Spatial distribution and corresponding determining factors of metal concentrations in surface sediments of Beppu Bay, southwest Japan |
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| Authors: | Amano Atsuko Kuwae Michinobu Agusa Tetsuro Omori Koji Takeoka Hidetaka Tanabe Shinsuke Sugimoto Takashige |
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| Affiliation: | a Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba 305-8567, Japan;b Senior Research Fellow Center, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan;c Department of Legal Medicine, Faculty of Medicine, Shimane University, Enya 89-1, Izumo, Shimane 693-8501, Japan;d Center for Marine Environmental Studies, Ehime University, Bunkyo-cho 2-5, Matsuyama 790-8577, Japan;e Institute of Oceanic Research and Development, Tokai University, Shizuoka 424-8610, Japan |
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| Abstract: | This study determined the factors contributing to the spatial distribution of 14 metal concentrations in the surface sediments of Beppu Bay on the basis of comparisons of the organic geochemical properties and environmental parameters through principal component analysis (PCA) and redundancy analysis (RDA). The results of PCA and RDA showed that the concentrations of V, Cr, Co, and As were closely related to the distances between the sampling sites and the Oita River. This indicated that these metals originated from the river's drainage area. The Mn, Cu, Mo, and Cd concentrations were related to the water depth. These results indicated that the Mo, Cd, and Cu deposition processes were controlled by oxygen depletion, and that these elements accumulated in the deeper parts of the bay under anoxic conditions. |
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| Keywords: | Surface sediment Metal Organic geochemical property Redox condition PCA RDA |
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