石灰土与紫色土中铅的等温吸附-解吸特性  

Isothermal Adsorption-desorption Characteristics of Lead in Purple and Calcareous Soil

作　　者：彭达强[1] 谢世友[1,2] 

机构地区：[1]西南大学地理科学学院,重庆400715 [2]西南大学三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《湖北农业科学》2012年第3期493-496,共4页Hubei Agricultural Sciences

基　　金：重庆市自然科学基金重点项目(CSTC2009BA0002);国家公益性行业(林业)科研专项(201204212);国家林业局"948"项目(2009-04-20)

摘　　要：为了探讨铅在紫色土、石灰土中的环境容量,通过野外采样、室内模拟试验对两种土壤中铅的吸附-解吸特性进行了研究。结果表明,铅在紫色土、石灰土中的吸附平衡均可采用Langmuir、Freundlich和Temkin等温吸附方程来拟合,石灰土以Langmuir方程拟合最佳,而紫色土以Freundlich方程拟合最佳;由Langmuir方程求得石灰土对铅的最大吸附量(19 728.77 mg/kg)大于紫色土对铅的最大吸附量(12 194.68 mg/kg);紫色土、石灰土吸附态铅的解吸量都随着铅吸附量的增大而增大,两种土壤的解吸能力都比较弱。研究可为不同类型土壤的铅污染治理提供理论依据。In order to probe into the environmental capacity of lead in purple,calcareous soil and provide a theoretical basis for lead pollution of different types of soil.The adsorption-desorption properties of the two kinds of soil to lead were studied through field sampling,laboratory simulation experiments and equilibrium constant oscillation.The results showed that Langmuir,Freundlich and Temkin＇s adsorption equations could be used to fit adsorption equilibrium of lead in the two kinds of soil.The best fitting was Langmuir＇s equation in calcareous soil and Freundlich＇s equation in purple soil,respectively.The maximum adsorption of lead in calcareous soil was bigger than that in purple soil.Besides,the desorption of lead in the two soils increased with the increase of lead adsorption,but the desorption was weak.

关 键 词：紫色土 石灰土 铅 吸附-解吸 

分 类 号：X131.3[环境科学与工程—环境科学]