NaTPB (mg) Concentration range (mol L-1) Slope (mV decade-1) R
5 1.0x10-6– 1.0x10-2 71.0 ± 1.8 0.999
7.5 1.0x10-6– 1.0x10-2 67.0 ± 3.1 0.999
10 1.0x10-6– 1.0x10-2 60.0 ± 2.3 0.999
12.5 1.0x10-6– 1.0x10-2 55.0 ± 3.1 0.999
15 1.0x10-6– 1.0x10-2 50.0 ± 1.0 0.999
20 1.0x10-6– 1.0x10-2 45.7 ± 2.7 0.999
25 1.0x10-6– 1.0x10-2 40.5 ± 2.4 0.998
Table 1: Effect of NaTPB content on the performance of ICPEs.