台灣東部之海岸山脈，分佈有經歷熱水換質後之斑狀安山岩，台東縣三仙台為此斑狀安山岩蘊藏量最多的地區之ㄧ。本研究為探討三仙台斑狀安山岩對水中重金屬之去除作用，以XRF、XRD分析三仙台斑狀安山岩之礦物相，並將其與含砷、鎘、銅、鉛、鋅等重金屬之溶液進行反應，藉以比較單溶質與多溶質系統、水溶液初始濃度（超純水、各重金屬濃度為0.1 ppm、1 ppm、10 ppm）、岩樣粒徑（14-18、18-35、35-50 mesh）、水溶液與岩樣比例（5:1、10:1、20:1）等條件改變下，反應後各重金屬濃度變化。再以酸洗法將反應後樣本之重金屬淋洗至溶液中，以研究三仙台斑狀安山岩對水中重金屬去除作用之反應機制。
全岩XRD分析結果，三仙台斑狀安山岩為受蝕變之斑狀安山岩，其主要礦物相為斜長石、角閃石、輝石、石英，少部份樣本含有斜髮沸石。將含有沸石之三仙台斑狀安山岩樣本A與未含有沸石相礦物之樣本B進行黏粒試片分析，顯示除了主要礦物相外，樣本A含有斜髮沸石、少量伊萊石與少量黏土礦物，樣本B則含有伊萊石，且樣本B伊萊石含量較樣本A高。
以三仙台斑狀安山岩之樣本A、B進行去除水中重金屬試驗，在多溶質系統且溶液初始濃度較高時可見重金屬之競爭效應，而對於不同重金屬的去除效果與元素電負度相關，樣本A、B對此五種元素之去除率，由高至低分別為：鉛 > 銅 > 鎘 ≧ 鋅 > 砷，其中砷與樣本表面電性相斥而去除率偏低。兩樣本間，樣本A之重金屬去除量皆優於樣本B，為兩樣本進行反應之礦物相含量或種類不同所致。岩樣粒徑與水岩比對於此次試驗並無太大之影響。
以樣本溶釋之陽離子溶出量總和、酸洗法試驗結果、重金屬去除量擬合吸附模式等方式判斷各重金屬之反應機制，顯示樣本A、B皆同時有吸附作用與離子交換進行反應，各重金屬受到兩種機制作用，而偏重於其中之一反應機制所主導。同一重金屬於樣本A、B之反應機制不同，為兩樣本進行反應之礦物相種類不同所致，樣本A進行離子交換之礦物相主要為斜髮沸石，而以少量黏土礦物主導吸附作用；樣本B影響離子交換與吸附作用之礦物相皆為伊萊石，對於不同重金屬分別偏重於不同反應機制所主導。

Altered porphyritic andesite samples from Sansiantai were analyzed their compositions and ability of removing heavy metals from drinking water. The effects of removing different heavy metals were related to the electronegativity values, hence the removal percentage of the metals for both zeolite-containing sample A and zeolite-lacking sample B were in the following order Pb > Cu > Cd > Zn > As. Modeling showed that the heavy metals were removed by adsorption and ion exchange simultaneously, and each metal tended to be dominated by one of the mechanisms to remove. For sample A, the metals were removed by adsorption with clay mineral and ion exchange with zeolite. For sample B, the two mechanisms of heavy metal removal were onto illite.

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