Composição química da precipitação atmosférica no sul do Brasil: estudo preliminar

• Autor(a) principal: Migliavacca,Daniela Montanari
• Data de Publicação: 2005
• Outros Autores: Teixeira,Elba Calesso, Machado,Andrea Cassia de Melo, Pires,Marçal Rodrigues
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Química Nova (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000300002
• topic: atmospheric precipitation; acid precipitation; factor analysis

The present work is a preliminary study of total and wet precipitation in the Candiota region, RS. The samples were collected from January to June 2001 at four different sites. The following variables were analysed: pH, conductivity, alkalinity, Cl-, NO3-, F-, SO4(2-), Na+, K+, Mg2+, NH4+, Ca2+ and Zn, Cu, Fe, Al, Mn. The results showed slightly acidic precipitation and higher concentrations of NH4+, Na+, Cl- and SO4(2-). Factor analysis applied to the variables studied allowed identifying the major sources. Na+, Cl- and Mg2+ have their origin in sea salts and NH4+, Ca2+, K+, SO4(2-) and NO3- are from local anthropogenic sources.