Fig. 4

The relation between initial selenium(IV) concentration in the aqueous phase and its concentration in the organic phase at equilibrium during its extraction with Aliquat 336 / kerosene from hydrochloric acid solution. [Aliquat 336] = 0.4 mol/L; t = 45 min; [HCl] = 6 mol/L; T = 25 ^oC; O: A = 1:1