大阪港周辺海域のプランクトン中重金属および人工有機化合物濃度

概要

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This study was made in order to evaluate the feasiblity of net plankton analysis for monitoring pollution due to heavy metals and synthetic chemicals in seawater. Plankton was collected by using a phytoplankton net in the harbor area of Osaka City, Japan. Heavy metals, organochlorine and organophosphorus compounds in the net plankton and also in the corresponding seawater were determined. The heavy metal concentration in the seawater increased in the order of, Hg<Cd<Pb<Cu, Cr<Ni<Zn<Mn<Fe. In the net plankton, the order was follwes; Hg<Cd<Ni, Cr, Pb<Cu, Mn<Zn<Fe. Except for Ni and Mn, the meatal levels in the net plankton corresponded to those in the seawater, and their bioconcentration factors (BCF) were 1 to 5×104, but in Ni and Mn the factors were 0.4to 0.5×104. Organochlorine compounds such as PCBs and HCH were clearly noticed in net plankton and the levels ranged form 1 to 5 μg/g and from 0.1 to 0.2 μg/g in dry basis, respectively. These values were entirely dependent on the seawater levels and the BCF of PCBs was 11×104 and 0.4×104 in HCH. Organophosphorus pesticides including diazinon, IBP and fenitorthion were almost always found in the seawater. There compounds, however, were never detected in the net plankton. These results indicate the feasibilty of plankton analysis for monitoring approximate pollution in water, but some problems observed in certain metals and organophosphorus compounds still remain to be studied.