SIMULTANEOUS DETERMINATION OF TRACE AMOUNTS OF METALS BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY AFTER PRECONCENTRATION WITH ADSORPTION ON CHLOROTRIFLUOROETHYLENE POLYMER AS THEIR HEXAMETHYLENEDITHIOCARBAMATE COMPLEXES

A method for the simultaneous determination of Bi, Cd, Cu, In, Ni and Pb by high-performance liquid chromatography is presented. These metal s are preconcentrated on poly(chlorotrifluoroethylene) resin particles as their hexamethylenedithiocarbamate (HMDC) complexes, and eluted wi th dimethyl sulfoxide, followed by HPLC separation and determination u sing an ODS column. The conditions for the adsorption of metal-HMDC co mplexes, such as the pH, HMDC concentration, amount of the resin parti cles and elution times with dimethyl sulfoxide, are discussed. The res ulting solution is suitable for injection into reversed-phase HPLC. Th e detection limits for the metals were found to be at sub mu g l(-1) l evels. The application of this principle to the trace analysis of Bi, Cd, Cu, In, Ni and Ph in high-purity aluminum is demonstrated.