Níveis e origem da acidificação das chuvas na região do Rio Grande, RS

Abstract

Rio Grande-CP 474-96201-900-Rio Grande-RS Recebido em 17/5/99; aceito em 18/1/00 SOURCES AND LEVELS OF RAIN ACIDITY IN THE REGION OF THE RIO GRANDE CITY, RS, BRAZIL. The current article presents the first data on physical-chemical parameters of wet precipitation collected at single collection point in the city of Rio Grande, during the period of 12 months in 1997-1998. The employed technique of rainwater separation into several portions made clear the process of the atmosphere self-purification during a precipitation event. The pH of rain-water depends on the extent of industrial emissions and increases during a precipitation event. The first portion of rainwater shows an obvious neutralizing effect of soil and ocean-derived components , whose intensity depends on the duration of the preceding dry period.