pH of Feed brine pH of Raffinate ΔpH Extraction efficiency, % Distribution ratio, D
1.04 0.98 -0.06 97.54 39.63
2.01 1.69 -0.32 96.92 31.44
3.04 4.43 1.39 94.84 30.79
3.99 6.41 2.42 91.39 10.61
5.00 7.03 2.03 83.86 5.19
5.98 7.08 1.10 81.09 4.29
7.03 7.31 0.28 75.59 3.10