Dissolved Gases

•           Carbon Dioxide

Dissolved carbon dioxide (C02) associates with water molecules to form carbonic acid (H2C03), reducing the pH and contributing to corrosion in water lines, especially steam and condensate lines.

Carbonic acid, in turn, dissociates to bicarbonate (HC03~) or carbonate (C032~), depending on pH. Most of the C02 found in water comes not from the atmosphere but from carbonate that the water has dissolved from rock formations.

•           Oxygen

Dissolved oxygen (02) can corrode water lines, boilers and heat exchangers, but is only soluble to about 14 ppm at atmospheric pressure

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