Química Nova (Jan 2011)

Composição química das águas pluviais e deposição atmosférica anual na bacia do Alto Sorocaba (SP)

  • Fabiano Tomazini da Conceição,
  • Diego de Souza Sardinha,
  • Guillermo Rafael Beltran Navarro,
  • Maria Lúcia Pereira Antunes,
  • Vivian Andréa Angelucci

DOI
https://doi.org/10.1590/S0100-40422011000400011
Journal volume & issue
Vol. 34, no. 4
pp. 610 – 616

Abstract

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Two sampling points were chosen and forty samples were collected between January and December 2006 at Alto Sorocaba basin. The rainwater pH varied from 5.46 to 6.36 (Ibiúna) and 5.26 to 6.81 (Itupararanga), being Ca2+ the main ion responsible for controlling the rainwater pH. The ionic concentrations decreased in the following order: Ca2 +>Na+> Mg2+>K+ for cations and SO4(2-)>HCO3->NO 3->Cl- >PO4(3-) for anions. The annual atmospheric deposition appeared to be controlled mostly by following sources: mining activities and cement factories (Ca2+ and HCO3-), natural soil dust (Na+, Mg2+ and HCO3-), fossil fuel burning (SO4(2-)) and agriculture activities (K+, NO3- and PO4(3-)).

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