Peng Yishu, Yang Ruidong, Jin Tao, Chen Jun, Zhang Jian
College of Tea Science, Guizhou University, Guiyang, China.
College of Resources and Environmental Engineering, Guizhou University, Guiyang, China.
PeerJ. 2021 Apr 7;9:e10825. doi: 10.7717/peerj.10825. eCollection 2021.
There are contaminated by potentially toxic metal(loid)s (PTMs) that the surface soil and the weathering profiles around the indigenous zinc smelting slag piles or smelters in the smelting area. However, few systematic studies are currently focusing on the PTM distribution and migration among the slag and its bottom weathering profile.
This research determined the concentrations of PTMs and pH values. And we analyzed PTM distribution in the two weathering profiles (slag-covered and slag-absent) with a small horizontal distance in the clastic rock region in the smelting area.
The soil As and Pb contents, respectively, within the 30 and 50 cm depth in the slag-covered section were higher than those in the slag-absent profile. All soil Cd and Zn contents of the slag-covered core were significantly higher than those in the slag-absent weathering section.
Compared with the slag-absent weathering section, some PTMs (i.e., As, Cd, Pb and Zn) in the bottom weathering profile were polluted by these elements in the covered slag in the clastic rock region, and their depths were influenced by the slag to varying degrees. Additionally, with time, some PTMs (especially Cd and Zn) of the slag might finally contaminate the groundwater by leaching and infiltration through its bottom weathering profile in the clastic rock region.
冶炼区原生锌冶炼渣堆或冶炼厂周围的表层土壤和风化剖面受到潜在有毒金属（类金属）（PTMs）的污染。然而，目前很少有系统研究关注PTMs在炉渣及其底部风化剖面中的分布和迁移情况。
本研究测定了PTMs的浓度和pH值。并分析了冶炼区碎屑岩区域水平距离较小的两种风化剖面（有炉渣覆盖和无炉渣覆盖）中PTMs的分布情况。
有炉渣覆盖剖面30厘米和50厘米深度范围内的土壤砷和铅含量分别高于无炉渣覆盖剖面。有炉渣覆盖岩芯的所有土壤镉和锌含量均显著高于无炉渣覆盖的风化剖面。
与无炉渣覆盖的风化剖面相比，碎屑岩区域有炉渣覆盖的底部风化剖面中的一些PTMs（即砷、镉、铅和锌）受到覆盖炉渣中这些元素的污染，其深度受到炉渣不同程度的影响。此外，随着时间的推移，炉渣中的一些PTMs（尤其是镉和锌）最终可能通过其底部风化剖面在碎屑岩区域的淋滤和渗透污染地下水。
