Vega Flora A, Covelo Emma F, Vázquez Juan J, Andrade Luisa
Department of Plant Biology and Soil Sciences, Faculty of Biology, University of Vigo, Vigo, Spain.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2007 Dec;42(14):2167-73. doi: 10.1080/10934520701629682.
Sorption isotherms were constructed for the sorption of Cu, Pb and Zn by the surface horizons of three soils [a Humic Cambisol (G1), a Haplic Podzol (G2) and an Umbric Gleysol (G3)] and by fractions obtained by sequential removal of organic matter and oxides. All were of L-type except the H-type isotherms recorded for sorption of lead by whole G2, and all were fitted well by the Langmuir model, with determination coefficients > 0.91. Langmuir equation parameter beta correlated well (r(2) = 0.985) with experimentally maximum sorption capacity. For all soils, metal sorption capacities decreased in the order Zn > Cu > Pb. Sorption by organic matter was one of the main contributions to total sorption. Sorption by oxides was generally most substantial in G1, which had the largest total oxides content, while the sorption of lead by G3 was attributable to its high Mn oxides content. The clayey residue contributed significantly to sorption of zinc by G1, and G3 (due to their respective vermiculite and gibbsite contents) and to sorption of copper by G1 due to its vermiculite content.
构建了三种土壤[一种腐殖质始成土（G1）、一种灰化淋溶土（G2）和一种暗沃潜育土（G3）]的表层以及通过顺序去除有机质和氧化物获得的组分对铜、铅和锌的吸附等温线。除了全G2对铅的吸附记录为H型等温线外，其余均为L型等温线，并且所有等温线都能很好地用朗缪尔模型拟合，决定系数>0.91。朗缪尔方程参数β与实验最大吸附容量相关性良好（r² = 0.985）。对于所有土壤，金属吸附容量按锌>铜>铅的顺序降低。有机质的吸附是总吸附的主要贡献之一。氧化物的吸附在总氧化物含量最高的G1中通常最为显著，而G3对铅的吸附归因于其高氧化锰含量。黏粒残渣对G1和G3对锌的吸附（分别由于它们各自的蛭石和三水铝石含量）以及G1对铜的吸附（由于其蛭石含量）有显著贡献。
