865727.fig.005
Figure 5: Variation in the conductance of the central compartment during electrodialysis; a constant electrical current of 0.15 A was applied to the conventional electrodialysis cell containing industrial phosphoric acid at 5% (—) and analytical-grade phosphoric acid at 5% with 6.27 g/L NaCl (- - - -); the initial and final temperatures and pH values are also reported.