摘要
采用平衡液吸附法和NH4AC、EDTA溶液解吸法,研究了有机质对Cu2+在棕壤及其各粒级微团聚体中(<10μm,10～50μm,50～250μm)的吸附解吸过程中的影响,为寻求有效控制土壤中Cu2+环境行为的对策措施提供理论支撑。研究结果表明,各粒级微团聚体中有机质对Cu2+的吸附能力随粒级的减小而增强,原土仅次于<10μm微团聚体。就吸附机制而言,去除有机质后的原土及其各粒级微团聚体在不同吸附机制控制下的吸附能力也有所变化,表现为:去除有机质后,棕壤及各粒级微团聚体对Cu2+的静电吸附能力增强,络合吸附能力和专性吸附的能力均有所降低。分析表明,原土及其不同粒级微团聚体对Cu2+的吸附能力及稳定性的差异,与其重要组成成分有机质有关。
Characteristics of adsorption-desorption of Cu^2＋ by ultrasonic dispersion and organic matter in bulk brown earth sample （BS） and several different particle size （〈10μm, 10-50 μm and 50-250 μm） microaggregate fractions （MA） extracted from it were investigated, by the methods of equilibrium adsorption and desorption by NH4AC and EDTA solution respectively, with the purpose of providing scientific basis for effectively controlling Cu environmental behavior in soils. The results showed that, adsorption capacities of CuE＋by the three studied microaggregate fractions followed the order of 〈10 μm OM〉BS〉10-50μm OM〉50-250 μm OM. and that there were significant difference in adsorption quantity controlled by different adsorption mechanism of Cu^2＋ among tested bulk soil and its microaggregate fractions： Electrostatic adsorption capacity of the soil improved after dissecting the organic matter, but the complex and specific adsorption reduced. The analysis showed that adsorption capacity and mechanism of Cu^2＋ by bulk soil and its microaggregate fractions were closely related to the important component organic matter.
出处
《生态环境学报》
CSCD
北大核心
2009年第2期498-501,共4页
Ecology and Environmental Sciences
关键词
棕壤
有机质
微团聚体
CU2+
吸附
解吸
Bulk earth
organic matter
microaggregate
Cu
adsorption
desorption
particle size
