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Abstract
Chemically modified electrodes for Ag(I) ion determination were constructed by incorporating S2O2-donor podand, L1 with a carbon paste mixture composed of graphite powder. Ag(I) ion was chemically deposited onto the surface of the modified electrode and then reduced at -0.4 V vs. Ag/AgCl. Well-defined stripping voltammetric peak was obtained by scanning the potential to the positive direction. By differential pulse stripping voltammetry, the appropriate calibration graph for Ag(I) was obtained between 5.0 × 10-7 M and 1.5 × 10-6 M and detection limit was 2.0 × 10-7 M. The ionic species such as Cd(II), Cu(II), Zn(II), Hg(II), EDTA, and oxalate(II) did not influence the determination of Ag(I) ion, except Pb(II).
ACKNOWLEDGMENTS
The support of the Korea Research Foundation (Project No. 99-005-D00004) is gratefully acknowledged.
