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pH对黄棕壤重金属解吸特征的影响
引用本文:徐明岗,李菊梅,张青.pH对黄棕壤重金属解吸特征的影响[J].生态环境,2004,13(3):312-315.
作者姓名:徐明岗  李菊梅  张青
作者单位:中国农业科学院土壤肥料研究所,北京,100081
基金项目:国家重点基础研究发展规划项目(2002CB410809)
摘    要:对黄棕壤在pH 4~7不同吸附量下6种典型重金属(Cu2+、Zn2+、Cd2+、Pb2+、Co2+、Ni2+)的解吸进行了测定。结果表明,6种重金属的解吸量随吸附量增加而线性增大,解吸量随pH升高而增加,但解吸量占吸附量的比例随pH升高而降低。在试验条件下,黄棕壤吸附Cu2+、Zn2+、Cd2+、Pb2+、Co2+、Ni2+的平均解吸率分别为8.6%、14.3%、74.1%、9.2%、42.1%和36.9%,表明黄棕壤对6种重金属的专性吸附选择性和亲和力顺序为Cu2+、Pb2+ > Zn2+ > Co2+ > Ni2+ > Cd2+。

关 键 词:重金属  解吸  黄棕壤  酸碱度
文章编号:1672-2175(2004)03-0312-04
修稿时间:2004年2月13日

Effect of pH on desorption of heavy metals from yellow brown earth
XU Ming-gang,LI Ju-mei,ZHANG Qing Soil and Fertilizer Institute,Chinese Academy of Agricultural Sciences,Beijing ,China.Effect of pH on desorption of heavy metals from yellow brown earth[J].Ecology and Environmnet,2004,13(3):312-315.
Authors:XU Ming-gang  LI Ju-mei  ZHANG Qing Soil and Fertilizer Institute  Chinese Academy of Agricultural Sciences  Beijing  China
Institution:XU Ming-gang,LI Ju-mei,ZHANG Qing Soil and Fertilizer Institute,Chinese Academy of Agricultural Sciences,Beijing 100081,China
Abstract:Desorption of 6 heavy metals, Cu2+, Zn2+, Cd2+, Pb2+, Co2+, Ni2+ from yellow brown earth under different amount of ad-sorption of the metals at pH 4 to 7 was measured using chemical equilibrium method. The results showed that amount of desorption increased with increasing adsorption, the relationship could be described by linear equation. Although desorption of these heavy met-als increased with pH, the ratio of desorption to adsorption decreased with increasing pH. The average ratios for Cu2+, Zn2+, Cd2+, Pb2+, Co2+, Ni2+ under experimental conditions were 8.6%, 14.3%, 74.1%, 9.2%, 42.1% and 36.9%, respectively, which indicated that the specific adsorptions and the relative affinities for these six heavy metals in yellow brown earth were decreased in order as Cu2+, Pb2+ > Zn2+ > Co2+ > Ni2+ > Cd2+.
Keywords:desorption  heavy metals  pH  yellow brown earth
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