Rainwater major and trace element contents in Southeastern Brazil: an assessment of a sugar cane region in dry and wet period

Autor(es)

Oliveira, Patricia L. ^[1] ; Figueiredo, Bernardino R. ^[1] ; Cardoso, Arnaldo A. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Geol & Recursos Nat, BR-13083870 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Dept Quim Analit, BR-14801970 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 23, n. 12, p. 2258-2265, DEC 2012.
• Citações Web of Science: 8

Resumo

The purpose of this study was to assess the composition of the rainwater in Araraquara City, Brazil, a region strongly influenced by pre-harvest burning of sugar cane crops. Chemical and mineralogical variables were measured in rainwater collected during the harvest, dry period of 2009 and the non-harvest, wet period of 2010. Ca2+ and NH4+ were responsible for 55% of cations and NO3- for 45% of anions in rainwater. Al and Fe along with K were the most abundant among trace elements in both soluble and insoluble fractions. High volume weighted mean concentration (VWM) for most of the analyzed species were observed in the harvest, dry period, mainly due to agricultural activities and meteorological conditions. The chemistry of the Araraquara rainwater and principal component analysis (PCA) quantification clearly indicate the concurrence of a diversity of sources from natural to anthropogenic especially related to agricultural activities. (AU)

• Processo FAPESP: 08/58073-5 - Effects of emissions on current and future rainfall patterns in southeast Brazil
• Beneficiário: Arnaldo Alves Cardoso
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático