Major element concentrations in Mangrove Pore Water, Sepetiba Bay, Brazil

  • Christian J. Sanders Universidade Federal Fluminense; Instituto de Química; Departamento de Geoquímica
  • Renato G. S. Barcellos Universidade Federal Fluminense; Instituto de Química; Departamento de Geoquímica
  • Emmanoel V. Silva-Filho Universidade Federal Fluminense; Instituto de Química; Departamento de Geoquímica
Keywords: Evapotranspiration, Groundwater, Major Element/Cl Ratio, Diagenesis

Abstract

Concentrations of cations and anions of major elements (Na+, Ca2+, Mg2+, K+, Cl-, SO4 2-) were analyzed in the pore water of a mangrove habitat. Site specific major element concentrations were identified along a four piezometric well transect, which were placed in distinct geobotanic facies. Evapotranspiration was evident in the apicum station, given the high salinity and major element concentrations. The station landward of an apicum was where major element/Cl- ratios standard deviations are greatest, suggesting intense in situ diagenesis. Molar ratios in the most continental station (4) are significantly lower than the nearby freshwater source, indicating a strong influence of sea water flux into the outer reaches of the mangrove ecosystem and encroaching on the Atlantic rain forest. Indeed, the SO4 2-/Cl- and Ca2+/Cl- ratios suggest limited SO4 2- reduction and relatively high Ca2+/Cl- ratios indicate a region of recent saltwater contact.

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Published
2012-01-01
How to Cite
Sanders, C., Barcellos, R., & Silva-Filho, E. (2012). Major element concentrations in Mangrove Pore Water, Sepetiba Bay, Brazil. Brazilian Journal of Oceanography, 60(1), 33-39. https://doi.org/10.1590/S1679-87592012000100004
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