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Comparison of potentially toxic metals leaching from weathered rocks at a closed mine site between laboratory columns and field observation

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Title: Comparison of potentially toxic metals leaching from weathered rocks at a closed mine site between laboratory columns and field observation
Authors: Villafane, Omar R. Salinas Browse this author
Igarashi, Toshifumi Browse this author →KAKEN DB
Kurosawa, Mitsuru Browse this author
Takase, Toshio Browse this author
Issue Date: Dec-2012
Publisher: Elsevier
Journal Title: Applied Geochemistry
Volume: 27
Issue: 12
Start Page: 2271
End Page: 2279
Publisher DOI: 10.1016/j.apgeochem.2012.08.013
Abstract: Potentially toxic metals, such as Cu, Pb and Zn, are leached from weathered rocks at many closed mine sites due to the acidic environments and mineralogical modifications. The mobilized toxic metals may cause contamination of surrounding water bodies. In this study, both laboratory column experiments and field observations at a former mine located in the north of Japan were carried out to compare the leaching behavior of Cu, Pb and Zn. The thickness of the surface weathered rock was varied (10, 20 and 30 cm) for the columns experiments while porous cups for porewater sampling were set up at different depths (GL-15, -45, -70, and -95 cm) for the field observations. Deionized water was added once a week over 75 weeks to the columns to simulate rainfall while porewater was extracted by a vacuum pump in several sampling campaigns (over 18 months). Similar low pH and leaching behavior of potentially toxic metals were observed for column experiments and field observations. A moderate increase in concentration with depth was observed for Cu and Zn. However, no increase in concentration was observed for Pb. This suggests that the leaching of Cu and Zn is enhanced by the length of the flow pathway through the weathered rock layer while Pb concentration is restricted by the precipitation of insoluble Pb sulfate. Thus, the thickness of the weathered rock layer is an important parameter that should be taken into consideration to estimate the loads of some potentially toxic metals, which is important when designing remediation schemes.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Omar Roberto Salinas Villafane

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