Concentration level of dissolved cadmium and its variation in surface seawater of Urasoko Bay,Ishigaki Island |
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| Authors: | Kazuo Abe |
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| Institution: | (1) Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fukai-Ota, Ishigaki 907-0451, Japan |
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| Abstract: | From April 2005 to March 2006, the concentration of dissolved cadmium (Cd) was monitored in the surface seawater of Urasoko
Bay, which is in a subtropical area of the North Pacific Ocean and is surrounded by a well-developed fringing reef. During
this period, the observed salinity and Cd concentrations varied in a range of approximately 16–34.5 and 4.8–77.8 pM, respectively.
The concentration range of Cd obtained in this study was considered to be too low to damage the coral species, and its variation
throughout the year did not show any seasonality and was not connected with climate data. The Cd-salinity plot for all the
data in the salinity range over 26 showed apparent non-conservative behavior, which suggests a possible irregular input of
Cd from a solid phase through streams and groundwater, release from bottom sediments, and atmospheric deposition into the
bay. |
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| Keywords: | Cd concentration level Urasoko Bay Ishigaki Island |
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