching
techniques and 14C dating. The stratigraphic sequences in the cores consist of silt and sandy silt at top, passing downward into gray to black
clays. Elevated values of As, Pb, Zn, Cu, Ni, Cr, and V are present in several horizons while abundances of these elements
tend to be higher in the black and gray clays, probably due to adsorption onto clay sediments. Higher concentrations of Fe
and total sulfur (TS) occur in black clays. The correlations of the trace metals with iron suggest their adsorption onto Fe
(oxy)hydroxides, whereas correlations with sulfur in some cores indicate that they were precipitated as Fe-sulfides. Age determinations
suggest that clay horizons at ∼5 m depth were deposited at around 5,000 and 6,000 years BP (14C ages) during the transgressive phase of sea level change. The results of the leaching techniques in the core samples show
that higher amounts of As were extracted with deionized water. Even at neutral pH, As can be released from sediments to groundwater,
and therefore groundwater pollution is a concern in Masuda City and the surrounding area. |
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| Keywords: | Arsenic Trace and major elements Leaching technique Groundwater contamination Southwestern Japan |
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