Copper Speciation in Soil: Time Evolution and Effect of Clay Amendment

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• 作者：Andrea C. Montenegro ; Gisele V. Ferreyroa ; María E. Parolo…
• 关键词：Sequential Selective Extraction ; Availability ; Bentonite ; Heavy Metals ; Soil Pollution
• 刊名：Water, Air, and Soil Pollution
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：226
• 期：9
• 全文大小：1,852 KB
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• 作者单位：Andrea C. Montenegro (1) (2)
  Gisele V. Ferreyroa (1)
  María E. Parolo (3)
  Mabel B. Tudino (1)
  Raúl S. Lavado (2)
  Fernando V. Molina (1)
  
  1. Instituto de Química Física de Materiales, Ambiente y Energía (INQUIMAE), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, piso 1, C1428EHA, Buenos Aires, Argentina
  2. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA), Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina
  3. Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas, PROBIEN (CONICET-UNCo) y Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén, 8300, Argentina
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Terrestrial Pollution
  Hydrogeology
  
• 出版者：Springer Netherlands
• ISSN：1573-2932

文摘

Copper bioavailability, specially to plants, is strongly dependent on its chemical form, as for most metals. Copper-contaminated soil can be treated in situ by the addition of minerals such as Na-bentonite, which mixed with surface soil, can transform this pollutant to non-bioavailable forms. In this work, shelter experiments were conducted to study the time evolution of Cu speciation, in pristine soil as well as in amended one. A selective sequential extraction method was employed to determine the metal speciation in the samples. The results show that the major metal fraction is the organic matter-bound one, whereas the exchangeable fraction is very low, even the first day after Cu addition. The time evolution shows a slow decrease of the organic-bound Cu and a corresponding increase of the most stable mineral fractions. With the addition of Na-bentonite to copper-contaminated soil, the most stable mineral fractions increase whereas the organic-bound one decreases, showing essentially similar time dependence of the several metal fractions. Sodium bentonite could be effectively used for remediation of soils polluted with Cu.