| 砷酸根在可变电荷土壤颗粒表面的配位吸附 |
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| 引用本文： | 王永,徐仁扣,王火焰,姜军.砷酸根在可变电荷土壤颗粒表面的配位吸附[J].环境化学,2009,28(2). |
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| 作者姓名： | 王永 徐仁扣 王火焰 姜军 |
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| 作者单位： | 1. 中国科学院南京土壤研究所,土壤与农业可持续发展国家重点实验室,南京,210008;中国科学院研究生院,北京,100049
2. 中国科学院南京土壤研究所,土壤与农业可持续发展国家重点实验室,南京,210008 |
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| 摘 要： | 研究了砷在3种可变电荷土壤颗粒表面的吸附对土壤胶体Zeta电位的影响及砷酸根吸附过程中羟基的释放特征.在酸性条件下,土壤胶体吸附砷酸根后土壤表面的负电荷增加,Zeta电位下降.这说明砷酸根在土壤颗粒表面发生了专性吸附,吸附的砷酸根离子进入土壤胶体双电层的紧密层中.亚砷酸根吸附对土壤胶体Zeta电位的影响很小,说明它在土壤颗粒表面主要通过形成外圈型表面络合物而发生非专性吸附.砷酸根在土壤颗粒表面的吸附过程中有羟基释放,说明砷酸根与表面羟基发生了配位交换反应.羟基释放量随砷酸根加入量的增加和pH值的升高而增加.动力学实验结果表明,砷酸根吸附量和羟基释放量随时间具有相似的变化趋势,在开始的20min内,二者均随时间迅速增加,随后变化较小.羟基释放量与砷酸根吸附量的摩尔比也随时间的增加而增加,说明羟基释放反应滞后于砷酸根吸附反应.土壤体系中羟基释放量与砷酸根吸附量的摩尔比小于针铁矿体系,说明除铁铝氧化物外,土壤的其它固相组分也参与了对砷的吸附反应.
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| 关 键 词： | 砷酸根 土壤 吸附 Zeta电位 |
COORDINATION ADSORPTION OF ARSENATE ON THE PARTICLES OF VARIABLE CHARGE SOILS |
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| WANG Yong,XU Ren-kou,WANG Huo-yan,JIANG Jun.COORDINATION ADSORPTION OF ARSENATE ON THE PARTICLES OF VARIABLE CHARGE SOILS[J].Environmental Chemistry,2009,28(2). |
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| Authors: | WANG Yong XU Ren-kou WANG Huo-yan JIANG Jun |
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| Institution: | 1State Key Laboratory of Soil and Sustainable Agriculture;Institute of Soil Science;Chinese Academy of Sciences;Nanjing;210008;China;2Graduate University of Chinese Academy of Sciences;Beijing;100049;China |
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| Abstract: | The effect of arsenic adsorption on Zeta potential of colloids of the three variable charge soils and the release of OH-from the soil surface during the adsorption of arsenate were investigated.Adsorption of arsenate on the variable charge soils under acidic condition made the surface charge of the soils more negative and thus decreased the Zeta potential of these soil colloids.These data suggested that the specific adsorption of arsenate occurred on the variable charge soils and adsorbed arsenate entered t... |
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| Keywords: | arsenate soil adsorption Zeta potential |
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