| Title: | Sources and diffusive air-water exchange of polycyclic aromatic hydrocarbons in an oligotrophic North-Patagonian lake |
| Author(s): | Tucca F; Luarte T; Nimptsch J; Woelfl S; Pozo K; Casas G; Dachs J; Barra R; Chiang G; Galban-Malagon C; |
| Address: | "Norwegian Institute for Water Research (NIVA) Chile, Puerto Varas, Chile; Departamento de Ciencias Biologicas, Facultad Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile. Electronic address: f.tucca@gmail.com. Departamento de Ciencias Biologicas, Facultad Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile; Doctorado en Medicina de la Conservacion, Facultad Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile; GEMA, Center for Genomics, Ecology & Environment, Universidad Mayor, Camino La Piramide 5750, Huechuraba, Santiago, Chile. Instituto de Ciencias Marinas y Limnologicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Casilla 567, Chile. Facultad de Ingenieria & Tecnologia, Universidad San Sebastian, Concepcion, Chile. Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA - CSIC), Barcelona, Spain. Department of Aquatic Systems, Faculty of Environmental Sciences, EULA Centre, University of Concepcion, Concepcion, Chile. Departamento de Ciencias Biologicas, Facultad Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile; Melimoyu Ecosystem Research Institute, Fundacion MERI, Santiago 7650720, Chile. Departamento de Ciencias Biologicas, Facultad Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile; GEMA, Center for Genomics, Ecology & Environment, Universidad Mayor, Camino La Piramide 5750, Huechuraba, Santiago, Chile. Electronic address: cristobal.galban@umayor.cl" |
| DOI: | 10.1016/j.scitotenv.2020.139838 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Polycyclic aromatic hydrocarbons (PAHs) are semivolatile organic compounds of environmental concern. This study aims to investigate the influence of local sources of anthropogenic PAHs and their air-water exchange fluxes in an oligotrophic North-Patagonian lake in Chile. The monitoring was carried out in Panguipulli Lake during a six-month period during the autumn and winter seasons (March to August 2017) using a high-volume air sampler and a pump system for water samples. We detected and quantified fifteen PAHs in the gas phase (mean summation operator(15)PAHs = 11.6 ng m(-3)) and dissolved water phase (mean summation operator(15)PAHs = 961.8 pg L(-1)). Methylphenanthrenes and pyrene dominated the concentrations of PAHs in the studied phases. To determine sources of PAHs we used the PAH ratios of Light Molecular Weight/Heavy Molecular Weight ( summation operatorLMW/ summation operatorHMW) and Phenanthrene/Anthracene (Phe/Ant). The PAH ratio results revealed a pyrogenic source. We estimated the air-water diffusive exchange fluxes and fugacity ratios for the studied compounds. In general, air-water diffusive exchanges of PAHs showed a net volatilization for the less hydrophobic (log K(OW) < 4) and lighter PAHs (MW /= 178 g mol(-1)). We found a significant correlation between log water/air fugacity ratios and log K(OW) of PAHs. Therefore, it is suggested that this oligotrophic lake acts as a sink by accumulating hydrophobic and mid-high molecular weight PAHs derived mainly from pyrogenic sources. This study is the first attempt to understand the sources and behavior of PAHs in oligotrophic lakes in the Southern Chile where information is scarce regarding the occurrence of PAHs" |
| Keywords: | Air-water exchange Fugacity Hydrophobic compounds Oligotrophic lake Patagonia Pyrogenic sources; |
| Notes: | "PubMed-not-MEDLINETucca, Felipe Luarte, Thais Nimptsch, Jorge Woelfl, Stefan Pozo, Karla Casas, Gemma Dachs, Jordi Barra, Ricardo Chiang, Gustavo Galban-Malagon, Cristobal eng Netherlands 2020/06/13 Sci Total Environ. 2020 Oct 10; 738:139838. doi: 10.1016/j.scitotenv.2020.139838. Epub 2020 May 30" |
