Separation of metal bis(2-hydroxyethyl)dithiocarbamate complexes by micellar electrokinetic capillary chromatography

A method was developed for the separation of Cd-II, Pb-II, Pt-II, Co-II, Ni-II, Bi-III, Cr-II, Cu-II and Hg-II bis(2-hydroxyethyl)dithiocarbamate (HEDTC) complexes by micellar electrokinetic capillary chromatography. The complexes were formed by pre-capillary reaction of the metal ions with an excess of the ligand and then separated using a 100 mM berate buffer (pH 9.2) containing 4% methanol (v/v), 10 mM sodium dodecyl sulfate and 0,1 mM HEDTC, with detection at 254 nm, All the metal complexes, except Pt-II and Ph(II), were baseline resolved and separation was achieved in under 7 min, Detection limits were in the range 22 to 133 ppb.