| 重金属铜在黑土和棕壤中解吸行为的比较 |
| 摘要点击 2713 全文点击 2334 投稿时间：2003-03-14 修订日期：2003-05-26 |
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| 中文关键词 Cu2+ 解吸 热力学 动力学 黑土 棕壤 |
| 英文关键词 Cu2+ desorption thermodynamic process kinetic process phaeozem burozem |
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| 中文摘要 |
| 采用一次平衡法研究吸附态Cu2+在黑土和棕壤上的解吸行为并进行了比较.结果表明,与棕壤相比,黑土吸附态Cu2+解吸有更长的滞后阶段,黑土在Cu2+的吸附量低于729.00mg·kg-1(Cu2+处理浓度小于40 mg·L-1),棕壤在Cu2+的吸附量低于393.29 mg·kg-1(Gu2+处理浓度小于20 mg·L-1)时,土壤吸附态Cu2+几乎不发生解吸.2种土壤吸附态Cu2+的解吸率均较低,尤其是黑土.在试验所采用的Gu2+处理浓度范围内,黑土与棕壤吸附态Cu2+的最高解吸率分别为6.60%和13.56%.Freundlich方程为描述2种土壤Cu2+等温解吸过程的最佳方程.黑土和棕壤吸附态Cu2+的解吸速率均较快,在40min左右基本达到平衡.描述黑土和棕壤解吸动力学过程的最优模型为双常数速率方程,其次为Elovich方程. |
| 英文摘要 |
| Desorptive behavior of Cu2+ from phaeozem and burozem was studied and compared using the batch method. The results indicated that Cu2+ desorbed from phaeozem tested had a longer lag period than that from burozem. When adsorbed Cu2+ for phaeozem was lower than 729.00 mg·kg-1 (Cu2+ concentration was lower than 40 mg·L-1), and on burozem was lower than 393.29 mg·kg-1 (Cu2+ concentration was lower than 20 mg·L-1), adsorbed Cu2+ was hardly desorbed. Meanwhile, the desorption ratio of Cu2+ from the two soils were both low, especially for phaeozem. In the range of Cu2+ concentration used in the experiments, the desorption rate maximums of Cu2+ for phaeozem and burozem were respectively 6.60% and 13.56%. Freundlich equation could best describe desorption isotherm processes of Cu2+ from the two soils. Adsorbed Cu2+ on soils was desorbed so fast from phaeozem and burozem that the desorption equilibrium could be reached only after 40 min desorption. The best model to describe Cu2+ desorption kinetics was two-constant equations, followed by the Elovich equation. |
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