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Simulation of photoreactive transients and of photochemical transformation of organic pollutants in sunlit boreal lakes across 14 degrees of latitude: A photochemical mapping of Sweden
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.ORCID-id: 0000-0001-9212-2555
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2018 (engelsk)Inngår i: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 129, s. 94-104Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Lake water constituents, such as chromophoric dissolved organic matter (CDOM) and nitrate, absorb sunlight which induces an array of photochemical reactions. Although these reactions are a substantial driver of pollutant degradation in lakes they are insufficiently understood, in particular on large scales. Here, we provide for the first time comprehensive photochemical maps covering a large geographic region. Using photochemical kinetics modeling for 1048 lakes across Sweden we simulated the steady-state concentrations of four photoreactive transient species, which are continuously produced and consumed in sunlit lake waters. We then simulated the transient-induced photochemical transformation of organic pollutants, to gain insight into the relevance of the different photoreaction pathways. We found that boreal lakes were often unfavorable environments for photoreactions mediated by hydroxyl radicals ([rad]OH) and carbonate radical anions (CO3−[rad]), while photoreactions mediated by CDOM triplet states (3CDOM*) and, to a lesser extent, singlet oxygen (1O2) were the most prevalent. These conditions promote the photodegradation of phenols, which are used as plastic, medical drug and herbicide precursors. When CDOM concentrations increase, as is currently commonly the case in boreal areas such as Sweden,3CDOM* will also increase, promoting its importance in photochemical pathways even more.

sted, utgiver, år, opplag, sider
Elsevier, 2018. Vol. 129, s. 94-104
Emneord [en]
Boreal lakes, Browning, Modeling, Photochemical transients, Photochemistry, Pollutants
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Identifikatorer
URN: urn:nbn:se:uu:diva-336858DOI: 10.1016/j.watres.2017.10.064ISI: 000424716800010PubMedID: 29132125OAI: oai:DiVA.org:uu-336858DiVA, id: diva2:1167285
Forskningsfinansiär
Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning, 2009-1350-15339-81Swedish Research Council, 2011-3475-88773-67Knut and Alice Wallenberg Foundation, KAW 2013.0091Tilgjengelig fra: 2017-12-18 Laget: 2017-12-18 Sist oppdatert: 2018-04-11bibliografisk kontrollert

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Forlagets fulltekstPubMedhttps://doi.org/10.1016/j.watres.2017.10.064

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Koehler, BirgitTranvik, Lars

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