Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要:
To assess the role of salt-marsh plants on the vegetation-atmospheric Hg0fluxes, three salt marsh plant species, Halimione portulacoides, Sarcocornia fruticosa and Spartina maritima were selected from a moderately contaminated site in the Tagus estuary during May 2012. Total mercury in stems and leaves for each plant as well as total gaseous mercury and vegetation-air Hg0fluxes were measured over two continuous days. Mercury fluxes were estimated with a dynamic flux Tedlar�bag coupled to a high-resolution automated mercury analyzer (Tekran 2537A). Other environmental parameters such as air temperature, relative humidity and net solar radiation were also measured aside. H.�portulacoides showed the highest total mercury concentrations in stems and leaves and the highest average vegetation-air Hg0flux (0.48���0.40�ng Hg m−2h−1). The continuous measurements converged to a daily pattern for all plants, with enhanced fluxes during daylight and lower flux during the night. It is noteworthy that throughout the measurements a negative flux (air-vegetation) was never observed, suggesting the absence of net Hg0deposition. Based on the above fluxes and the total area occupied by each species we have estimated the total amount of Hg0emitted from this salt-marsh plants. A daily emission of 1.19�mg Hg d−1was predicted for the Alcochete marsh and 175�mg Hg d−1for the entire salt marsh area of the Tagus estuary. � 2017
Centro de Qu�mica Estrutural, Instituto Superior T�cnico, Universidade de Lisboa, Av. Rovisco Pais 1, Lisboa, Portugal; Environment and Climate Change Canada, Aquatic Contaminants Research Division, Water Science and Technology Directorate, Montr�al, QC, Canada; Instituto Portugu�s do Mar e da Atmosfera I.P., Av. Brasilia, Lisboa, Portugal; Department of Chemistry, Trent University, Peterborough, ON, Canada; Department of Earth and Environmental Science, Acadia University, Irving Environmental Science Center, Wolfville, NS, Canada
Recommended Citation:
Can�rio J,, Poissant L,, Pilote M,et al. Salt-marsh plants as potential sources of Hg0 into the atmosphere[J]. Atmospheric Environment,2017-01-01,152