Chemical composition of atmospheric precipitation in Southern Brazil: preliminary study

Química Nova

Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre¹  Teixeira, Elba Calesso¹  Machado, Andrea Cassia de Melo¹  Fundação Estadual de Proteção Ambiental, Porto Alegre¹  Pires, Marçal Rodrigues¹  Migliavacca, Daniela Montanari¹ 

关键词: atmospheric precipitation;    acid precipitation;    factor analysis.;   

DOI  :  10.1590/S0100-40422005000300002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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-, SO42-, 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 SO42-. 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+, SO42- and NO3- are from local anthropogenic sources.

【 授权许可】

Unknown