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低分子量有机酸影响可变电荷土壤吸附铜的机制 被引量:21

Mechanisms of low molecular weight organic acids affecting Cu adsorption by variable charge soils.
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摘要 采用平衡实验法研究了水杨酸和邻苯二甲酸对砖红壤吸附铜的影响,并通过吸附铜的解吸实验探讨了有机酸对铜吸附的影响机制. 结果表明,有机酸可以增加土壤对铜的吸附量,与对照相比,有机酸体系中吸附的铜的解吸量高.有机酸对铜吸附的影响随体系pH值的增加而增大,约在pH4.3(水杨酸体系)或pH4.5(邻苯二甲酸体系)达最大,然后逐渐减小.土壤对有机酸的吸附量越高,有机酸对铜吸附的影响程度越大.有机酸可以通过形成表面三元络合物和改变土壤的表面电荷2种机制影响土壤对铜的吸附.水杨酸体系中铜的解吸增量与吸附增量的百分比在76%~89%之间,说明水杨酸主要是通过增加土壤表面的净负电荷量来增加铜的静电吸附量. The influence of salicylic and phthalic acids on Cu adsorption by laterite was studied adopting equilibrium test technique, and the affecting mechanisms of organic acids on Cu adsorption were tested and explored through the desorption of adsorbed Cu. Organic acids could increase the Cu adsorption amount of soil and the desorption amount of Cu adsorbed in organic acids system was higher than that in control system. The influence of organic acid on Cu adsorption increased with the increase of pH value in the system and reached the maximum about pH 4.3 (salicylic acid system) and 4.5 (phthalic acid system); and then decreased gradually. The higher the amount of organic acids adsorbed, the larger the influence degree of the Cu adsorption by organic acids. Organic acids could influence Cu adsorption by soil through two mechanisms: the formation of soil-organic acid-cation surface ternary complex compound and the change of surface charge of soil. In salicylic acid system, the percentage of the increment in the Cu desorption to that in the Cu adsorption was in the range of 76% to 89%, showing that salicylic acid increase electrostatic adsorption amount of Cu mainly through the increase of net negative charge amount of soil surface.
出处 《中国环境科学》 EI CAS CSCD 北大核心 2005年第3期334-338,共5页 China Environmental Science
基金 国家自然科学基金资助项目(40271062) 中国科学院知识创新工程领域前沿项目(ISSASIP0202)
关键词 可变电荷土壤 有机酸 铜吸附 解吸 variable charge soil organic acid Cu adsorption desorption
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参考文献11

  • 1Naidu R, Kookana R S, Sumner M E, et al. Cadmium sorption and transport in variable charge soils: a review [J]. J. Environ. Qual., 1997,26(3):602-617.
  • 2Fox T R, Comerford N B. Low-molecular-weight organic acids in selected forest soils of the south eastern USA [J]. Soil Sci. Soc. Am. J., 1990,54(4):1139-1144.
  • 3Jones D L. Organic acids in the rhizosphere -a critical review [J]. Plant and Soil, 1998,205(1):25-44.
  • 4Strobel B W. Influence of vegetation on low-molecular-weight carboxylic acids in soil solution-a review [J]. Geoderma, 2001, 99(3-4):169-198.
  • 5Harter R D, Naidu R. Role of metal-organic complexation in metal sorption by soils [J]. Adv. Agron., 1995,55:219-263.
  • 6Naidu R, Harter R D. Effect of different organic ligands on cadmium sorption by and extractability from soils [J]. Soil Sci. Soc. Am. J., 1997,62(2):644-650.
  • 7Ali M A, Dzombak D A. Effects of simple organic acids on sorption of Cu^2+ and Ca^2+ on goethite [J]. Geochim. Cosmochim. Acta., 1996,60(2):291-304.
  • 8徐仁扣,肖双成,李九玉.低分子量有机酸对两种可变电荷土壤吸附铜的影响[J].农业环境科学学报,2004,23(2):304-307. 被引量:19
  • 9McBride M B. Influence of glycine on Cu^2+ adsorption by microcrystalline gibbsite and boehmite [J]. Clays Clay Minerals, 1985,33(5):397-402.
  • 10Rudin M, Motschi H. A molecular model for the structure of Cu complexes on hydrous oxides surfaces: An ENDOR study of ternary Cu(Ⅱ) complex on δ-alumina [J]. J. Colloid Interface Sci., 1984,98(2):385-393.

二级参考文献15

  • 1熊毅 李庆逵.中国土壤[M].北京:科学出版社,1990..
  • 2Xu RK, Zhao AZ and Ji GL. Effect of low - molecular - weight organic anions on surface charge of variable charge soils [J ]. J Colloid Interface Sci, 2003, 264:322 - 326.
  • 3Ali MA and Dzombak DA. Effect of simple organic acids on sorption of Cu2^+ and Ca^2+ on geothite[J]. Geochim Cosmochim Acta, 1996, 60:291 - 304.
  • 4Naidu R, Kookana RS, Sumner ME, Harter RD and Tiller KG. Cadmium sorption and transport in variable charge soils: a review[J]. J Environ Qual, 1997, 26:602 - 617.
  • 5Strobel BW. Influence of vegetation on low - molecular - weight carboxylic acids in soil solution - a review[J]. Geoderma, 2001, 99:169 -198.
  • 6Nuidu R and Harter RD. Effect of different organic ligands on cadmium sorption by and extractability from soils[J]. Soil Sci Soc Am J, 1997,62:644 - 650.
  • 7Harter RD and Naidu R. Role of metal - organic complexation in metal sorption by soils[J]. Adv Agron, 1995, 55:219 - 264.
  • 8Naidu R, Kookana R S, Sumner M E, Harter R D and Tiller KG. Cadmium sorption and transport in variable charge soils: a review[J]. J Environ Qual, 1997, 26:602 -617.
  • 9Strobel B W. Influence of vegetation on low - molecular - weight carboxylic acids in soil solution- a review[J]. Geoderma, 2001, 99:169 - 198.
  • 10Nuidu R and Harter R D. Effect of different organic ligands on cadmium sorption by and extractability from soils[J]. Soil Sci Soc Am J, 1997,62:644 - 650.

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