Yes, salinity can be calculated from the chloride ion concentration using Go Direct^® Chloride Ion-Selective Electrode (GDX-CL) or Chloride Ion-Selective Electrode (CL-BTA) using the following equation:

          salinity (ppt) = 0.0018066 x Cl^– (mg/L)*

This equation is only valid for ocean water, not fresh or brackish water.

The complete procedure can be found in Water Quality with Vernier (WQV).

*Woolsey, et al, 1969