わが国における土壌中有機化合物の暴露量推定 : 地圏環境評価システムの開発に関する研究

概要

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We have developed the geo-environmental risk assessment model for organic compounds, which are considered both soil properties and exposure factors specific to Japanese situations. The exposure rates, the distribution of exposure paths and the risk level of soil content to the human have been evaluated by using this model.Since the Japanese soil have the specific properties, i.e. high fraction of organic carbon content, it is difficult to transport into the groundwater and the air in comparison with other kinds of soil. The exposure rates of children are higher than those of adults. Especially, infants aged 0 to 2 are much more exposed to the organic compounds. The major exposure paths to the human are different due to the kind of organic compounds. The human are mainly exposed to dichloromethane and 1,4-dioxane from groundwater intake, whereas they are mainly exposed 1,2-dichloroethane and 1,1,2-trichloroethane from inhalation of indoor air. The leaching concentrations of exposure limit are estimated at 0.06mg/dm3 for dichloromethane, 2mg/dm3 for 1,1,1-trichloroethane, 0.002mg/dm3 for tetrachloromethane, 0.05mg/dm3 for tetrachloroethene, 0.1mg/dm3 for trichloroethene, 0.03mg/dm3 for cis-1,2-dichloroethene, 0.02mg/dm3 for 1,1-dichloroethene, 0.02mg/dm3 for benzene and 0.2mg/dm3 for 1,4-dioxane.
社団法人資源・素材学会の論文
2005-01-25