Experimental rainwater divalent mercury speciation and photoreduction rates in the presence of halides and organic carbon
作者: Xu YangMartin JiskraJeroen E. Sonke
作者单位: 1Geosciences Environnement Toulouse, Observatoire Midi-Pyrénées, CNRS/IRD/Université Toulouse III-Paul Sabatier, 31400 Toulouse, France
2Environmental Geosciences, University of Switzerland Basel, Bernoullistrasse 30, 4056 Basel, Switzerland
刊名: Science of the Total Environment, 2019, Vol.697
来源数据库: Elsevier Journal
DOI: 10.1016/j.scitotenv.2019.133821
关键词: RainwaterDivalent mercurySpeciationPhotoreduction rateHalideOrganic carbon
原始语种摘要: Abstract(#br)Mercury (Hg) photochemical redox reactions control atmospheric Hg lifetime and therefore play an important role in global Hg cycling. Oxidation of Hg(0) to Hg(II) is currently thought to be a Br-initiated two-stage reaction with end-products HgBr 2 , HgBrOH, HgBrONO, HgBrOHO. Atmospheric photoreduction of these Hg(II) compounds can take place in both the gas and aqueous phase. Here we present new experimental observations on aqueous Hg(II) photoreduction rates in the presence of dissolved organic carbon and halides and compare the findings to rainfall Hg(II) photoreduction rates. The pseudo first-order, gross photoreduction rate constant, k red , for 0.5 μM Hg(II) in the presence of 0.5 mg/ L of dissolved organic carbon (DOC) is 0.23 h −1 , which is similar to the mean k red...
全文获取路径: Elsevier  (合作)
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影响因子:3.258 (2012)

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关键词翻译
关键词翻译
  • photoreduction 光致还原
  • speciation 种别形成
  • mercury 
  • rates 地方税
  • carbon 
  • presence 存在
  • rainwater 雨水
  • organic 有机的
  • divalent 二价的