Results of regression analysis (Table 1) of the variables: NaCl
concentration and field strength showed that each of these variables
individually had statistically significant effects (p < 0.05).
Notably, however, interaction effects were not significant. A key
consideration here is that for a given system geometry, the field
strength cannot be varied independently of NaCl concentration,
since high concentrations (also high electrical conductivity) result
in the potential for current overload, thus field strengths must be
correspondingly reduced to compensate.