Area de Edafoloxía e Química Agrícola, Departamento de Bioloxía Vexetal e Ciencia do Solo, Univ. Vigo, Facultade de Ciencias, 32004 Ourense, Spain.
Area de Edafoloxía e Química Agrícola, Departamento de Bioloxía Vexetal e Ciencia do Solo, Univ. Vigo, Facultade de Ciencias, 32004 Ourense, Spain.
Chemosphere. 2014 Jul;107:379-385. doi: 10.1016/j.chemosphere.2013.12.097. Epub 2014 Jan 25.
Batch type and column experiments were used to study competitive adsorption-desorption and transport for Cd, Cu, Ni and Zn in a mine soil, both un-amended and amended with mussel shell. Batch type experiments showed that adsorption was affected by the added concentration of the metals, generally following the sequence Cu>Zn>Cd≈Ni. Metal desorbed was a function of the dose of metal added, as well as of the dose of shell amendment, being relevant that even when the highest dose of metal (2300 μM) was added, the 24 g kg(-1) shell amendment caused a drastic diminution in the amount of metal desorbed. Column experiments showed that even the lowest dose of the shell amendment (6 g kg(-1)) caused a strong retention of the 4 heavy metals assayed, whereas using the 24 g kg(-1) shell amendment no metal was detected in the effluent during the time of the experiment. The mass of metal retained in the un-amended soil was very different for the various metals assayed, but the amendment with 6 g kg(-1) shell increased this retention in all cases, and the 24 g kg(-1) amendment caused almost 100% retention for all 4 metals. The retardation factor (R) suffered an overall increase as a function of the shell dose; the profile distribution of the 4 heavy metals was homogeneous through the un-amended soil into the column, but the shell amendment clearly decreased the solute transport affecting these metals, causing its concentration in the first centimeters of the soil profile.
批次实验和柱实验用于研究在未经修饰和用贻贝壳修饰的矿区土壤中，Cd、Cu、Ni 和 Zn 的竞争吸附-解吸和迁移。批次实验表明，吸附受添加金属浓度的影响，一般遵循 Cu>Zn>Cd≈Ni 的顺序。金属解吸是添加金属剂量和贝壳添加剂量的函数，值得注意的是，即使添加了最高剂量的金属（2300 μM），24 g kg(-1)的贝壳添加剂量也会导致金属解吸量急剧减少。柱实验表明，即使添加了最低剂量的贝壳添加剂量（6 g kg(-1))，也会强烈保留所测定的 4 种重金属，而在实验期间，使用 24 g kg(-1)的贝壳添加剂量，在流出物中未检测到任何金属。未经修饰的土壤中保留的金属量因测定的各种金属而异，但添加 6 g kg(-1)的贝壳会增加所有情况下的这种保留，而添加 24 g kg(-1)的贝壳会导致所有 4 种金属几乎 100%保留。阻滞因子（R）随着贝壳剂量的增加而整体增加；4 种重金属在未修饰土壤中的分布在整个柱体中是均匀的，但贝壳添加剂明显降低了影响这些金属的溶质迁移，导致其在土壤剖面的前几厘米中浓度降低。
