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Determination of copper(I) ion with a chemically modified carbon paste electrode based on di(2‐imino‐cyclopentylidine mercaptomethyl) disulfide
Author(s) -
Won MiSook,
Park Jinhyo,
Shim YoonBo
Publication year - 1993
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140050508
Subject(s) - copper , detection limit , differential pulse voltammetry , graphite , carbon disulfide , carbon paste electrode , chemistry , electrode , certified reference materials , electrochemistry , analyte , deposition (geology) , inorganic chemistry , voltammetry , cyclic voltammetry , nuclear chemistry , chromatography , organic chemistry , paleontology , sediment , biology
A copper‐sensitive chemically modified electrode (CME) has been constructed by incorporating di(2‐imino‐cyclopentylidine mercaptomethyl) disulfide (didd) into the carbon paste composed of graphite powder and Nujol oil. Copper(I) ion was chemically deposited on the CME by immersing it in the Cu(I) solution. The resulting surfaces were characterized by cyclic and differential pulse voltammetry. The CME's surface could be regenerated by applying more positive potential than the stripping potential of the Cu(I) ion and then used for another deposition. After seven deposition/measurement/ regeneration cycles, the peak current of voltammograms of the analyte decreases slightly. The differential pulse technique was also applied to the above system. In this case, the detection limit for Cu(I) ion was 5 × 10 −11 M for 30 minutes of deposition time. After reduction of Cu(II) ion to Cu(I) in the sample solution with hydroxylamine, satisfactory results were obtained for the determination of copper in certified standard urine reference material SRM's 2670 (trace elements in urine).