Abstract
Di-2-methylnonylphosphoric acid (HA) as an extractant was investigated for the extraction of divalent metal ions into heptane at an aqueous ionic strength of 0.10 mol dm−3 (NaClO4) and at 25 °C. The extraction ability of metal complexes decreased in the order Cd(II) ≈ Mn(II) > Cu(II) > Co(II) > Ni(II). The metal complexes extracted were found to be all monomeric species for these metal ions using a slope analysis method. The curve fitting method was also applied to analyze the types of metal complexes extracted: MnA23HA and MnA24HA for manganese(II), CdA23HA and CdA24HA for cadmium(II), CuA22HA and CuA23HA for copper(II), CoA23HA and CoA24HA for cobalt(II) and NiA24HA and NiA25HA for nickel(II). Further, the extraction constants for the extracted metal complexes were evaluated. © 2002 Society of Chemical Industry
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