Abstract

TEIXEIRA, Elba C. et al. Study of wet precipitation and its chemical composition in South of Brazil. An. Acad. Bras. Ciênc. [online]. 2008, vol.80, n.2, pp. 381-395. ISSN 0001-3765.  http://dx.doi.org/10.1590/S0001-37652008000200016.

The purpose of this study is to analyze the chemical composition of wet precipitation in samples collected at three stations in the Candiota region in the Brazilian state of Rio Grande do Sul (RS). Samples were collected in 2004. Variables analyzed in wet precipitation were pH, conductivity, and concentration of Cl^-, NO₃^-, SO₄^2- F^-, Na⁺, Ca²⁺, Mg²⁺, K⁺, NH₄⁺, Cu, Zn, Fe, Mn, Pb, Ni, Cd, Co, and Cr. SO₂ and NO₂ distribution over the time were also evaluated. Results have showed that pH < 5.6 are found mostly at Candiota airport (85%), followed by Aceguá (72%) and Três Lagoas (65%). Enrichment Factor of the studied ions in wet deposition revealed higher Ca²⁺ and SO₄^2- enrichment in Três Lagoas. Factor Analysis applied to metals and major ions allowed identifying the major sources. While Cl^-, Na⁺, Mg²⁺ are of marine origin, SO₄^2-, NO₃^-, NH₄⁺ ,F^- come from anthropogenic sources. Except for Fe and Mn originating from the soil dust, the metals studied showed to have anthropogenic influence The average SO₂ and NO₂ concentration, as well as SO₄^2- and NO₃^- in wet precipitation in the Candiota region showed higher concentrations during the warmer months.

Keywords : wet precipitation; metals; factor analysis.