氨氮在土壤中的吸附/解吸动力学行为的研究  

Ammonia Absorption/desorption Behavior in Soil

作　　者：孙大志[1] 李绪谦[1] 潘晓峰[1] 

机构地区：[1]吉林大学环境与资源学院

出　　处：《环境科学与技术》2007年第8期16-18,111,共4页Environmental Science & Technology

基　　金：国家重点基础研究项目(973)(2004CB418505)

摘　　要：文章主要研究氨氮在土壤中吸附/解吸动力学和热力学行为及其影响因素。通过对氨氮吸附/解吸动力学的研究发现,氨氮的吸附和解吸基本都符合一级反应动力学方程。通过对氨氮热力学的研究发现,氨氮的吸附等温式既不符合Langmuir,也不符合Freundlich。我们考察吸附剂大小、吸附剂含量、pH值、温度的因素对氨氮吸附等温线的影响,研究发现,粒度越小,pH值越大、温度越低,土壤对氨氮的吸附能力越强,而土壤和溶液的最佳配比还有待于进一步考察。此外,通过对温度的考察发现,土壤对氨氮的吸附属于物理吸附。Behavior of dynamics and thermodynamics of ammonia absorption/desorption as well as its influence factor in soil was studied, Results showed that absorption and desorption of ammonia in soil fits the first -order reaction model. The adsorption isotherms cannot be described by either Langmuir or Freundlich. Ability of absorption will become stronger with increase of pH, low temperature and small soil granularity, while the fitting match between soil and solution need to be studied. The absorption was physical according to thermodynamic analysis.

关 键 词：氨氮 动力学 吸附等温线 热力学 

分 类 号：X131.3[环境科学与工程—环境科学]