土壤学报2012，Vol.49Issue(2)：311-318,8.
阴离子对可变电荷土壤吸附铜离子的影响机理
MECHANISM OF ANION EFFECT ON ADSORPTION OF Cu2+ BY VARIABLE CHARGE SOILS
摘要
Abstract
Based on comparison between the effects of NO, , Cl and SO4 on the adsorption of Cu * by variable charge and constant charge soils, the mechanism of the anion effect was studied. Results show that when the initial concentrations of NO~ , Cl and SO4~ in the systems studied were identical, the adsorption percentage of Cu2 + by Hyper-Rho-dic Ferralsol was larger in the S04~ system than in the NO, and Cl systems, while the adsorption percentage of Cu2+ by Cambisol in the three anion systems were very close to each other. The adsorption percentage of Cu2+ by Rhodic Ferralsol in the systems containing different concentrations of NaCl differed insignificantly, suggesting the effect of ionic strength on the adsorption of Cu + by variable charge soils was small. The adsorption percentage of Cu + by Hyper-Rhodic Ferralsol in the systems containing N03~ , Cl and S04~ increased with increasing pH of the media. At the same pH value, the percentage in the system containing N03 was close to that in the system containing Cl , but lower than that in the system containing S04 . The adsorption percentage of Cu * by Hyper-Rhodic Ferralsol and Rhodic Ferralsol decreased with increasing concentration of Na2SO4. However, the percentages were larger in the systems containing 0.005 mol L ' and 0. 05 mol L~' Na2SO4, but smaller in the system containing 0. 5 mol L1 Na2S04than in the system without Na2SO4. On the other hand, all the adsorption percentages of Cu + by Cambisol were smaller in the systems containing different concentrations of Na2SO4 than in the system without Na2SO4. It is, therefore, concluded that kind of anion species can affect the adsorption of Cu by soils through changing the ionic strength of the media, the degree of formation of ion-pairs and the specific adsorption of anions by soils. The mechanism of anion effect on the adsorption of Cu + is more complicated in variable charge soils than in constant charge soils.关键词
可变电荷土壤/Cu2+/吸附/阴离子Key words
Variable charge soil/ Cu + / Adsorption/ Anion分类
农业科技引用本文复制引用
邹献中,姜军,赵安珍,季国亮..阴离子对可变电荷土壤吸附铜离子的影响机理[J].土壤学报,2012,49(2):311-318,8.基金项目
广东省重点科技攻关计划项目(2005A3040200)、国家自然科学基金项目(No.40701079)、广东省科技计划项目(2009B030802038)、广州市农业科技项目(GZC100208015)和广东省农科院博士启动项目资助 （2005A3040200）
