Abstract
Abstract Electrical conductivity and pH are the basic indices of rainfall pollution, constituting the basis for evaluation of the general nature of rainwater. This article presents an analysis of these two parameters in samples of rainfall collected in the years 2008-2010 (in the heating season and outside it) in three measurement sites P1, P2 and P3, located in the city and commune Strzelin (Lower Silesian Voivodeship). Preliminary results show a high variation of pH and electrical conductivity of rainfall occurring in the analysed area. Approximately 30% of the samples were characterised by a pH that allowed to qualify them, according to JANSEN et al. [1988], as normal rainfall. A similar share in all the collected samples represented rainfall of pH < 5.1 that was classified as slightly, considerably and highly acidic. The problem of acid rain occurred in the analysed area mainly during the heating season, when rainfall of pH < 5.1 accounted for a considerable share in all rainfall samples collected in the said period. The electrical conductivity of most samples fell below 60 μS·cm-1, which allowed us to classify them as slightly polluted rainfall (site P2), considerably polluted (site P3) and highly polluted (site P1).
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