摘要
以合肥市郊的大兴镇和义城镇地区土壤为主要研究对象,利用批量平衡法初步研究了重金属在研究区土壤中的等温吸附特征及其吸附热力学特征。外源磷浓度增大提高土壤对重金属Hg、Pb的吸附能力。在施磷情况下土壤的Hg、Pb吸附自由能均为负值,是常温、常压下可以自发进行的过程,是物理和化学吸附并存的过程。研究区土壤对Hg、Pb吸附过程均是熵增过程。
Soils from two towns of Hefei City in Anhui Province were chosen to investigate the adsorption properties of heavy metals Hg,Pb under the influence of phosphate acid.Batch equilibration method was used in this experiment to study the isotherm adsorption and adsorption thermodynamics characteristics of heavy metals in two typical soils.The results show that phosphate has effects on the absorption of heavy metals.With increasing phosphate,the Hg,Pb absorption also increases.The Hg,Pb absorption Gibbs free energies of the two soils are both negative,indicating that their related chemical processes can take place spontaneously,and that the chemical sorption coexists with the physical sorption.The absorption of Hg,Pb by the two kinds of soils are governed by positive adsorption entropy processes.
出处
《物探与化探》
CAS
CSCD
北大核心
2010年第5期655-658,共4页
Geophysical and Geochemical Exploration
基金
国土资源大调查项目(JH2005-3)
安徽省优秀青年科技基金(08040106907
04045063)
"安徽省生态农业地质调查评价方法技术研究与应用"创新团队资助
关键词
磷肥
水稻土
吸附作用
热力学
重金属
phosphate fertilizer
paddy-soil
adsorption
thermodynamics
heavy metals
