Standard Test Methods for Total and Dissolved Carbon Dioxide in Water

Importancia y uso:

4.1 Carbon dioxide is a respiration product of plants and animals and a decomposition product of organic matter and certain minerals. The atmosphere averages about 0.04 vol % of CO₂. Surface waters generally contain less than 10 mg/L, except at local points of abnormal organic or mineral decomposition; however, underground water, particularly deep waters, may contain several hundred mg/L.

4.2 When dissolved in water, CO₂ contributes significantly to corrosion of water-handling systems. This is particularly troublesome in steam condensate systems. Loss of CO₂ from an aqueous system can disturb the carbonate equilibrium and result in calcite encrustation of confining surfaces. Scaling of water heaters is a good example. Because of the delicate balance between corrosion and encrustation tendencies, much care must be given to control of CO₂ and related species in water systems. Recarbonation of municipal supplies during final stages of softening and amine neutralization of steam condensate are applied for these purposes.

Subcomité:

D19.05

Referida por:

D4328-18, D6316-17, D4195-23, D4129-05R20, D6807-17, F1581-08R20, C0375-22, D5929-18

Volúmen:

11.01

Número ICS:

13.060.50 (Examination of water for chemical substances)

Palabras clave:

carbon dioxide (CO2); coulometry; gas-sensing electrode;