title: Use of passive samplers to detect organochlorine pesticides in air and water at wetland mountain region sites (S-SE Brazil).
abstract: Low-density polyethylene (LDPE) passive samplers were deployed in upland surface waters and the overlying atmosphere during May and June 2012, to determine the transport and trends of freely dissolved and gaseous organochlorine pesticides (OCPs) along altitudinal gradients in mountain regions in south and southeast Brazil. Gaseous OCP concentrations were dominated by hexachlorobenzene (3.0-29 pg m(-3)) and endosulfans (Ʃ = α-endosulfan + β-endosulfan + endosulfan sulphate, 170-260 pg m(-3)), whereas freely dissolved endosulfans were significantly higher than all other OCPs (p < 0.001). The presence of some target pesticides at the highest elevation sites indicated their efficient high-altitude transport from regional sources. Air-water exchange gradients indicated net deposition of most volatile and recently banned OCPs (e.g., HCB, endosulfan) over Brazilian mountains. Moreover, the exposure of these sites to large-scale continental airflows with varying source contributions may partly explain the atmospheric deposition of selected OCPs over upland freshwaters at tropical and subtropical mountains sites in Brazil. These findings, coupled with LDPE passive air and water sampling measurements, point out the potential inputs from distant sources of semi-volatile chemicals to the two high-altitude sites.
authors.affiliation: Biophysics Institute, Rio de Janeiro Federal University, CCS, 21941-902, Rio de Janeiro, RJ, Brazil. Electronic address: rodrigo@xerem.ufrj.br.
authors.forename: Rodrigo Ornellas
authors.initials: RO
authors.lastname: Meire
authors.affiliation: University of Rhode Island, Graduate School of Oceanography, South Ferry Rd., Narragansett, RI, 02882, USA; Department of Environmental Sciences, Faculty of Science, Alexandria University, Alexandria, Egypt.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Khairy
authors.affiliation: Graduate Programme in Environmental Engineering, Federal University of Technology, Av. dos Pioneiros, 3131, 86036-370, Londrina, Brazil.
authors.forename: Admir Créso
authors.initials: AC
authors.lastname: Targino
authors.affiliation: Biophysics Institute, Rio de Janeiro Federal University, CCS, 21941-902, Rio de Janeiro, RJ, Brazil.
authors.forename: Petrus Magnus Amaral
authors.initials: PM
authors.lastname: Galvão
authors.affiliation: Biophysics Institute, Rio de Janeiro Federal University, CCS, 21941-902, Rio de Janeiro, RJ, Brazil.
authors.forename: Joåo Paulo Machado
authors.initials: JP
authors.lastname: Torres
authors.affiliation: Biophysics Institute, Rio de Janeiro Federal University, CCS, 21941-902, Rio de Janeiro, RJ, Brazil.
authors.forename: Olaf
authors.initials: O
authors.lastname: Malm
authors.affiliation: University of Rhode Island, Graduate School of Oceanography, South Ferry Rd., Narragansett, RI, 02882, USA.
authors.forename: Rainer
authors.initials: R
authors.lastname: Lohmann
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000531:Altitude; D001938:Brazil; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D020959:Polyethylene; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D014874:Water Pollutants, Chemical; D020959:Polyethylene
keywords: Brazil; Long-range atmospheric transport; Low density polyethylene (LDPE) passive samplers; Organochlorine pesticides