本研究係針對U垃圾焚化廠周界大氣、水體及底泥進行重金屬之採樣與分析，建立U垃圾焚化廠周界大氣、水體及底泥重金屬之背景資料。並收集當地之氣象資料以ISCST模式評估U焚化廠於（一）正常操作狀況下（二）緊急狀況下（三）停爐重新啟動狀況下之重金屬（鉛、鎘、汞）對U淨水場及取水口可能造成之水質影響，以及飲用水中含上述物質濃度對於人體健康風險評估。研究結果歸納如下：1. U垃圾焚化廠周界大氣中重金屬鉛之濃度介於0.0178~0.133 μg/Nm3之間，平均濃度為0.042 μg/Nm3；金屬鎘之濃度介於0.00023~0.0031 μg/Nm3之間，平均濃度為0.000905 μg/Nm3；金屬汞之濃度介於0.000014~0.0015 μg/Nm3之間，平均濃度為0.000362 μg/Nm3。2. U垃圾焚化廠周界水體中重金屬之濃度均以地殼元素錳和鈣濃度較高，其平均濃度分別為19.9 mg/L及47.4 mg/L，金屬鉛之濃度介於ND~0.008 mg/L之間；金屬鎘之濃度介於ND~0.00154 mg/L之間；金屬汞四次之濃度均低於偵測極限。3. U垃圾焚化廠周界底泥中重金屬之含量均以鎂、鈣與鐵含量最高，其平均含量分別為1645、6709及23572 μg/g。金屬鉛之含量介於4.34~33.7 μg/g之間，平均為12.8 μg/g；金屬鎘之含量前兩季均低於偵測極限，後兩季之含量介於0.007~0.035 μg/g之間，平均為0.0215 μg/g；金屬汞之含量前兩季亦均低於偵測極限，後兩季之含量介於.0016~0.0440 μg/g之間，平均為0.0619 μg/g。4. 模擬U焚化廠於一般操作狀況下排放煙道廢氣之重金屬鉛、鎘及汞之平均沈降率分別為鉛沈降率介於12.2～15.8 ng/m2．day，平均值為14.0 ng/m2．day；鎘沈降率介於1.83～2.37 ng/m2．day，平均值為2.10 ng/m2．day；汞沈降率介於1.83～2.37 ng/m2．day，平均值為2.10 ng/m2．day。5. 模擬U焚化廠於緊急狀況下排放煙道廢氣之重金屬鉛、鎘及汞之平均沈降率分別為鉛沈降率介於848～1134 μg/m2．day，平均值為986 μg/m2．day；鎘沈降率介於165～220 μg/m2．day，平均值為191 μg/m2．day；汞沈降率介於160～214 μg/m2．day，平均值為186 μg/m2．day。6. 模擬U焚化廠於停爐重新啟動狀況下排放煙道廢氣之重金屬鉛、鎘及汞之平均沈降率分別為鉛沈降率介於6783～9074 μg/m2．day，平均值為7885 μg/m2．day；鎘沈降率介於1017～1361 μg/m2．day，平均值為1183 μg/m2．day；汞沈降率介於1017～1361 μg/m2．day，平均值為1183 μg/m2．day。7. 重金屬鎘及汞之危害商數分別為5.47×10-10與9.12×10-10，其值遠低於1之危害風險管理值上限。

　　This study is to characterize the heavy metals from ambient air, water and sediment surrounding the U incinerator. We already established the background of it’s surrounding environment and collected local information of meteorology. Using these data and the ISCST3 model was used to estimate the influence of heavy metals ( Pb, Cd, Hg ) emitting from the U incinerator to the quality of water inlet and the water treatment plant in following conditions：1. normal operation 2. emergency effluent 3. re-operation. Furthermore, to evaluate the risk of public health. The study results were as follows : 1. the concentration of Pb in ambient air ranged from 0.0178 to 0.133 μg/Nm3 (mean＝0.042 μg/Nm3 ), concentration of Cd ranged from 0.00023 to 0.0031 μg/Nm3 (mean＝0.000905 μg/Nm3 ), and concentration of Hg ranged from 0.000014 to 0.0015 μg/Nm3 (mean＝0.000362 μg/Nm3 ). 2. the concentration of Mn

( mean＝19.9 mg/L ) and Ca ( mean＝47.4 mg/L ) were higher than other metals in water. Concentration of Pb in water ranged from ND to 0.008 mg/L, concentration of Cd ranged from ND to 0.00154 mg/L, and concentration of Hg is ND. 3. Concentration of Mg ( mean＝1645 μg/g ), Ca ( mean＝6709 μg/g ), Fe ( mean＝23572μg/g ) were higher than other metals in bottom sediments. The content of Pb ranged from 4.34 to 33.7 μg/g ( mean＝12.8 μg/g ), content of Cd ranged from 0.007 to 0.035 μg/g ( mean＝0.0215 μg/g ), and content of Hg ranged from ND to 0.0440 μg/g( mean＝0.0619 μg/g ). 4. In normal operation of the incinerator, the deposition of Pb ranged from 12.2 to 15.8 ng/m2．day ( mean＝14.0 ng/m2．day ), deposition of Cd ranged from 1.83 to 2.37 ng/m2．day ( mean＝2.10 ng/m2．day ), deposition of Hg ranged from 1.83 to 2.37 ng/m2．day (mean＝2.10 ng/m2．day ). 5. In emergency effluent, the deposition of Pb ranged from 848 to 1134 μg/m2．day ( mean＝986 μg/m2．day ), deposition of Cd ranged from 165 to 220 μg/m2．day ( mean＝191 μg/m2．day ), deposition of Hg ranged from 160 to 214 μg/m2．day ( mean＝186 μg/m2．day ). 6. In re-operation state, the deposition of Pb ranged from 6783 to 9074 μg/m2．day ( mean＝7885 μg/m2．day ), deposition of Cd ranged from 1017 to 1361 μg/m2．day ( mean＝1183 μg/m2．day ), deposition of Hg ranged from 1017 to 1361 μg/m2．day ( mean＝1183 μg/m2．day ). 7. the Hazard Quotient of the Cd and Hg were 5.47×10-10 and 9.12×10-10, both were lower than 1 which is the Hazard Quotient in law.

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