ポスター発表
- 第2日 6月23日（木） P会場（501，502，503）
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2P-08 PDF
昆布中水銀濃度の季節変動と海洋環境評価指標生物としての可能性
In this study, mercury (Hg) concentration of a kelp cultured in northern Hokkaido was determined along its growth line to evaluate whether the concentration of total Hg contained in the kelp reflects Hg concentration in seawater. Resultant Hg concentrations in three samples were around 20 ppb, and its enrichment factor against seawater was calculated to be around 20,000. Isotope ratios of 15N/14N measured along their growth line as well as Hg concentrations indicated that the growth rate-dependent vital dilution effect was small. As the secondary Hg exchange interaction with seawater after growth is small, the Hg concentration in kelp will reflect their surrounding environment at the time of growth, and its high Hg enrichment factor can be useful for bio-monitoring of the surface marine environment.