Ryznar Equations Saturation and Stability Index

LANGELIER AND RYZNAR EQUATIONS SATURATION AND STABILITY INDEX 

A convenient method of interpreting water analysis for the purpose of determining the calcium carbonate solubility equilibrium conditions is embodied in the Langelier equation. The Langelier equation can be used to 

The Saturation Index is the difference between the actual measured pH and the calculated pH s at saturation with calcium carbonate  

C = calcium hardness, expressed as ppm CaC03 D = alkalinity, expressed as ppm CaC03 

If the Saturation Index is 0, water is said to be in chemical balance. If the Saturation Index is positive, scale-forming tendencies are indicated. Finally, if the Saturation Index is negative, corrosive tendencies are indicated. 

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