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Occurrence and Distribution of Deltamethrin and Diflubenzuron in Surface Sediments from the Reloncaví Fjord and the Chiloé Inner-Sea (~ 39.5ºS –43ºS), Chilean Patagonia

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Abstract

Surface sediments from Reloncaví Fjord and the Chiloé inner sea in Chilean Patagonia were extracted and analyzed to estimate deltamethrin and diflubenzuron levels. These antiparasitary pesticides have been used for decades in the salmon industry. Relationships were determined between pesticide concentrations and organic carbon percent in sediments. Deltamethrin (0.39–1.05 µg g−1 dw) was found at all sampling sites but diflubenzuron (0.06–0.09 µg g−1 dw) at only five. Diflubenzuron levels were similar for sediments from other fjord areas. However, deltamethrin concentration was 2–3 fold higher than other studies on this area. The organic carbon percent was correlated positively and significantly with diflubenzuron, but not with deltamethrin. Our results suggest that the high deltamethrin concentrations in sediments are due to the increased use of pyrethroids around salmon farming areas. But, the diflubenzuron levels can be explained by degradation processes.

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Acknowledgements

The authors thank Sergio Contreras and Gustavo Llanos for their help in elemental and stable isotopes analysis in the Regional Stable Isotope Laboratory, University of Pittsburgh. The authors also thank Esthefany Reyes for the chromatographic measurements. This work was funded by the Chilean National Oceanographic Committee Grant C19F1308 (JAP) and the Research Council of the Universidad Católica de la Santísima Concepción.

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Authors and Affiliations

  1. Department of Environmental Chemistry, Faculty of Sciences, Universidad Católica de la Santísima Concepción, Concepción, Chile

    Juan A. Placencia, Fernán Saavedra, Javier Fernández & Carolina Aguirre

  2. Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile

    Carolina Aguirre

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  1. Juan A. Placencia
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  2. Fernán Saavedra
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  3. Javier Fernández
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  4. Carolina Aguirre
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Correspondence to Juan A. Placencia.

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Placencia, J.A., Saavedra, F., Fernández, J. et al. Occurrence and Distribution of Deltamethrin and Diflubenzuron in Surface Sediments from the Reloncaví Fjord and the Chiloé Inner-Sea (~ 39.5ºS –43ºS), Chilean Patagonia. Bull Environ Contam Toxicol 100, 384–388 (2018). https://doi.org/10.1007/s00128-017-2251-y

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