Dissolved mercury concentrations and reactivity in mangrove waters from the Itacurussa Experimental Forest, Sepetiba Bay, SE Brazil
作者： L.D. Lacerda , L.F.F. Silva , R.V. Marins , S. Mounier , H.H.M. Paraquetti
关键词: Sink (geography) 、 Mercury (element) 、 Experimental forest 、 Estuary 、 Mangrove 、 Oceanography 、 Bay 、 Sedimentary rock 、 Water mass 、 Geology
摘要: Mangrove waters from the Itacurussa Experimental Forest (IEF), SE Brazilare enriched in reactive-Hg (15 ± 2.0 pM) and total-Hg (28 ±2.5 relative to open bay (4.5 3.0 pM 19 ±8.5 pM, for respectively). Mercury concentrationsand reactivity varied according tidal flux mangrove creek waters.Reactive-Hg concentrations were higher ebb tide ranging 4.5to 8.5 than flood water (< 1.0 3.5 pM), whereas total-Hgconcentrations waters, 40 360 inebb (30 250 pM). Low-Hg, are Hgwhen flowing over mud flats prior entering IEF, where it mixes withpore containing extremely high Hg (up 2,500pM). Similar distributions of DOC pore suggests thatDOC may facilitate migration through sedimentary column, asshown other estuarine areas. Mud flat more likelysource total but not reactive Hg. Theseresults suggest that mangroves act as a sink Hg, has been shownfor trace metals at IEF forests. On otherhand source adjacent coastal waters.The mechanisms involved this processes have studied thispaper. However, similar distribution among thedifferent masses dynamics Hg-DOCcomplexes play dominant role.
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