土壤水环境中污染物运移双点吸附解吸动力学模型

在考虑对流弥散、平衡/非平衡双点吸附解吸、微生物降解等情况下，建立了土壤环境中有机污染物迁移转化的动力学模型，并给出了有限差分解。在此模型的基础上，详细讨论了有机污染物在土壤中的分布规律，并对一阶吸附解吸速率常数 和平衡吸附点位所占总点位的比例 进行了灵敏度分析。分析研究表明：参数 对于土壤中有机污染物浓度分布有着重要的影响，其影响程度又与非平衡吸附点位所占总点位的比例（1- ）有关；污染后期土壤吸附相的存在，也会起到增加土壤水溶质浓度的作用，且 越大，这种作用越明显。

Kinetic model of contaminant transport in soil-water system considering two-site absorption-desorption

Considering the environment behaviors of contaminant in soil,such as diffusion,equilibrium/nonequilibrium two-site absorption-desorption and microbiological degradation,the kinetic model of the contaminants transport in soil is established;and its finite difference equation is given.Based on it,the distribution regularities of the contaminant concentration in soil are discussed in detail;and the sensitivities of parameters k and f are analyzed.The study shows that the parameter k has important influence on the concentration distribution in soil and the influence degree is also related to the proportion(1-f) of nonequilibrium sites to total sites;At the later stage of pollution,the existence of absorption phase may increases the solute concentration in the water in soil;and the lager is k,the more obvious is the influence.