The extraction of copper (II) with di‐2‐methylnonylphosphoric acid (DMNPA) (HA) has been investigated in n‐dodecane, toluene, and 1‐octanol as organic diluents at 28 ± 0.2°C. The extracted copper (II) species were found to be CuA2·2HA in n‐dodecane, CuA2·3HA in toluene, and CuA2 in 1‐octanol. The stoichiometry of the extracted metal species was compared with that of di‐2‐ethylhexylphosphoric acid (DEHPA) under the same experimental conditions. UV‐Vis and FT‐IR spectroscopic data on the extractants and their complexes indicated that the binding mode of the metal complexes varied with the polarity of diluents.
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Wang et al. (2003) studied this question.
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