Posted: May 22nd, 2023

Langelier Saturation Index (LSI)

The measure is also commonly referred to as Langelier stability index. According to Stein (2008), the value of the index describes the stability of the calcium carbonate (CaCO3) contained in water. In addition, the value helps predetermine the likelihood of water dissolving, precipitating, or staying at equilibrium with the compound in question (Papavinasam, 2013). The index was developed by Wilfred Langelier in 1936. He predicted the pH level of water that would ensure it is fully saturated with calcium carbonate. The pH is normally referred to as pHs. The LSI is regarded as the difference between the actual pH and the saturation pH. As such, the computation below is used:

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