| 恒电荷土壤及可变电荷土壤与离子间相互作用的研究Ⅲ Cu2+和Zn2+的吸附特征 |
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| 引用本文： | 徐明岗,季国亮.恒电荷土壤及可变电荷土壤与离子间相互作用的研究Ⅲ Cu2+和Zn2+的吸附特征[J].土壤学报,2005,42(2):225-231. |
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| 作者姓名： | 徐明岗 季国亮 |
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| 作者单位： | 1. 中国农科院土壤肥料研究所工作
2. 中国科学院南京土壤研究所,南京,210008 |
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| 基金项目： | 国家自然科学基金项目(49831005)和国家重点基础研究发展规划项目(973课题2002CB410809)资助 |
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| 摘 要： | 研究了3种典型可变电荷土壤和4种典型恒电荷土壤在不同pH和不同浓度下单纯及共存体系中Cu2 和Zn2 的吸附及其影响因素。结果表明,两类土壤对Cu2 或Zn2 的吸附量均随平衡浓度增加而增大,符合Langmuir吸附等温式;当Cu2 、Zn2 浓度一定时,pH升高使Cu2 、Zn2 吸附量增大,但当pH >5时,Cu2 、Zn2 吸附量随pH变化甚微,出现一个接近最大吸附量的“平台”。当添加Cu2 、Zn2 浓度相同,但二种离子的总浓度不同时,平衡液的Cu2 /Zn2 浓度比均小于1,说明两类土壤对Cu2 的吸附选择性大于Zn2 ,且这种趋势不因pH和离子浓度而改变。当Cu2 、Zn2 共存时,使可变电荷土壤的Zn2 吸附量减小约70 % ,是恒电荷土壤降低量的约1.5倍;可变电荷土壤吸附一个Cu2 或Zn2 时所释放H 的平均数,明显大于恒电荷土壤者,说明可变电荷土壤对Cu2 及Zn2 的吸附中专性吸附的比例较恒电荷土壤大
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| 关 键 词： | Cu2 吸附 Zn2 吸附 恒电荷土壤 可变电荷土壤 |
| 收稿时间： | 2004/5/24 0:00:00 |
| 修稿时间： | 2004/7/16 0:00:00 |
INTERACTION OF IONS WITH CONSTANT CHARGE SOILS AND VARIABLE CHARGE SOILS Ⅲ. CHARACTERISTICS OF Cu2 + AND Zn2+ ADSORPTION IN SINGLE AND CO-EXISTING SYSTEMS |
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| Xu Minggang and Ji Guoliang.INTERACTION OF IONS WITH CONSTANT CHARGE SOILS AND VARIABLE CHARGE SOILS Ⅲ. CHARACTERISTICS OF Cu2 + AND Zn2+ ADSORPTION IN SINGLE AND CO-EXISTING SYSTEMS[J].Acta Pedologica Sinica,2005,42(2):225-231. |
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| Authors: | Xu Minggang and Ji Guoliang |
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| Institution: | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
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| Abstract: | Adsorptions of Cu 2 and Zn 2 by three typical variable charge soils and four typical constant charge soils different in pH and in accompanying ion, Na , Zn 2 or Cu 2 were determined, respectively. The results showed that adsorption of Cu 2 and Zn 2 by the soils could be described by the Langmiur equation C/(X m)=1/Kb C/b both in the single ion and co existing ions systems. The adsorption of Cu 2 or Zn 2 increased with pH and reached a plateau value when the pH value was 5. The affinity in adsorption of Cu 2 was greater than that of Zn 2 . The mechanism of adsorption Cu 2 and Zn 2 was closely related to chemical composition and surface properties of the soils. The relative contribution of specific adsorption to the adsorption of Cu 2 and Zn 2 by the variable charge soils was greater than that by the constant charge soils. |
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| Keywords: | Adsorption Cu 2 Zn 2 Constant charge soils Variable charge soils |
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