Pérez-Novo C, Pateiro-Moure M, Osorio F, Nóvoa-Muñoz J C, López-Periago E, Arias-Estévez M
Area de Edafoloxía a Química Agrícola, Departamento de Bioloxía Vexetal e Ciencia do Solo, Universidade de Vigo, Facultade de Ciencias, 32004 Ourense, Spain.
J Colloid Interface Sci. 2008 Jun 1;322(1):33-40. doi: 10.1016/j.jcis.2008.03.002. Epub 2008 Apr 9.
We studied competitive and noncompetitive adsorption of copper and zinc in four acid soils, and compared the behavior of the two metals in untreated samples and samples treated with hydrogen peroxide to remove organic matter in the soil. Copper exhibited stronger competitive adsorption than zinc in the untreated samples. However, removal of organic matter reduced copper adsorption to a greater extent than zinc adsorption, the two metals exhibiting a more similar adsorption pattern than the untreated samples. The presence of copper dramatically reduced zinc competitive adsorption in untreated samples; on the other hand, that of zinc only resulted in slightly reduced competitive adsorption of copper. The hydrogen peroxide treatment decreased competitive adsorption in both metals; however, copper continued to be more efficient than zinc in competing for binding sites on adsorbing surfaces. Desorption of Cu occurred much less readily than desorption of Zn and hysteresis is apparent especially for Cu.
我们研究了四种酸性土壤中铜和锌的竞争性和非竞争性吸附，并比较了这两种金属在未处理样品和用过氧化氢处理以去除土壤中有机物的样品中的行为。在未处理的样品中，铜表现出比锌更强的竞争性吸附。然而，去除有机物对铜吸附的降低程度大于对锌吸附的降低程度，与未处理的样品相比，这两种金属表现出更相似的吸附模式。在未处理的样品中，铜的存在显著降低了锌的竞争性吸附；另一方面，锌的存在仅导致铜的竞争性吸附略有降低。过氧化氢处理降低了两种金属的竞争性吸附；然而，在竞争吸附表面的结合位点方面，铜仍然比锌更有效。铜的解吸比锌的解吸要难得多，并且滞后现象明显，尤其是对于铜。
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