| pH、温度对土壤溶液中Cr(Ⅵ)减少速率的影响 |
| 摘要点击 724 全文点击 819 投稿时间：1991-10-15 |
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| 中文关键词 铬 动力学 吸附 还原 土壤环境化学 |
| 英文关键词 Chromium adsorption reduction chromium in soil |
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| 中文摘要 |
| 本文主要研究了土壤溶液中Cr(Ⅵ)的减少速率与pH、温度等因子的关系。结果表明:土壤溶液中Cr(Ⅵ)减少动力学过程可以分为二个步骤,第一步为快速反应,它主要由吸附反应所控制;第二步为慢速反应,主要由Cr(Ⅵ)还原反应所控制。慢反应速率常数k2值和土壤有机质含量显著相关。随着体系中pH值的升高,k1、k2值明显减少。温度对土壤溶液中Cr(Ⅵ)减少速率的影响主要取决于温度对土壤吸附Cr(Ⅵ)反应和Cr(Ⅵ)还原反应的消长情况。 |
| 英文摘要 |
| The process of Cr(Ⅵ) removal from soil solution could be divided into two steps. The first step is a fast reaction depending mainly on the rate of Cr(Ⅵ) adsorption. The second step is a slow reaction depending mainly on the rate of Cr(Ⅵ) reduction. As the pH of soil solution increased, the rate constats, K1 and K2 of Cr(Ⅵ) removal by soils decreased obviously, The influence of temperature on the kinetices of Cr(Ⅵ) removal varied with various soils and was found to be quite complicated. The influence of temperature on the removal of Cr(Ⅵ) are mainly associated with Cr(Ⅵ) adsorption and reduction. |
