Copper Stable Isotopes To Trace Copper Behavior in Wetland Systems

详细信息    查看全文

• 作者：Izabella Babcs谩nyi ; Gwena毛l Imfeld ; Mathieu Granet ; Fran莽ois Chabaux
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：May 20, 2014
• 年：2014
• 卷：48
• 期：10
• 页码：5520-5529
• 全文大小：470K
• 年卷期：v.48,no.10(May 20, 2014)
• ISSN：1520-5851

文摘

Wetlands are reactive zones of the landscape that can sequester metals released by industrial and agricultural activities. Copper (Cu) stable isotope ratios (未⁶⁵Cu) have recently been used as tracers of transport and transformation processes in polluted environments. Here, we used Cu stable isotopes to trace the behavior of Cu in a stormwater wetland receiving runoff from a vineyard catchment (Alsace, France). The Cu loads and stable isotope ratios were determined in the dissolved phase, suspended particulate matter (SPM), wetland sediments, and vegetation. The wetland retained >68% of the dissolved Cu and >92% of the SPM-bound Cu, which represented 84.4% of the total Cu in the runoff. The dissolved Cu became depleted in ⁶⁵Cu when passing through the wetland (螖⁶⁵Cu_{inlet鈥搊utlet} from 0.03鈥?to 0.77鈥?, which reflects Cu adsorption to aluminum minerals and organic matter. The 未⁶⁵Cu values varied little in the wetland sediments (0.04 卤 0.10鈥?, which stored >96% of the total Cu mass within the wetland. During high-flow conditions, the Cu flowing out of the wetland became isotopically lighter, indicating the mobilization of reduced Cu(I) species from the sediments and Cu reduction within the sediments. Our results demonstrate that the Cu stable isotope ratios may help trace Cu behavior in redox-dynamic environments such as wetlands.