Dynamics of mercury fluxes and their controlling factors in large Hg-polluted floodplain areas.
Dynamics of mercury fluxes and their controlling factors in large Hg-polluted floodplain areas.
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DOI：
10.1016/j.envpol.2009.07.001
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发表时间：
2010
影响因子：
8.9
通讯作者：
J. Rinklebe;A. During;M. Overesch;G. Du Laing;R. Wennrich;H. Stärk;S. Mothes
中科院分区：
文献类型：
--
作者：
J. Rinklebe;A. During;M. Overesch;G. Du Laing;R. Wennrich;H. Stärk;S. Mothes
汞污染是一个世界性的环境问题。由于土壤中的汞挥发，洪泛区可能成为挥发性汞的重要来源。土壤温度和土壤含水量与洪水动力学有关，被认为是影响总气态汞（TGM）通量季节动态的重要因素。我们量化了TGM通量的季节变化，并进行了一个实验室微观实验，以评估温度和湿度对TGM通量在严重污染的洪泛区土壤的影响。观测到的TGM排放量从10到850 ng m− 2 h − 1不等，远远超过了非污染场地的排放量。在田间（R2：0.49-0.70）和实验室（R2：0.99）实验中，TGM排放量随着空气和土壤温度的升高呈指数增加。湿土壤材料表现出较高的TGM通量，而土壤含水量的作用受到采样时间在微观实验。
Environmental pollution by mercury (Hg) is a considerable environmental problem world-wide. Due to the occurrence of Hg volatilization from their soils, floodplains can function as an important source of volatile Hg. Soil temperature and soil water content related to flood dynamics are considered as important factors affecting seasonal dynamics of total gaseous mercury (TGM) fluxes. We quantified seasonal variations of TGM fluxes and conducted a laboratory microcosm experiment to assess the effect of temperature and moisture on TGM fluxes in heavily polluted floodplain soils. Observed TGM emissions ranged from 10 to 850 ng m−2h−1and extremely exceeded the emissions of non-polluted sites. TGM emissions increased exponentially with raised air and soil temperatures in both field (R2: 0.49–0.70) and laboratory (R2: 0.99) experiments. Wet soil material showed higher TGM fluxes, whereas the role of soil water content was affected by sampling time during the microcosm experiments.