Journal
ATMOSPHERIC ENVIRONMENT
Volume 35, Issue 29, Pages 4937-4945Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1352-2310(01)00198-4
Keywords
wet deposition; acid rain; precipitation chemistry; land-use; Brazil
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [98/11429-6] Funding Source: FAPESP
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The influences of different kinds of anthropogenic activities on rainwater chemistry in a tropical area were studied during one uninterrupted year at Piracicaba River Basin (Southeast Brazil). A total of 272 rainwater samples collected continuously from August 1997 to July 1998 at four different sites were analyzed for F-, CH3COO-, HCOO-, MSA, Cl-, NO2-, Br-, NO3-, SO42-, C2O42-, PO43-, Na+, NH4+, K+, Mg2+, Ca2+, DOC (dissolved organic carbon), DIC (dissolved inorganic carbon), pH and conductivity. The most abundant ion was H+ and rain acidity was significant at all sampling sites (average pH of 4.4-4.5). The sources of this free acidity differ among sites and appear to be correlated to the different land-uses. The composition of rainwater appeared to be controlled mostly by three sources: soil dust, sugar cane burning and industrial emissions. (C) 2001 Elsevier Science Ltd. All rights reserved.
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