Simultaneous adsorptive stripping voltammetric measurements of trace chromium, uranium, and iron in the presence of cupferron

The ligand cupferron is used for the simultaneous adsorptive stripping voltammetric measurements of several trace metals. Experimental variables affecting such multielement capability, including the cupferron concentration, adsorption time or metal concentration are explored. Adequate resolution is demonstrated for up to five metals (FeIII, UVI, CrVI, VV, and BiIII), present at the ppb concentration level. Possible changes in peak heights, associated with competition for the complexing ligand and/or coadsorption effects, are explored. Different concentration ratios of the mixture components can be tolerated. Applicability to groundwater or river-water samples is illustrated.