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題 名 | 鉻酸鹽在土壤中的吸持(1)=The Sorption of Chromate in Soil (1) |
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作 者 | 鄒裕民; 陳益榮; 王明光; | 書刊名 | 中國農業化學會誌 |
卷 期 | 35:6 1997.12[民86.12] |
頁 次 | 頁641-651 |
分類號 | 434.223 |
關鍵詞 | (重)鉻酸鹽; 脫附; Chromate; Desorption; |
語 文 | 中文(Chinese) |
中文摘要 | Cr( VI )對動植物均有害, 且其物種為陰離子形態,與絕大多數的重金屬陽離 子在土壤中的反應有所不同,在中、�堜吨g壤土粒的帶負電性質往往對其吸附幫助不大;至 於酸性土壤,其對鉻陰離子的吸附限於鐵、鋁氧化物,黏土礦物如高嶺石之邊緣所產生的淨 正電荷中,然而 Cr ( VI )陰離子並不像磷酸鹽、硫酸鹽對黏土礦物吸附性強,易遭專一 性吸附之陰離子所脫附而由土柱中淋溶出來,一旦廢棄物施入土壤中,其在土壤剖面移動性 及對地下水的危害頗令人憂心,故研究其在土壤中吸附行為,乃瞭解它在土柱中物化性質的 初步及解決污染的必要性工作。本研究以桃園酸性土壤及西螺的鹼性土壤做為材料,研究鉻 的吸附行為。 實驗結果顯示, 西螺土壤對鉻酸鹽的吸持量遠低於桃園土壤,土壤對 Cr ( VI )的吸持,受背景電解質的影響。 酸性桃園土壤,氯離子對鉻酸鹽吸持的影響最小,過 氯酸離子次之,而硫酸根離子最大;鹼性西螺土壤此三種背景電解質對鉻吸持影響差異不大 。以磷酸根離子脫附鉻之實驗顯示,桃園土壤鉻的脫附量隨初始施入鉻濃度的增高而加大, 隨鉻平衡吸附時間的增加而逐漸下降,西螺土壤鉻的脫附量較不受鉻反應平衡時間的影響。 |
英文摘要 | Cr(VI) is a toxic element for plants and animals. Chromate is an anionic species, and its behavior in soils is quite different from that of other heavy metals. The negative charge of soil particles in neutral and alkaline soils can not sorb chromate. However, in acid soils, both the broken edge of kaolinite and Al- and Fe oxides bearing a positive charge can sorb chromate anions. The bonding strength of chromate anion is not line that of specific phosphate and sulfate anions; thus, chromate is easily desorbed by these specific anions and leached through soil column. Once Cr(VI) contaminates soils, it can become mobile in the soil profiles and cause a hazard for ground water. To understand the physic/chemical characteristics of Cr(VI) and to resolve pollution problems, it is necessary to study the adsorption behavor of Cr(VI) in soils. The Tao-Yung acid soil and Si-Lo alkaline soil were employed for the study of Cr(VI) sorption. Experimental results indicated that Cr(VI) by soils was affected by electrolytes solutions. Nonspecific anions influenced Cr(VI) adsorption by Tao-Yuan acid soils in the following order: C1<C1O �� <SO �荼滋�. On the other hand, in alkaline Si-Lo soils, these three electrolyte solutions show slight differences of Cr(VI) adsorption. In the experiment on phosphate replace chromate in the Tao-Yuan acid soil, the amount of chromate desorbed by phosphate increased with increasing Cr(VI) concentrations and decreased with an increase in the equilibrated time. However, chromate desorption was not affected by the equilibrated time in the alkaline Si-Lo soil. |
本系統中英文摘要資訊取自各篇刊載內容。