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題名 | 以EDTA萃取配合物理序列沉降法復育受鎘及鉛污染土壤之初步研究=Preliminary Study on the Remediation of Lead and Cadmium Spiked Soils Using EDTA Extraction and Sequential Sedimentation |
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作者 | 薩支高; 溫一倉; | 書刊名 | 中國農業化學會誌 |
卷期 | 36:6 1998.12[民87.12] |
頁次 | 頁565-575 |
分類號 | 434.227 |
關鍵詞 | EDTA萃取; 序列沉降; 史脫克斯定律; 鎘及鉛污染土壤; EDTA extraction; Contaminated soils; Sequential sedimentation; Stock's law; |
語文 | 中文(Chinese) |
中文摘要 | 本研究以三種模擬受鎘及鉛污染之土壤為材料,藉重金屬在不同大小土壤顆粒中 吸附分佈的差異來探討EDTA萃取及序列沉降移除法的可行性。結果顯示供試土壤間pH值差異 可能是影響不同土壤對鎘及鉛吸附力、土壤中低能鍵結鎘及鉛比例、及水洗效率的主因之一 。土壤中鎘的EDTA萃取與水洗效率多高於鉛,由鎘及鉛的化學型態分佈亦可證實。經EDTA 萃取並配合序列沉降技術,只含約10%鉛或5%鎘但占60%至90%土壤質量的較粗顆粒可與黏粒 懸浮溶液分離。若以水洗配合土壤序列沉降,供試二種中性及鹼性土壤中的鎘僅約40%被移 於黏粒懸浮溶液中,酸性土中鎘則有80%分布於黏粒溶液中。經萃取或水洗及序列沉降後發 現粘粒中多含有最高濃度的鉛及鎘。相同土壤中粗細顆粒間的吸附量只與表面積有關而無吸 附強弱分別,故在萃取或水洗後不同粒徑上的鉛及鎘以等比例降低,濃度與表面積的關係亦 多為線性。土壤污染復育若能先以小規模試驗判定欲達成標準的條件,再選擇萃取液種類及 沉澱顆粒的配比,經測定相關參數如溫度及液體密度後,以史脫克斯定律(Stokes' Law) 計算沉澱所需時間應可有效達到復育效果。 |
英文摘要 | Three Cd and Pb spiked soils with unique characteristics were selected as materials for assessing the feasibility of remediating heavy metal contaminated soils using EDTA extraction and sequential sedimentation. The results indicated that the soil pH influenced the adsorption capacity of soil for Cd and Pb, the percentage of low-energy bonding Cd and Pb, and the water washing efficiency. EDTA and water washed more soil Cd than Pb because of the difference of their binding strength. This can also be supported by the fact that soil Cd was mainly in exchangeable form, in contrast that Pb was in carbonate and Fe-Mn oxide bound forms. Using EDTA extraction and sequential sedimentation, it was found that only about 10% of Pb or 5% Cd existed in sandy and silt-size particles, which Results indicated that significant variation in rice hardness correlated with the microstructure of rice kernel endosperm occurred among the different rice varieties. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。