A Thermodynamic Model for Low Interfacial Tensions in Alkaline Flooding. Sharma, Mukul M.; Yen, T.F. SPE Journal. Volume 23, Number 1. February 1983

Many experimental studies have been undertaken to measure interfacial tensions (IFT’s) as a function of pH, salinity, temperature, and divalent ion concentrations.
The molecular approach involves a statistical mechanical calculation of the intermolecular forces operating at the interfaces between two phases.

abstract here

This citing is probably too old (1983)