Water Quality Monitoring: Conductivity to Salinity Conversion
Salinity
- Salinity is a measure of the mass of dissolved salts (ionic constituents) in a given mass of solution and usually expressed as parts per thousand (ppt).
- Ions commonly found in water include calcium, magnesium, potassium and sodium cations and bicarbonate, carbonate, chloride, nitrate, and sulfate anions.
- Conductivity is a good measure of salinity in water. Other indirect measures are water density, sound speed, and refractive index. All can be used to calculate salinity.
Calculations
- Collect conductivity (uS/cm) and water temperature (C) data.
- Use spreadsheet or calculator to convert conductivity and temperature data to salinity value.
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Equations used are based on the practical
salinity scale and are valid for surface waters
with salinity between 2 and 42 ppt. Please view
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Standard Methods for the Examination of
Water and Wastewater
if you have questions or concerns.
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