Concentrations of dissolved organic carbon in coastal location in Hiroshima bay [Japan]
1995
Matsuyama, Y. (Nansei National Fisheries Research Inst., Ono, Hiroshima (Japan)) | Uchida, T. | Honjo, T.
Concentrations of dissolved organic carbon (DOC) from surface samples in Hiroshima Bay, Seto Inland Sea, were determined by the high temperature oxidation method. The method gave reproducible results with a mean concentration (+-S.D.) of 1.44+-0.04 mgC/l (n=6) on October 14, 1992. DOC concentrations of the samples collected from Hiroshima Bay ranged from 1.44 to 2.50 mgC/l. The highest concentration was detected in the sample from Heterosigma akashiwo bloom. This suggests that the high DOC value was caused by the excretion of metabolites of this species. Further, the DOC content of a sample was fractionated by microfiltration (pore size 0.1 micrometer) and ultrafiltration (MW 3000). The fraction of less than MW 3000, MW 3000 - 0.1 micrometer, and 0.1 - 1 micrometer was estimated to contain 57%, 23% and 20% of total amount of DOC, respectively. The DOC concentrations of samples in Hiroshima Bay were similar or slightly higher than those determined previously in the other water
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