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k_2值和土壤有机质含量显著相关。随着体系中pH值的升高,k_1、k_2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。
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.
出处
《环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1992年第3期7-10,共4页
Environmental Science
关键词
吸附
土壤
监测
还原
环境化学
Chromium, adsorption, reduction, chro-mium in soil.
