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当前位置: 首页 > 文章 > 共存阳离子对土壤吸附Cu~(2+)的影响特征 农业环境科学学报 2004,23 (05) 104-107
Position: Home > Articles > Adsorption of Cu~(2+) by Soils Under Different Co-existing Cations Journal of Agro-Environment Science 2004,23 (05) 104-107

共存阳离子对土壤吸附Cu~(2+)的影响特征

作  者：
徐明岗;李菊梅;陈世宝
单  位：
中国农业科学院土壤肥料研究所
关键词：
Cu2+;共存离子;砖红壤;黄棕壤;吸附等温线
摘  要：
采用室内试验方法,研究了我国4种典型土壤——砖红壤、赤红壤、黄棕壤和暗棕壤在伴随阳离子分别为Na+、Ca2+、Zn2+时对Cu2+的吸附。结果表明,无论是单溶质或复合离子体系下,土壤对Cu2+的吸附等温线都可用Langmuir方程很好地拟合;Cu2+的吸附结合能(K)在Na+体系下为砖红壤>赤红壤>黄棕壤>暗棕壤,说明4种土壤对Cu2+吸附的亲和力依次减弱,但Ca2+共存时使土壤对Cu2+的吸附结合能明显增大,说明Ca2+可使土壤对Cu2+专性吸附增强;Na+共存时不影响土壤对Cu2+的吸附,而Ca2+、Zn2+共存时可使土壤对Cu2+的最大吸附量(Xm)平均分别降低14.5%和33.6%,且降低的程度为暗棕壤和黄棕壤>赤红壤>砖红壤,Cu2+、Zn2+、Ca2+之间存在明显的竞争吸附。
译  名：
Adsorption of Cu~(2+) by Soils Under Different Co-existing Cations
作  者：
XU Ming-gang,LI Jü-mei,CHEN Shi-bao(Soil and Fertilizer Institute,Chinese Academy of Agricultural Sciences,Bei jing 100081,China)
关键词：
Cu2+;co-existing cation;latersol;yellow brown earth;ads orption isotherm
摘  要：
The adsorption of Cu2+by four typical soils--latersol, red l atersol, yellow brown earth and dark brown earth of China were measured under si ngle and coexisting Na+,Ca2+or Zn2+conditions, respectively. The results s howed that adsorption of Cu2+by these soils could be described by the Langmiu r equation C/X = 1/(Xm·K) +C/Xm both in single and co-existing cation sys tems. The affinity characteristics (K) of four soils in Na+system decreased i n an order: latersol>red latersol>yellow brown earth and dark brown earth. Coexi sting Na+had no significant effect on the adsorption of Cu2+by soils, while Ca2+or Zn2+caused the adsorption of Cu2+decreasing significantly. Compared with Cu2+single system, the maximums adsorption of Cu2+(Xm) reduced by 11. 5%and 33.6%on average under coexisting Ca2+and Zn2+, respectively. The adsorption of Cu2+was mainly controlled by specific adsorption, and there was highly competitive adsorption between Cu2+and Zn2+.

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