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題名 | 鉻酸鹽在土壤中的吸持(2)=The Sorption of Chromate in Soil(2) |
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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 | 36:1 1998.02[民87.02] |
頁次 | 頁77-90 |
分類號 | 434.223 |
關鍵詞 | 還原; 孵育; FeSO[feb2]; Redox; Incubation; FeSO[feb2]; |
語文 | 中文(Chinese) |
中文摘要 | 六價鉻酸鹽離子由於在西螺及桃園土壤吸附能力不強,因此容易為其他陰離子交 換淋洗出來, 所幸 Cr( Ⅵ ) 陰離子為一強氧化劑, 其能被有機質、Fe( Ⅱ ) 或 H �� S 迅速還原為 Cr( Ⅲ ) 形態,降低 Cr( Ⅵ ) 的毒性,因此如何增加土壤對六價鉻的吸持及 還原能力,乃為本研究的重點。 實驗結果顯示, 土壤加入 Cr( Ⅵ ) 後於不同水份含量下進行孵育,Cr( Ⅵ ) 的吸持及還 原量均會隨孵育時間的延長而增加, 然而於飽和水份含量的管理下,Cr( Ⅵ ) 的吸持及還 原量較低。而外加還原劑以 FeSO �笠棜鴗遙欞怐滲鄐O最高也最迅速,但是此還原能力會隨 著孵育時間的延長及孵育溫度之提高而逐漸下降。加入葡萄糖之處理會加速土壤成為還原狀 態,此有利於六價鉻的還原。土壤有磷肥處理者,其會與鉻酸競爭吸附位置,降低六價鉻的 吸持。 |
英文摘要 | Low sorption capacity of Cr(Ⅵ) in the Si-Lo and Tao-Yuan soils, it is due to the exchange of Cr( Ⅵ ) from clay surface by other anions. However, Cr( Ⅵ ) anion is a strong oxidant which can easily reduced by organic matter, Fe( Ⅱ ) and/or H �� S to Cr( Ⅲ ) species thus, released the toxicity of Cr( Ⅵ ). The objective of this study was to enhance the Cr( Ⅵ ) sorption ability by soil and the reduction in the soil system. Experimental results indicated when Cr( Ⅵ ) was incubated under various conditions of soil water contents, the sorption of Cr and reduction of Cr( Ⅵ ) to Cr( Ⅲ ) increase with increasing incubated time; however, incubation under saturated water conditions slowed down the sorption and reduction of Cr. In addition of FeSO �� reached the ability of Cr( Ⅵ ) reducing to Cr( Ⅲ ). The reduction ability decreased with extension of incubated time and with increased incubation of temperature. The addition of glucose to soils accerated the reduction in the soils. Phosphate anion reduced the Cr( Ⅵ ) sorption and competited the sorption sites in soils. |
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