“…The effect of diluents on the solvent extraction of metal ions has been studied for copper(II) (Whewell et al, 1979;Wionczyk and Apostoluk, 1997;Tao and Nagaosa, 2003;Mitchell and Banks, 1969), cobalt(II) (Aly et al, 1979), nickel(II) (Rajab et al, 1987;Rezaei and Nedjate, 2003;Sun et al, 2000), iron(III) (Alguacil et al, 1987;Cai et al, 2016;Mountcastle et al, 1971), aluminium(III) (Bailey and Mahi, 1987), trivalent rare earths (Arichi et al, 2006;Cui et al, 2012;Dukov and Atanassova, 2003;El-Nadi, 2010;Pai et al, 1977;Rout et al, 2012), thorium (Siekierski, 1962), uranium (Sato et al, 1985;Shukla and Kedari, 1996) and trivalent actinides (Chiarizia and Horwitz, 1992;Ekberg et al, 2010Ekberg et al, , 2015. Lofstrom-Engdahl et al (2013, 2014a, 2014b, 2014c D2EHPA. The more polar diluents cyclohexanone, chloroform and 1-octanol exhibited the lowest distribution ratios.…”