劉振宇2006-07-252018-06-292006-07-252018-06-292003http://ntur.lib.ntu.edu.tw//handle/246246/10745砷是具有致癌能力之環境污染物，其毒 性與本身化學型態有關。本研究主要為探 討水產養殖生態系統中砷物種在各介質的 轉移現象。第一年主要在建立砷物種分析 方法及其最佳化，並調查烏腳病地區養殖 池砷物種的分布情況。第二年(本年)則以當 地五口養殖池底泥為材料，針對養殖池底 泥與水體間進行底泥與物種砷之測定及等 溫吸附批次實驗，經檢測底泥總砷含量分 布在14 mg/kg~39 mg/kg，底泥之比重介於 2.24~2.68 之間，孔隙比則介於0.50~0.64 範圍內，兩者變化皆不大。而有機質含量 與現場採樣之底泥總砷含量呈現負相關。 現場底泥等溫吸附實驗結果顯示As3+溶液 與等比溶液(As3+:As5+)之吸附曲線皆屬C 型曲線，表示As3+在水體與底泥吸附表面 間具有固定的分配比例，而As5+溶液吸附 曲線則屬於L 型曲線，顯示As5+吸附作用 小於水分子吸附能力。Arsenic is a known environmental carcinogen with its toxicity depending on its chemical forms. The objective of the study is to investigate the transformation of arsenic speciation among different compartments, such as water, fish, and sediment, of cultural ponds. In the first year, the work was to develop and establish an analytical method of redox sensitive arsenic speciation and to optimize this method. Distribution of arsenic speciation in cultural ponds in the blackfoot disease epidemic area was also investigated. In the second year, the isothermal sorption of batch experiment for arsenic species and sediment among water and sediment were performed for sediments from five local culture ponds. The result indicated that for the sediment, the total arsenic concentration ranges from 14 mg/kg to 39 mg/kg, and the specific gravity and the void ratio lie on 2.24-2.68 and 0.50-0.64, respectively. The variation of the specific gravity and the void ratio is small. The content of organic material possesses negative correlation with the total arsenic concentration of the sediment in the sampled ponds. The result of the isothermal sorption of batch experiment for the sediment in the field indicated that the adsorption isotherm for both As3+ solution and mixed equal concentrations solution (As3+ /As5+) belongs to C type revealing that the ratio of the distribution for As3+ between water and the adsorption surface of the sediment is constant. The adsorption isotherm for As5+ solution belongs to L type revealing that the adsorptive affinity of As5+ is less than that of water molecule.application/pdf261956 bytesapplication/pdfzh-TW國立臺灣大學生物環境系統工程學系暨研究所養殖池底泥As3+As5+等溫吸附批次實驗Cultural pondSedimentArseniteArsenateIsothermal sorptionBatch experimentreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/10745/1/912313B002316.pdf