The role of natural biogeochemical barriers in limiting metal loading to a stream affected by mine drainage

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• 作者：Giovanni De Giudici^a ; ^{gbgiudic@unica.it} ; Claudia Pusceddu^a ; ^{claudia.pusceddu@unica.it} ; Daniela Medas^a ; ^{dmedas@unica.it} ; Carlo Meneghini^b ; ^{meneghini@fis.uniroma3.it} ; Alessandra Gianoncelli^c ; ^{alessandra.gianoncelli@elettra.eu} ; Valentina Rimondi^d ; ^{valentina.rimondi@unifi.it} ; Francesca Podda^a ; ^{fpodda@unica.it} ; Rosa Cidu^a ; ^{cidur@unica.it} ; Pierfranco Lattanzi^a ; ^{pierfrancolattanzi@gmail.com} ; R.B. Wanty^e ; ^{rwanty@usgs.gov} ; B.A. Kimball^f ; ^{bkim1554@gmail.com}
• 关键词：Mine wastes ; Water pollution ; Hydrologic tracer ; Hyporheic zone ; Biogeochemical barriers
• 刊名：Applied Geochemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：76
• 期：Complete
• 页码：124-135
• 全文大小：1979 K
• 卷排序：76

文摘

Metal load of Rio San Giorgio was unexpectedly low. After the inflow from Fanghi Rossi area, the apparent Zn load drops from 5.7 to 2.2 kg per day, ca. 60%. Framboidal pyrite formation limits the mobility of metals present in water and sediments in the streambed. By applying synchrotron techniques we investigated, the bioaccumulation of Zn and Fe in the roots of Phragmites australis. Hydrologic tracer work indicated a clear loss of the water-path-tracer (bromide) due to surface water entering the layered hyporheic zone.