Abstract
The halogen-free ionic liquid, tetraoctylammonium-dodecylbenzene sulfonate was used to extract Cu 2+ , Pb 2+ , Cd 2+ , and Hg 2+ from their aqueous solutions using dithizone as chelating agent. Inductively coupled plasma-mass spectrometry (ICP-MS) was applied, at different pH-values, to simultaneously measure the metal content in the aqueous phase, before and after extraction. At the optimum pH value, extraction of the four metal cations from pure solution and marine water samples was successfully accomplished and their concentrations were simultaneously determined.
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