瀬戸内海における底質中重金属濃度の分布と変化

概要

論文の詳細を見る
The bottom sediment in the Seto Inland Sea taken in the period 1981-1985 and 1991-1994 was investigated to evaluate the change of heavy metal concentrations of the elements, Cd, Pb, Cu, Zn, and Mn. The sea area which had higher concentrations of heavy metals in the 1980s showed a decrease in some area in the 1990s. The test of the difference on average values for Cd, Pb, Zn, and Mn indicated that it was significant at the 1% or 5% level in the entire Seto Inland Sea as well as for the concentration of Cu in the Sea of Hiuchi and Osaka Bay. These results suggest that the regulation of waste water and the decrease in pollutant loadings conducted since 1970s was related to the decline of the heavy metal concentrations in the bottom sediment of the entire Seto Inland Sea. In some sea areas, however, the concentrations of heavy metals in the bottom sediments were maintained at the same level, or became worse than in the 1980s. This shows that it is necessary to make more of an effort to rehabilitate the condition of the bottom sediment
社団法人　日本水環境学会の論文
1998-11-10