Preconcentration and quantification of copper,lead, and cadmium using anion exchangers modified with azo compounds

The sorption of azo compounds on anion exchangers of different basicity is studied; the physicochemical and analytical properties of the modified adsorbents are studied. For the prepared modified adsorbents, the conditions of the preconcentration and elution of copper, lead, and cadmium are determined. The analytical potency of the adsorbent Amberlite-Zincon for the group preconcentration and isolation of copper, lead, and cadmium from solutions of complex composition is demonstrated. An efficient combination procedure for the determination of copper, lead, and cadmium in geothermal waters are developed.