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The calibration curves of (A) Zn(II), Cd(II), Pb(II) and Cu(II), and (C) Ag(I) measured by the carbon paste electrode modified with thermally produced chromium(III) oxide. Typical voltammograms show the simultaneous detection of (B) Zn(II), Cd(II), Pb(II), Cu(II), and (D) Ag(I), at different concentrations.
