洞海湾底質中の有機スズ化合物の分布と挙動
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概要
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The concentrations of tributyltin (Bu3Sn+), triphenyltin (Ph3Sn+) and their degradated products including dibutyltin (Bu2Sn2+), butyltin(BuSn3+), diphenyltin (Ph2Sn2+) and phenyltin (PhSn3+) in the inside and in the outside of Dokai Bay were measured to investigate their distributions and behavior by GC-FPD. No organotins were detected in the sediment samples taken from the outside of Dokai Bay. The highest concentrations of Bu3Sn+ and Ph3Sn+ were 0.42 and 0.29mg·kg-1·dry in the inside of Dokai Bay, respectively. Relatively high concentrations of Bu3Sn+ and Ph3Sn+ were found in the areas of heavy shipping traffic, shipyards and docks, where they are used as antifouling agents in paints for boats and ships. Coefficients of sediment-water partition of organotins were also calculated as the ratio of the concentration of organotins in the sediment to those in the water column just above it. Coefficients of the range of partition of BuSn3+, Bu2Sn2+, Bu3Sn+, PhSn3+, Ph2Sn2+ and Ph3Sn+ were in the range of 102 to 103. By using the dendrograms based on concentration ratio of butyltin homologues, we attampted to estimate the persistent periods of butyltins in water environments.
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