Acid rain in a Mexican site on the coast of the Gulf of Mexico

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Rodolfo Sosa Echeverría
Humberto Bravo Álvarez
Ana Luisa Alarcón Jiménez
María del Carmen Torres Barrera
Mónica Jaimes Palomera
Pablo Sánchez Álvarez
Elías Granados Hernández


The activities taking place along the coast of the Gulf of Mexico are of great economic importance; however, these activities are potential sources of acid rain precursors. Potentially sensitive receptors to acid deposition in the coastal region of the Gulf of Mexico are lakes, rivers, forests, soils and monuments of cultural heritage. The aim of this study was to evaluate the chemical composition, enrichment factors and trends of wet atmospheric deposition at La Mancha, Veracruz, from 2003 to 2014. The major ions, pH and conductivity were analyzed daily during rainy and dry seasons. The following value ranges of the annual volume weighted mean (VWM) were: pH: 4.78-5.40; SO42–: 16-32 μeq L–1; NO3: 4-15 μeq L–1, among others. The principal findings were found: (1) acid rain has been present for more than a decade along the coast of the Gulf of Mexico; (2) the non-marine ions in decreasing order were: NO3, NH4+, Ca+ and SO42–; (3) all of the ions were present in major concentrations during the dry season due to minimal precipitation; (4) in several cases, the value of the pH events was low during the rainy season due to the low presence of chemical species that could favor neutralization; (5) the VWM pH in wet deposition was in the range of 4.78 to 5.40 during the study period (2003-2014), and (6) a significant increasing trend for pH was observed during the entire study period, while an increasing trend occurred from 2003 to 2008 for SO42–, NO3, K+ and Ca2+, which decreased until 2011 and then increased until 2014.


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Author Biography

Rodolfo Sosa Echeverría, Centro de Ciencias de la Atmósfera Universidad Nacional Autónoma de México Circuito Exterior s/n de Ciudad Universitaria Deleg. Coyoacán 04510 Ciudad de México, México

Titular Researcher, Environmental Pollution Section, Atmospheric Sciences Center, National University of Mexico (UNAM).

Professor of sampling and analysis of atmospheric pollutants at the Environmental Engineering Master and Doctorate Program at UNAM.

 Qualified Environmental Professional (QEP) by the Institute for Environmental Profession Practice (IPEP).


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