Figure 2: Plot of Kexmix versus log {([Ba2+][L]NB)1/2[Pic]} for the extraction of BaPic2 by L = 18C6 into NB. A broken line shows a regression one with R = 0.850 analyzed by Equation (5a). Its analysis yielded Kex/ mol−2 dm6 = (2.21 ± 0.56) × 107 at Kex/ mol−3 dm9 fixed in 5.6 × 1010.