Abstract
Daily measurements of pH and conductivity of rainwater at Coimbra, Portugal in the period between autumn 1978 to autumn 1980 are reported. The average conductivity is 26 μΩ-1 cm-1 and the average pH is 4.75. Neutral salt contribution to conductivity is significant and is highest in autum/winter. Correlations between neutral salt conductivity and wind direction were found. pH values have a large dispersion and more than 30% of the samples had a pH (5.0. A seasonal variation of 1.2 pH units was found for the acidity with the highest average pH in autumn and the lowest in summer. A bimodal pH frequency distribution was found for the winter and spring seasons with a minimum frequency ranging from 5.7 to 5.3 pH units.
© 1983 J. S. Branco, S. J. Formosinho, published by Stockholm University Press
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