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  • Contaminated Land, Ecological Assessment and Remediation Conference Series (CLEAR 2012) : Environmental Pollution and Risk Assessments
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Observations of mercury wet deposition in Mexico

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Abstract

We provide a longer-term record of Hg wet deposition at two tropical latitude monitoring sites in Mexico, selected to provide regionally representative data. Weekly wet deposition samples were collected over 2 years, from September 2003 to November 2005. Based on this data set, we discuss the magnitude and seasonal variation of Hg in wet deposition and compare the results to other measurement sites and to several model estimates. With precipitation-weighted mean (PWM) concentrations of 8.2 and 7.9 ng L−1, respectively, during the sampling period from Sep 30 2003 to Oct 11 2005, and median weekly concentrations of 9.4 ± 1 ng L−1 for both sites, the wet Hg concentrations and deposition at HD01 were much lower than those observed at the US Gulf Coast MDN sites while the wet Hg deposition at OA02 was much lower than most MDN sites, but somewhat similar to US MDN sites along the Pacific Coast. Based on the limited available data, we conclude that the approximately 30 % higher average precipitation at HD01 and roughly equal PWM concentrations lead to the higher deposition at HD01 versus OA02. We believe that these observations may offer scientists and modelers additional understanding of the depositional fluxes in the lower latitudes of North America.

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Acknowledgments

This research was supported by the Commission for Environmental Cooperation (CEC) through its Sound Management of Chemicals initiative under Action 3 - Mercury Implementation Task Force during the 2003-2005 Operational Plan. The authors would like to acknowledge the National Atmospheric Deposition Program (NADP) for providing sampling instruments and Frontier Geosciences (now Eurofins-Frontier Global Sciences) for the chemical analysis of total Hg. Also, thanks to Vic Shantora, Luke Trip, Eric Prestbo, José Carlos Tenorio, Rick Artz, Bob Brunette, Don MacKay, Víctor Gutiérrez Avedoy, Rocío Alatorre, José Castro, Gustavo Solórzano, Martha Ramírez, Alejandra López, Ulises López, Manfred van Afferden, and Axel Falcón for their guidance and assistance in this project.

Author information

Correspondence to Anne M. Hansen.

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Responsible editor: Gerhard Lammel

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Hansen, A.M., Gay, D.A. Observations of mercury wet deposition in Mexico. Environ Sci Pollut Res 20, 8316–8325 (2013). https://doi.org/10.1007/s11356-013-2012-3

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Keywords

  • MDN
  • Hidalgo
  • Oaxaca
  • Tropical regions
  • Low-latitude geographical areas