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

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Brazilian Journal of Oceanography, ISSN: 1679-8759, Vol: 60, Issue: 1, Page: 33-39

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Christian J. Sanders; Renato G. S. Barcellos; Emmanoel V. Silva-Filho
FapUNIFESP (SciELO); Universidade de São Paulo, Instituto Oceanográfico
Earth and Planetary Sciences; Vapotranspiration; groundwater; major element/Cl ratio; diagenesis; Environmental Sciences
article description
Concentrations of cations and anions of major elements (Na, Ca, Mg, K, Cl, SO42-) 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/Clratios 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 SO42-/Cland Ca/Clratios suggest limited SOreduction and relatively high Ca/Clratios indicate a region of recent saltwater contact.