Dick, Grasiele  Schumacher, Mauro Valdir  <br/><br/>
Vegetation Burning in Pampa Biome Altered the Chemical Composition of Rainfall 

<br/><br/> Publicação on-line; 20 ref.; 2 tables; 4 illus.; Summary (En) 
<br/><br/> <br/><br/>ABSTRACT<br/><br/>Rainfall is one of the primary nutrient inputs to vegetation and its chemical composition is<br/>dependent on air quality as falling rain scavenges gaseous and particulate emissions from natural,<br/>industrial, and agricultural activities. The objective of this study was to evaluate whether the<br/>vegetation burn in a region of the Pampa biome influences the pH and chemical composition<br/>(anions) in incident rainfall. Nitrate, sulfate, and chloride concentrations, as well as the pH of<br/>the rainwater, were influenced by suspended particles in the atmosphere from biomass burning<br/>of native grassland and pasture renewal. The rainwater was acidified by, ash, and soot, which<br/>introduced large amounts of chloride and sulfate into the ecosystems caused by burning vegetation.<br/><br/>Keywords: rainwater acidification, anions, atmospheric pollution. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CHUVA ÁCIDA<br/>POLUIÇÃO DO AR<br/>ÂNION