Occurrence and air-water diffusive exchange legacy persistent organic pollutants in an oligotrophic north Patagonian lake

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dc.contributor.authorLuarte, Thais
dc.contributor.authorTucca, Felipe
dc.contributor.authorNimptsch, Jorge
dc.contributor.authorWoelfl, Stefan
dc.contributor.authorCasas, Gemma
dc.contributor.authorDachs, Jordi
dc.contributor.authorChiang, Gustavo
dc.contributor.authorPozo, Karla
dc.contributor.authorBarra, Ricardo
dc.contributor.authorGalbán-Malagón, Cristóbal
dc.date.accessioned2024-07-26T16:01:41Z
dc.date.available2024-07-26T16:01:41Z
dc.date.issued2022-03
dc.descriptionIndexación: Scopus.
dc.description.abstractIn this study, the occurrence and diffusive air-water exchange of POPs in Panguipulli Lake (39°42′S-72°13′W), an oligotrophic lake located in northern Patagonia (Chile), were determined. Air and water samples were collected between March and August 2017 (autumn-winter) and analyzed for concentrations of OCPs (α-HCH, β-HCH, γ-HCH and HCB) and PCBs (PCB-28,-52,-101,-118,-153,-158,-180) using gas chromatography coupled with an electron capture detector. The direction of air-water exchange direction was evaluated using a fugacity approach (ƒw ƒa−1), and net diffusive exchange fluxes (FAW, ng m−2 d−1) were also estimated. Total ∑4OCP levels in air ranged from 0.31 to 37 pg m−3, with a maximum for β-HCH, while Σ7PCB levels ranged from 3.05 to 43 pg m−3. The most abundant congener was PCB-153, accounting for 60% of the total PCBs in air. Surface water ∑4OCPs measured in this study ranged from 1.01 to 3.9 pg L−1, with γ-HCH predominating, while surface water Σ7PCB levels ranged from 0.32 to 24 pg L−1, with PCB-101, PCB-118, and PCB-153 presenting the highest levels. Diffusive air-water exchanges of HCB, α-HCH, γ-HCH and PCBs in the form of volatilization from the lake to air predominated; in contrast, for β-HCH net deposition dominated during the sampling period. Estimates suggested faster microbial degradation in the dissolved phase compared to atmospheric degradation for all analyzed POPs. Overall, these results could indicate that the oligotrophic lakes of northern Patagonia act as a secondary source of atmospheric POPs, mainly PCBs and some OCPs. This study is a first attempt to understand the occurrence of POPs in air and water, as well as their dynamics in oligotrophic lakes in the southern hemisphere. © 2021
dc.description.urihttps://www-sciencedirect-com.recursosbiblioteca.unab.cl/science/article/pii/S0013935121013372?via%3Dihub
dc.identifier.citationEnvironmental Research, Volume 204, March 2022, Article number 112042
dc.identifier.doi10.1016/j.envres.2021.112042
dc.identifier.issn0013-9351
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/58752
dc.language.isoen
dc.publisherAcademic Press Inc.
dc.rights.licenseAtribución/Reconocimiento-NoComercial-SinDerivados 4.0 Internacional CC BY-NC-ND 4.0 Deed
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subjectAir-water exchange
dc.subjectLegacy pollutants
dc.subjectNorth patagonian lakes
dc.subjectPesticides
dc.subjectSouth America
dc.titleOccurrence and air-water diffusive exchange legacy persistent organic pollutants in an oligotrophic north Patagonian lake
dc.typeArtículo
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