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研究生:陳逸凡
研究生(外文):Yi-Fen Chen
論文名稱:台灣地區不同土系土壤膠體組成分對鎘吸附作用的影響
論文名稱(外文):The Influence of Colloidal Components from Different Soil Series on The Sorption of Cadmium in Taiwan
指導教授:許正一許正一引用關係鄭双福鄭双福引用關係
指導教授(外文):Zeng-Yei HseuShuang-Fu Cheng
學位類別:碩士
校院名稱:國立屏東科技大學
系所名稱:環境工程與科學系
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:68
中文關鍵詞:粘粒膠體吸附作用
外文關鍵詞:CadmiumClayColloidAdsorption
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重金屬是台灣地區主要的土壤污染問題之一,而影響重金屬吸附作用的土壤固相組成中,以帶有電荷之矽酸鹽粘粒、鐵氧化物與有機物等土壤膠體最為重要。雖然曾有許多學者探討土壤對重金屬之吸附特性,但對於矽酸鹽礦物、游離鐵與有機物交互作用下之土壤膠體對於重金屬吸附作用的影響,過去的相關研究成果並不多見。因此,本論文就台灣地區常見的農田土壤污染重金屬鎘,選擇矽酸鹽粘粒、有機質及游離鐵含量差異較大之龍潭土壤(龍中系(Lt),鐵網紋厚育浸水極育土)及長濱土壤(三台系(St),典型簡育濕潤膨轉土),先分別以雙氧水及連二亞硫酸鈉-檸檬酸鈉-碳酸氫鈉(DCB)混合抽出液去除有機物及游離鐵氧化物,再將矽酸鹽粘粒(<2.0μm)細分成粗(0.2-2.0μm)與細(<0.2μm)粘粒,以探討鎘在不同粒徑粘粒吸附作用之影響。
結果顯示,以Langmuir方程式描述本論文之等溫吸附,其決定係數均在0.94以上。比較不同粒徑粘粒對鎘之吸附量,發現兩種土壤均顯示細粘粒之鎘吸附量最高,粗粘粒次之,而全部粘粒最低,此乃因粒徑愈細,比表面積與CEC值較大,故造成吸附量提高。兩種供試土壤去除有機質後之粘粒,對鎘之吸附量明顯下降,但進一步去除游離鐵後之粘粒,會因其減低對黏土礦物之包覆而使鎘吸附量增加。當pH值愈高時,會造成粘粒表面產生較多的可變電荷量,因而增加鎘之吸附量。
Heavy metal contamination is one of soil pollution problems. The major factors of affecting heavy metal adsorption are the colloid components including silicate clays, organic matter (OM) and Fe oxides. Past studies had discussed the adsorption characteristics of heavy metal in soil, but little was related to the interactions of different soil colloids. Cadmium contamination is popularly found in the arable soils of Taiwan. Therefore, Lungchung (Lt, Plinthic Paleaquult) and Santai (St, Typic Hapludert) series with diverse silicate clay, organic matter (OM) and Free Fe oxide (Fed) contents were selected to study Cd adsorption. Clays of the two soils were separated into coarse (0.2-2.0μm) and fine (<0.2μm) fractions after removal of H2O2 and dithionite-citrate-bicarbonate (DCB) extract to remove OM and Fed, respectively.
Results indicate that the determining coefficients (R2) are more than 0.9 in describing the adsorption isotherms of Ca by Langmuir equation. This is related to higher smectite with large specific surface in the St soil. For the two soils, the sequence of adsorption amount of Cd in different clay fractions is fine clay > coarse clay > whole clay, respectively. Higher specific surface and CEC values of finer sized particles cause to increase the adsorption amount of Cd. When OM was removed, the adsorption amount of Cd decreased. But the adsorption amount of Cd increased with the removal of Fed for the H2O2 treated clays, this is resulted from the coating of Fe oxide on the mineral surface to the exposure of adsorption sites. When soil pH increase, the adsorption amount of Cd increased associated with higher variable negative charge on the clay surface.
目 錄
頁次
中文摘要 I
英文摘要 III
誌謝 V
目錄 VI
表目錄 IX
圖目錄 X
第一章 前言 1
1.1 研究動機 1
1.2 研究目的 1
第二章 文獻回顧 4
2.1 鎘之來源及特性 4
2.2 土壤吸附作用 4
2.3土壤理化性質對重金屬吸附作用之影響 5
2.3.1 土壤質地 5
2.3.2 pH值 5
2.4等溫吸附曲線 7
2.5土壤膠體組成分對重金屬吸附作用之影響 8
2.5.1 矽酸鹽粘土礦物 8
2.5.2 金屬氧化物 9
2.5.3 有機物 11
2.5.4 土壤膠體種類 12
2.5.5 不同膠體組合對重金屬吸附作用的影響 13
2.5.6 礦物種類 15
2.6脫附作用 15
第三章 材料與方法 17
3.1供試土壤之採集 17
3.1.1土樣來源 17
3.2供試土壤基本性質 17
3.2.1基本性質分析 17
3.2.2土樣前處理 19
3.3鎘吸附實驗 20
3.3.1土壤溶液配製 20
3.3.2不同pH值對鎘之吸附試驗 22
3.3.3脫附實驗 22
3.4土壤粘土礦物組成鑑定 23
3.5土壤粘粒之官能基分析 23
第四章 結果與討論 25
4.1 供試粘粒基本性質分析 25
4.2 土壤粘土礦物種類分析 25
4.2.1 龍潭土壤 25
4.2.2 長濱土壤 30
4.3 土壤粘粒官能基種類分析 34
4.3.1 龍潭土壤 34
4.3.2 長濱土壤 36
4.4 等溫吸附曲線之選用 36
4.5 二種土壤中膠體對鎘之吸附 39
4.5.1 不同粒徑膠體對鎘之吸附 39
4.5.2 不同膠體組成對鎘之吸附 46
4.5.3 不同pH值下膠體對鎘之吸附 52
4.5.4 最大吸附量比較 53
4.6 脫附率比較 54
第五章 結論 58
第六章 參考文獻 60
六、參考文獻
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