本研究場址位於台灣北部一座擁有超過百年歷史的金和銅採礦、冶煉和精煉的廢棄工廠。本研究透過場址外的土壤背景調查和砷、銅的序列萃取法，評估該褐地場址的土地再利用的潛力。研究結果，場外背景濃度的上限值為：砷 300 mg/kg 和銅 700 mg/kg。發現場址內土壤砷的濃度係以穩定不易移動的型態為主，如層狀矽酸鹽結合態的形式存在，故於環境中釋出的風險很低。僅原沉澱池、煉金廠、煉銅廠的土壤中的銅，則有較高比例之可移動相態，如酸可萃取態、可還原態及可氧化態等，故具有較高環境釋出的風險；因此，整個場址除了這三個區域的銅環境釋放風險較高外，其餘區域雖然土壤中全量的砷與銅較高，但序列萃取法指出，這兩個重金屬元素從土壤固相裡釋出的風險很低，可進行不接觸土壤或植栽的土地再利用。面對公眾要求開放場址部分步道以促進當地觀光發展的需求，可透過適當的控制和隔離措施，阻絕重金屬藉由土壤食入、皮膚接觸等暴露途徑而影響人體健康。在各項污染控制方面，降低揚塵吸入也是選項之一，最終使健康風險降低至可接受程度，而達成污染場址土地永續利用之目標。

This study site is located at an abandoned factory of mining, smelting, and refining of gold and copper in north Taiwan for more than one hundred years. The present study used soil background investigation out of the site and the sequential extraction procedures for arsenic and copper to assess the reutilization potential of brownfields at the site. The upper limit of background concentration out of the site was 300 mg/kg for arsenic and 700 mg/kg for copper. The soil arsenic within the site was mainly in the immobile fraction such as forms fixed by layer silicates that was very low risk for environmental releases. The soil copper in the abandoned sedimentation basin, gold refinery, and copper refinery was in the mobile fractions such as acid extractable, reducible, and oxidizable forms with higher release risk; therefore, except merely those three zones in the entire site with higher risk for environmental releases of copper, the release risks of trace elements are quite low in rest of the areas, and land reuse without contact with soil or plant non-edible plants is possible. Therefore, in response to public demand for opening part of the site to promote local tourism development, appropriate control and isolation measures can be implemented to prevent the toxic elements from affecting human health through soil ingestion, skin contact, and other exposure pathways. In terms of pollution control, reducing dust inhalation is also an option to efficiently reduce health risks to an acceptable level and achieve the goal of sustainable land use at the contaminated site.

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