The Larson-Skold index refers to an empirical scale used to measure the degree of corrosiveness of water relative to mild steel metal surfaces. It is generated based on the in-situ corrosion of mild steel pipelines used to transport naturally occurring water from lakes and other freshwater sources.
The Larson-Skold index is the ratio of twice the number of moles per liter (mol/L) of sulfate (SO42-) plus chlorides (Cl-), to the moles per liter of alkalinity that is typically in the form of bicarbonate and/or carbonate. The Larson-Skold index scale presents the following outcomes of corrosion tendency:
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