Specific conductivity

Specific conductivity is a function of conductivity and temperature. This parameter is mostly applicable in studies of freshwater and brackish water. The units of measurement are μS/cm (microsiemens per centimetre).

RBR uses the algorithm described in Standard Methods for the Examination of Water and Wastewater by L.S. Clesceri et al, which yields specific conductivity normalised to 25°C.

where conductivity in mS/cm and temperature in °C are values measured by your RBR instrument, and 0.0191 is the default specific conductivity coefficient.

The specific conductivity coefficient is defined as the change in conductivity (in %) per 1°C. Its default value corresponds to an increase in conductivity of 1.91%. However, it depends on temperature and ionic composition of the water, ranging between 0.0175 and 0.0214 for natural lakes and rivers. You may be able to find the value specific to your body of water in literature or experimentally. In this case, adjust the specific conductivity coefficient manually in the table under the Parameters tab in Ruskin. See Ruskin User Guide: Standard Instruments³.

This method enables calculation of specific conductivity in a range 0 to 6000μS/cm and is valid in the temperature range -2°C to +35°C.