, Volume 130, Issue 1-4, pp 1121-1126

Deposition Patterns of SO4 2−, NO3 and H+ in the Brazilian Territory

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SO4 2−, NO3 and H+ depositions are estimated in the Brazilian territory based on the existing rainfall chemical data and on annual rainfall distribution over the whole territory. Local and regional depositions are estimated. Rainfall chemical data over the Braziliian territory shows that the average pH values are usually low (between 4.0 and 5.5). These values are observed in the tropical Amazon forest as well as in urban areas. However, the rainwater acidity in the tropical forests are due to organic acids naturally produced by the vegetation while in urban areas the acidity is mainly due to acidic anion deposition (NO3 and SO4 2−). In some Amazonian areas, the average input values through rainfall for NO3 is about 0.06 keq.ha.yr−1 and for SO4 2− is between 0.23 and 0.54 keq.ha−1.yr−1. On the other hand, in some urban centers, such as São Paulo, values of .072 keq.ha−1.yr−1 for NO3 and 1.16 keq.ha−1.yr−1 of SO4 2− are found and in sites where sulfate sources (coal mining) are present, as for the area of Florianópolis, values as high as 5.59 keq.ha−1.yr−1 for SO4 2− are found.