Rainwater chemical composition and annual atmospheric deposition at Alto Sorocaba basin (SP)

Quimica nova

Sardinha, Diego de Souza¹  Conceição, Fabiano Tomazini da¹  Navarro, Guillermo Rafael Beltran¹  Antunes, Maria Lúcia Pereira²  Angelucci, Vivian Andréa² 

[1] Universidade Estadual Paulista, Rio Claro, Brasil;Universidade Estadual Paulista, Sorocaba, Brasil

关键词: watershed;    ionic composition;    air pollution.;   

DOI  :  10.1590/S0100-40422011000400011

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Two sampling pointswere chosen and forty samples were collected between January and December 2006at 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 responsiblefor controlling the rainwater pH. The ionic concentrations decreased in thefollowing order: Ca2 +>Na+> Mg2+>K+for cations and SO42->HCO3->NO3->Cl- >PO43- for anions.The annual atmospheric deposition appeared to be controlled mostly by followingsources: mining activities and cement factories (Ca2+ and HCO3-),natural soil dust (Na+, Mg2+ and HCO3-),fossil fuel burning (SO42-) and agriculture activities(K+, NO3- and PO43-).

【 授权许可】

CC BY