Carbon paste electrode and medium‐exchange procedure in adsorptive cathodic stripping voltammetry of selenium(IV)

Tommaso Ferri, Francesco Guidi, Roberto Morabito

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Abstract

An adsorptive cathodic stripping voltammetric method for the determination of Se(IV) is described. The method is based on the detection of the piazselenol complex formed by Se(IV) with 2,3‐diamino naphthalene (2,3 DAN) at pH 2 (0.01 mol L−1HC1 + 0.1 mol L−1KC1). The method is based on a medium‐exchange scheme and a carbon paste electrode (CPE). The preconcentration step is carried out at open circuit, and then the complex is stripped out by linear sweep voltammetry (LSV) after medium exchange (0.1 mol L−1HNO2+ 0.1 mol L−1KNO3where the working electrode is transferred). The method is characterized by a precision better than 8% and a limit of quantitation (10 times the standard deviation of the blank) of 1.25 × 10−7mol L−1(for 20 minutes of preconcentration time). The use of CPE coupled with the medium‐exchange scheme reduces the interferences (especially by different classes of surfactants) and improves the selectivity (much better than in the usual cathodic stripping voltammetry on mercury). Copyright © 1994 VCH Verlagsgesellschaft mbH
Original languageEnglish
Pages (from-to)1087 - 1093
Number of pages7
JournalElectroanalysis
Volume6
Issue number11-12
DOIs
Publication statusPublished - 1994
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Electrochemistry

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