Dissolved gaseous mercury formation and mercury volatilization in intertidal sediments

被引:17
作者
Cesario, Rute [1 ,2 ]
Poissant, Laurier [3 ]
Pilote, Martin [3 ]
O'Driscoll, Nelson J. [4 ]
Mota, Ana M. [1 ]
Canario, Joao [1 ]
机构
[1] Univ Lisbon, Inst Super Tecn, Ctr Quim Estrutural, Av Rovisco Pais, P-1049001 Lisbon, Portugal
[2] IPMA, Rua Alfredo Magalhaes Rantalho 6, P-1495006 Lisbon, Portugal
[3] Environm & Climate Change Canada, Aquat Contaminants Res Div, Water Sci & Technol Directorate, Montreal, PQ, Canada
[4] Acadia Univ, Dept Earth & Environm Sci, KC Irving Environm Sci Ctr, Wolfville, NS, Canada
关键词
Mercury speciation; Tidal flushing; Intertidal sediments; Tagus estuary; ST-LAWRENCE-RIVER; FRESH-WATER LAKES; ATOMIC FLUORESCENCE DETECTION; MACROTIDAL ESTUARY GIRONDE; AQUEOUS-PHASE ETHYLATION; LONG-ISLAND SOUND; ELEMENTAL MERCURY; SALT-MARSH; CHESAPEAKE BAY; TAGUS ESTUARY;
D O I
10.1016/j.scitotenv.2017.06.093
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Intertidal sediments of Tagus estuary regularly experiences complex redistribution due to tidal forcing, which affects the cycling of mercury (Hg) between sediments and the water column. This study quantifies total mercury (Hg) and methylmercury (MMHg) concentrations and fluxes in a flooded mudflat as well as the effects on waterlevel fluctuations on the air-surface exchange of mercury. A fast increase in dissolved Hg and MMHg concentrations was observed in overlying water in the first 10 min of inundation and corresponded to a decrease in pore waters, suggesting a rapid export of Hg and MMHg from sediments to the water column. Estimations of daily advective transport exceeded the predicted diffusive fluxes by 5 orders of magnitude. A fast increase in dissolved gaseous mercury (DGM) concentration was also observed in the first 20-30 min of inundation (maximum of 40 pg L-1). Suspended particulate matter (SPM) concentrations were inversely correlatedwith DGM concentrations. Dissolved Hg variation suggested that biotic DGM production in pore waters is a significant factor in addition to the photochemical reduction of Hg. Mercury volatilization (ranged from1.1 to 3.3 ngm(-2) h(-1); average of 2.1 ngm(-2) h(-1)) and DGM production exhibited the same pattern with no significant time-lag suggesting a fast release of the produced DGM. These results indicate that Hg sediment/water exchanges in the physical dominated estuaries can be underestimated when the tidal effect is not considered. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:279 / 289
页数:11
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