ABSTRACT
Treatment Plant Significance........................................................................................62 Effect on pH.............................................................................................................. 62 Water Softening........................................................................................................62
Analysis: Titration Method for Water Acidity........................................................... 62 Quality Control.........................................................................................................62 Apparatus.................................................................................................................. 62 Reagents ....................................................................................................................62 Procedure...................................................................................................................63 Federal Limits........................................................................................................... 64
Reference........................................................................................................................64
Carbon dioxide, the major acid component of all natural waters, enters surface waters by absorption from the atmosphere, and from aerobic and anaerobic bacterial action in the water. It is very soluble (up to 2000 ppm) and is always entering and leaving solution, depending on its partial pressure with atmospheric C 02. Once in the water, C 02 is in equilibrium with its ionized form, H2C 03 (carbonic acid), is being utilized by algae and other plant life, and reacting with the natural alkalinity of the water. Carbon dioxide is always in flux, and in clean surface waters 10 to 25 mg/1, as CaC03, is a normal concentration.
