Abstract
The solvent extraction of zinc(II) in 0.1 mol dm−3 sodium chloride solutions with 1-naphthoic acid (HA) into chloroform was measured in the absence and presence of tetrabutylammonium ions (tba+) or trioctylphosphine oxide (TOPO). The extraction of zinc(II) with 1-naphthoic acid was rather poor and the extracted species were in the form of ZnA2 and ZnA2(HA)2 when the metal concentration in the organic phase was lower than 3×10−5 mol dm−3. However, the polymerized species, ZnnA2n(HA)m, were also extracted when zinc(Il) concentration in the organic phase was higher than that value. The addition of tba+ or TOPO enhanced the extraction of zinc(II) 1-naphthoate. This was explained in terms of the extraction of tba+ZnA3− or ZnA2TOPO species. Thus 1-naphthoic acid was found to be an effective extractant for zinc(II) only in the presence of bulky cations or solvating type extractants. We considered the reason why only the monomeric zinc(II) species of the ternary complex or the TOPO adduct was extracted.
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