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(15-21) Modeling Approach to Estimate Concentrations of Polychlorinated Dibenzo-p-dioxines and Polychlorinated Dibenzofurans in Air and Soil in the Kanto Area of Japan. Higashino, Haruyuki*,1, Yoshida, Kikuo1, Yonezawa, Yoshitaka1, Sanjo, Hideaki2, 1 Research Center for Chemical Risk Management, Tsukuba, Ibaraki, JAPAN2 Graduate School of Frontier Sciences, Bukyo-ku, Tokyo, JAPAN ABSTRACT- The distribution of concentrations of polychlorinated dibenzo-p-dioxines (PCDDs) and polychlorinated dibenzofurans (PCDFs) in air and soil and deposition in the Kanto region were estimated by using the fate model. The model used in the simulation was based on the fate model published in the former report, which could estimate concentrations in atmosphere with the space resolution of 5×5km, including some revises in the deposition process. The emission source for the simulation was limited only from municipal waste incineration facilities, because other kinds of emissions have many uncertain factors to estimate source inventories at present. The total amount of dioxins emissions discharged in the analytical domain (including Tokyo and other 6 prefectures in Kanto area) was estimated 711 gTEQ/y. Estimated concentrations were generally lower than the monitored values. The maximum concentration in the analytical domain was estimated 0.4 pgTEQ/m3. The result will be reasonable since sources other than the municipal waste incineration were not accounted. Annual deposition amount of dioxins in the analytical domain was estimated 93 gTEQ/y, and annual deposition on the land except the Tokyo bay was estimated 88 gTEQ/y. Key words: dioxins, fate model, deposition, Kanto area |
