{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,19]],"date-time":"2026-02-19T00:10:19Z","timestamp":1771459819131,"version":"3.50.1"},"reference-count":101,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2021,2,7]],"date-time":"2021-02-07T00:00:00Z","timestamp":1612656000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["PTDC\/CTA-GQU\/31208\/2017"],"award-info":[{"award-number":["PTDC\/CTA-GQU\/31208\/2017"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"CQE, Instituto Superior T\u00e9cnico","award":["UIDB\/00100\/2020"],"award-info":[{"award-number":["UIDB\/00100\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Atmosphere"],"abstract":"<jats:p>In situ air concentrations of gaseous elemental mercury (Hg(0)) and vegetation\u2013atmosphere fluxes were quantified in both high (Cala Norte, CN) and low-to-moderate (Alcochete, ALC) Hg-contaminated saltmarsh areas of the Tagus estuary colonized by plant species Halimione portulacoides (Hp) and Sarcocornia fruticosa (Sf). Atmospheric Hg(0) ranged between 1.08\u201318.15 ng m\u22123 in CN and 1.18\u20133.53 ng m\u22123 in ALC. In CN, most of the high Hg(0) levels occurred during nighttime, while the opposite was observed at ALC, suggesting that photoreduction was not driving the air Hg(0) concentrations at the contaminated site. Vegetation\u2013air Hg(0) fluxes were low in ALC and ranged from \u22120.76 to 1.52 ng m\u22122 (leaf area) h\u22121 for Hp and from \u22120.40 to 1.28 ng m\u22122 (leaf area) h\u22121 for Sf. In CN, higher Hg fluxes were observed for both plants, ranging from \u22129.90 to 15.45 ng m\u22122 (leaf area) h\u22121 for Hp and from \u22128.93 to 12.58 ng m\u22122 (leaf area) h\u22121 for Sf. Mercury flux results at CN were considered less reliable due to large and fast variations in the ambient air concentrations of Hg(0), which may have been influenced by emissions from the nearby chlor-alkali plant, or historical contamination. Improved experimental setup, the influence of high local Hg concentrations and the seasonal activity of the plants must be considered when assessing vegetation\u2013air Hg(0) fluxes in Hg-contaminated areas.<\/jats:p>","DOI":"10.3390\/atmos12020228","type":"journal-article","created":{"date-parts":[[2021,2,8]],"date-time":"2021-02-08T20:51:51Z","timestamp":1612817511000},"page":"228","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Air Concentrations of Gaseous Elemental Mercury and Vegetation\u2013Air Fluxes within Saltmarshes of the Tagus Estuary, Portugal"],"prefix":"10.3390","volume":"12","author":[{"given":"Rute","family":"Ces\u00e1rio","sequence":"first","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal"}]},{"given":"Nelson J.","family":"O\u2019Driscoll","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Science, Acadia University, Irving Environmental Science Center, Wolfville, NS B4p 2r6, Canada"}]},{"given":"Sara","family":"Justino","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal"}]},{"given":"Claire E.","family":"Wilson","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Science, Acadia University, Irving Environmental Science Center, Wolfville, NS B4p 2r6, Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5061-2257","authenticated-orcid":false,"given":"Carlos E.","family":"Monteiro","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal"}]},{"given":"Henrique","family":"Zilh\u00e3o","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5190-446X","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Can\u00e1rio","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,2,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1080\/10643389609388485","article-title":"Environmental distribution and transformation of mercury compounds","volume":"26","author":"Stein","year":"1996","journal-title":"Crit. 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