摘要：In this work were evaluated the correlations between the different forms of carbon dioxide naturally existing in fountain waters and the pH. Water samples were taken from five wells equally placed on the surface of Gorgota area in Dambovita county and were taken in each of the four seasons (spring, summer, autumn and winter). It was evaluated two forms of carbon dioxide (one was the aggressive CO2 and the other was that sequestered in bicarbonates molecules). It was used titration method based on the principle of calcium carbonate conversion in to bicarbonate form. The results showed that both forms of carbon dioxide naturally existing in underground waters are related to the pH, and also are fluctuating from a season to the other. For example, both forms of carbon dioxide significantly were influenced by pH in summer and autumn, the proof being the values of regression index which was 0.518 and respectively 0.794. That is showing a moderate to strong influence of pH in certain periods of the year. In spring, the influence of pH on carbon forms analyzed was insignificant one, the regression index value being only 0.173, and in the winter season was missing (R2 = 0.07). Also, the influence of carbon dioxide forms on the water pH level varied also from a season to another. Thus, carbon dioxide bicarbonates strongly influenced the pH of waters in winter and spring season, so the regression index value was 0.540 and 0.795. But in winter and summer the influence was insignificant. The aggressive carbon dioxide significantly influenced water pH in the summer season, the fact is indicated by the value of regression index which was 0.952. In the others seasons the influence of aggressive carbon dioxide was insignificant.
