Abstract
The ternary interaction of pontachrome violet SW (PCV) with cetyltrimethylammonium bromide (CTAB) and Cu(II) at pH 10.5 has been investigated by a microsurface adsorption-spectral correction (MSASC) technique. The aggregation of PCV on CTAB obeyed the Langmuir isothermal adsorption. Results showed that the binding constant of the CTAB-PCV aggregate was K = 2.68·105 liter·mole−1. The ternary monomer complex Cu·PCV·CTAB2 was formed. The complexation between Cu and PCV is sensitive in the presence of CTAB and selective in the presence of thioglycolic acid, trisodium citrate, and p-phenanthroline, and it was applied to the determination of Cu trace with satisfactory result.
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