Nartowska Edyta
Dep. of Geotechnical and Water Engineering, Kielce Univ. of Technology, Al. Tysiąclecia P.P. 7, 25-314, Kielce, Poland.
Heliyon. 2019 Oct 4;5(10):e02563. doi: 10.1016/j.heliyon.2019.e02563. eCollection 2019 Oct.
The purpose of this study was to determine the effect of copper or zinc ions, absorbed by soil on its physical and physicochemical properties. The change in these properties may reduce the soil usefulness as a mineral protective barrier, for example, on hazardous waste landfills. Parameters such as granulometric composition, effective particle size d, empirical hydraulic conductivity, Atterberg limits, colloidal activity, specific surface area, sorption moisture content, and montmorillonite content were determined. The tests were carried out on model Na or Ca samples of American bentonites (SWy-3, Stx-1b) and Slovak bentonite from Jelšový potok (BSvk), subjected to ion exchange for Cu or Zn ion. The content of elements was determined using inductively coupled plasma optical emission spectrometry (ICP-OES). Regression analysis showed a significant effect of Zn ions on the reduction of sorption moisture content w and the increase in the hydraulic conductivity. Nearly complete negative correlation was obtained between the Cu ion content and the specific surface area, sorption moisture content w, and montmorillonite content (R = -0.99). It was observed that the significance of the influence of Cu and Zn ions on specific clay properties differed, which indicates different behavior of these metals in the clay-water system. The different nature of clays contaminated with Cu and Zn ions justifies the need to continue research on other potentially toxic metals and to further search for prediction equations of the cohesive soil hydraulic conductivity based on soil parameters that are most frequently modified as a result of their impact.
本研究的目的是确定被土壤吸收的铜或锌离子对其物理和物理化学性质的影响。这些性质的变化可能会降低土壤作为矿物保护屏障的效用，例如在危险废物填埋场上。测定了颗粒组成、有效粒径d、经验渗透系数、阿太堡界限、胶体活性、比表面积、吸附含水量和蒙脱石含量等参数。试验是在美国膨润土（SWy - 3、Stx - 1b）的模型钠或钙样品以及来自耶尔绍夫溪的斯洛伐克膨润土（BSvk）上进行的，这些样品经过铜或锌离子的离子交换。使用电感耦合等离子体发射光谱法（ICP - OES）测定元素含量。回归分析表明，锌离子对吸附含水量w的降低和渗透系数的增加有显著影响。铜离子含量与比表面积、吸附含水量w和蒙脱石含量之间几乎呈完全负相关（R = -0.99）。观察到铜和锌离子对特定粘土性质的影响的显著性不同，这表明这些金属在粘土 - 水体系中的行为不同。被铜和锌离子污染的粘土的不同性质证明有必要继续研究其他潜在有毒金属，并进一步寻找基于因它们的影响而最常改变的土壤参数的粘性土渗透系数预测方程。
