Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Lennart Hjelms väg 9, SE-756 51, Uppsala, Sweden.
Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden.
Environ Pollut. 2020 Aug;263(Pt A):114398. doi: 10.1016/j.envpol.2020.114398. Epub 2020 Mar 17.
We investigated the influence of sulfate (SO) deposition and concentrations on the net formation and solubility of methylmercury (MeHg) in peat soils. We used data from a natural sulfate deposition gradient running 300 km across southern Sweden to test the hypothesis posed by results from an experimental field study in northern Sweden: that increased loading of SO both increases net MeHg formation and redistributes methylmercury (MeHg) from the peat soil to its porewater. Sulfur concentrations in peat soils correlated positively with MeHg concentrations in peat porewater, along the deposition gradient similar to the response to added SO in the experimental field study. The combined results from the experimental field study and deposition gradient accentuate the multiple, distinct and interacting roles of SO deposition in the formation and redistribution of MeHg in the environment.
我们研究了硫酸盐（SO）沉积和浓度对泥炭土中甲基汞（MeHg）的净生成和溶解度的影响。我们利用跨越瑞典南部 300 公里的自然硫酸盐沉积梯度的数据，检验了来自瑞典北部实验性野外研究结果所提出的假设：即 SO 负荷的增加既会增加净 MeHg 的生成，又会将甲基汞（MeHg）从泥炭土重新分配到其孔隙水中。泥炭土中硫浓度与泥炭土孔隙水中 MeHg 浓度呈正相关，沿着沉积梯度与实验性野外研究中添加 SO 的反应相似。实验性野外研究和沉积梯度的综合结果强调了 SO 沉积在环境中形成和重新分配 MeHg 方面的多种、独特且相互作用的作用。
