Mechanism and significance of mercury volatilization from contaminated floodplains of the German river Elbe
Mechanism and significance of mercury volatilization from contaminated floodplains of the German river Elbe
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DOI：
10.1016/s1352-2310(00)00083-2
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发表时间：
2000
影响因子：
5
通讯作者：
D. Wallschläger;H. Kock;W. Schroeder;S. Lindberg;R. Ebinghaus;R. Wilken
中科院分区：
文献类型：
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作者：
D. Wallschläger;H. Kock;W. Schroeder;S. Lindberg;R. Ebinghaus;R. Wilken
在易北河（德国北部）沿岸的洪泛区研究了受污染湿地汞向大气排放的几个方面。挥发过程表现为土壤/空气界面（空气和土壤空气）周围边界层中大气汞浓度的良好高度分布。该剖面由详细的 9 点垂直梯度描述，遵循地面上方的数学描述 c (Hg)=27h−0.5。这种幂函数关系在理论上进行了讨论，并通过与文献中描述的其他大气汞高度剖面进行比较进行了验证。由于土壤湿度增加，降雨事件使进入大气的汞通量增加了三倍，这加深了对相转移机制的理解。提出了一种机制，该机制表明了土壤中汞的水生和大气再利用之间的耦合，从而强调了湿地由于其特性而在生物地球化学循环中的汞周转中发挥着重要作用。最后，对排放的长期行为及其对区域汞预算的重要性进行了一些估计。
Several aspects of atmospheric emissions of mercury from contaminated wetlands were studied in the floodplains along the river Elbe (Northern Germany). The volatilization process manifests itself in a well behaved height profile of atmospheric mercury concentrations in the boundary layer around the soil/air interface (air and soil air). This profile was described by a detailed 9-point vertical gradient, which follows the mathematical description c (Hg)=27h−0.5above the ground. This power function relationship is discussed theoretically and validated by comparison to other atmospheric mercury height profiles described in the literature. Understanding of the phase transfer mechanism is improved by the finding that rain events increase the mercury flux to the atmosphere up to threefold due to increased soil moisture. A mechanism is proposed, which indicates the coupling between aquatic and atmospheric remobilization of mercury from soils, and thereby emphasizes that wetlands play an important role for mercury turnover in biogeochemical cycles due to their characteristic properties. Finally, some estimates of the long-term behavior of the emissions and their importance for the regional Hg budget are derived.