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(A) The effect of different ions (Fe3+, Mg2+, K+, Ca2+, Na+, NO3−, SO42−, Cl−) on the relative peak height of Zn(II), (B) Cd(II), (C) Pb(II) and (D) Cu(II) measured by the Cr-CPE in a mixture of Zn(II), Cd(II), Pb(II) and Cu(II). The concentration of each component in the mixture was 140 µg∙L−1.
