Informace o publikaci

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


LUARTE Thais TUCCA Felipe NIMPTSCH Jorge WOELFL Stefan CASAS Gemma DACHS Jordi CHIANG Gustavo POZO Karla Andrea BARRA Ricardo GALBAN-MALAGON Cristobal

Rok publikování 2022
Druh Článek v odborném periodiku
Časopis / Zdroj Environmental Research
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Klíčová slova North patagonian lakes; Air-water exchange; Legacy pollutants; Pesticides; South America
Popis In this study, the occurrence and diffusive air-water exchange of POPs in Panguipulli Lake (39 degrees 42' S-72 degrees 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 (alpha-HCH, beta-HCH, gamma-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 (f(w) f(a)(-1)), and net diffusive exchange fluxes (F-AW, ng m(-2) d(-1)) were also estimated. Total Sigma 4OCP levels in air ranged from 0.31 to 37 pg m(-3), with a maximum for beta-HCH, while Sigma 7PCB 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 Sigma(4)OCPs measured in this study ranged from 1.01 to 3.9 pg L-1, with gamma-HCH predominating, while surface water Sigma 7PCB 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, alpha-HCH, gamma-HCH and PCBs in the form of volatilization from the lake to air predominated; in contrast, for beta-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.

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