Comparison of potentially toxic metals leaching from weathered rocks at a closed mine site between laboratory columns and field observation
► Copper, Pb, and Zn leaching from weathered rocks from a former mine were compared. ► Potentially toxic metals leaching from columns and field observations were similar. ► The pH was acidic and did not fluctuate significantly over the experiments. ► Copper and Zn concentrations increased with depth...
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Veröffentlicht in: | Applied geochemistry 2012-12, Vol.27 (12), p.2271-2279 |
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description | ► Copper, Pb, and Zn leaching from weathered rocks from a former mine were compared. ► Potentially toxic metals leaching from columns and field observations were similar. ► The pH was acidic and did not fluctuate significantly over the experiments. ► Copper and Zn concentrations increased with depth. ► Lead concentrations remained unchanged since Pb-Sulfate restricted its solubility.
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 30cm) for the columns experiments while porous cups for porewater sampling were set up at different depths (GL-15, -45, -70, and -95cm) for the field observations. Deionized water was added once a week over 75weeks to the columns to simulate rainfall while porewater was extracted by a vacuum pump in several sampling campaigns (over 18months). 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. |
doi_str_mv | 10.1016/j.apgeochem.2012.08.013 |
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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 30cm) for the columns experiments while porous cups for porewater sampling were set up at different depths (GL-15, -45, -70, and -95cm) for the field observations. Deionized water was added once a week over 75weeks to the columns to simulate rainfall while porewater was extracted by a vacuum pump in several sampling campaigns (over 18months). 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.</description><identifier>ISSN: 0883-2927</identifier><identifier>EISSN: 1872-9134</identifier><identifier>DOI: 10.1016/j.apgeochem.2012.08.013</identifier><identifier>CODEN: APPGEY</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Copper ; Earth sciences ; Earth, ocean, space ; Engineering and environment geology. Geothermics ; Exact sciences and technology ; field experimentation ; Geochemistry ; Leaching ; lead ; Lead (metal) ; Mines ; Pollution, environment geology ; rain ; remediation ; Rocks ; surface water ; Toxic ; toxicity ; Toxicology ; Zinc</subject><ispartof>Applied geochemistry, 2012-12, Vol.27 (12), p.2271-2279</ispartof><rights>2012 Elsevier Ltd</rights><rights>2014 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a535t-3936750f213bac68f9bce8c366bdfd539d68d91a19af68aeca7beccc460b73c33</citedby><cites>FETCH-LOGICAL-a535t-3936750f213bac68f9bce8c366bdfd539d68d91a19af68aeca7beccc460b73c33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0883292712002284$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65534</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26651111$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Salinas Villafane, Omar R.</creatorcontrib><creatorcontrib>Igarashi, Toshifumi</creatorcontrib><creatorcontrib>Kurosawa, Mitsuru</creatorcontrib><creatorcontrib>Takase, Toshio</creatorcontrib><title>Comparison of potentially toxic metals leaching from weathered rocks at a closed mine site between laboratory columns and field observation</title><title>Applied geochemistry</title><description>► Copper, Pb, and Zn leaching from weathered rocks from a former mine were compared. ► Potentially toxic metals leaching from columns and field observations were similar. ► The pH was acidic and did not fluctuate significantly over the experiments. ► Copper and Zn concentrations increased with depth. ► Lead concentrations remained unchanged since Pb-Sulfate restricted its solubility.
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 30cm) for the columns experiments while porous cups for porewater sampling were set up at different depths (GL-15, -45, -70, and -95cm) for the field observations. Deionized water was added once a week over 75weeks to the columns to simulate rainfall while porewater was extracted by a vacuum pump in several sampling campaigns (over 18months). 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.</description><subject>Copper</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. Geothermics</subject><subject>Exact sciences and technology</subject><subject>field experimentation</subject><subject>Geochemistry</subject><subject>Leaching</subject><subject>lead</subject><subject>Lead (metal)</subject><subject>Mines</subject><subject>Pollution, environment geology</subject><subject>rain</subject><subject>remediation</subject><subject>Rocks</subject><subject>surface water</subject><subject>Toxic</subject><subject>toxicity</subject><subject>Toxicology</subject><subject>Zinc</subject><issn>0883-2927</issn><issn>1872-9134</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqFkctuFDEQRVsIJIbAN8QbJDbd-DH9WkYjXlIkFpC1VV1dnvHgthvbkzDfwE_jaKJsqY2l0rlVpeOquha8EVx0H48NrHsKeKClkVzIhg8NF-pFtRFDL-tRqO3LasOHQdVylP3r6k1KR85523O5qf7uwrJCtCl4FgxbQyafLTh3Zjn8scgWyuAScwR4sH7PTAwLeyDIB4o0sxjwV2KQGTB0IZXOYj2xZDOxifIDkWcOphAhh3hmGNxp8SXgZ2YsuZmFKVG8h2yDf1u9MmUXvXt6r6q7z59-7r7Wt9-_fNvd3NbQqjbXalRd33IjhZoAu8GME9KAquum2cytGudumEcBYgTTDUAI_USIuO341CtU6qr6cJm7xvD7RCnrxSYk58BTOCUtZC970cp2LGh_QTGGlCIZvUa7QDxrwfWjfn3Uz_r1o37NB130l-T7pyWQEJyJ4NGm57jsulaUKtz1hTMQNOzLT-i7H2VQy7nkUshtIW4uBBUn95aiTmjJI802EmY9B_vfa_4BRi6srA</recordid><startdate>20121201</startdate><enddate>20121201</enddate><creator>Salinas Villafane, Omar R.</creator><creator>Igarashi, Toshifumi</creator><creator>Kurosawa, Mitsuru</creator><creator>Takase, Toshio</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>FBQ</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20121201</creationdate><title>Comparison of potentially toxic metals leaching from weathered rocks at a closed mine site between laboratory columns and field observation</title><author>Salinas Villafane, Omar R. ; Igarashi, Toshifumi ; Kurosawa, Mitsuru ; Takase, Toshio</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a535t-3936750f213bac68f9bce8c366bdfd539d68d91a19af68aeca7beccc460b73c33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Copper</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Engineering and environment geology. Geothermics</topic><topic>Exact sciences and technology</topic><topic>field experimentation</topic><topic>Geochemistry</topic><topic>Leaching</topic><topic>lead</topic><topic>Lead (metal)</topic><topic>Mines</topic><topic>Pollution, environment geology</topic><topic>rain</topic><topic>remediation</topic><topic>Rocks</topic><topic>surface water</topic><topic>Toxic</topic><topic>toxicity</topic><topic>Toxicology</topic><topic>Zinc</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Salinas Villafane, Omar R.</creatorcontrib><creatorcontrib>Igarashi, Toshifumi</creatorcontrib><creatorcontrib>Kurosawa, Mitsuru</creatorcontrib><creatorcontrib>Takase, Toshio</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Applied geochemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Salinas Villafane, Omar R.</au><au>Igarashi, Toshifumi</au><au>Kurosawa, Mitsuru</au><au>Takase, Toshio</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Comparison of potentially toxic metals leaching from weathered rocks at a closed mine site between laboratory columns and field observation</atitle><jtitle>Applied geochemistry</jtitle><date>2012-12-01</date><risdate>2012</risdate><volume>27</volume><issue>12</issue><spage>2271</spage><epage>2279</epage><pages>2271-2279</pages><issn>0883-2927</issn><eissn>1872-9134</eissn><coden>APPGEY</coden><abstract>► Copper, Pb, and Zn leaching from weathered rocks from a former mine were compared. ► Potentially toxic metals leaching from columns and field observations were similar. ► The pH was acidic and did not fluctuate significantly over the experiments. ► Copper and Zn concentrations increased with depth. ► Lead concentrations remained unchanged since Pb-Sulfate restricted its solubility.
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 30cm) for the columns experiments while porous cups for porewater sampling were set up at different depths (GL-15, -45, -70, and -95cm) for the field observations. Deionized water was added once a week over 75weeks to the columns to simulate rainfall while porewater was extracted by a vacuum pump in several sampling campaigns (over 18months). 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.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.apgeochem.2012.08.013</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Copper Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology field experimentation Geochemistry Leaching lead Lead (metal) Mines Pollution, environment geology rain remediation Rocks surface water Toxic toxicity Toxicology Zinc |
title | Comparison of potentially toxic metals leaching from weathered rocks at a closed mine site between laboratory columns and field observation |
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