Voltammetric determination of 2-nitrobiphenyl and 4-nitrobiphenyl using a mercury meniscus modified silver solid amalgam electrode

Eva Horakova, Daniela Smidova, Vlastimil Vyskocil, Jiri Barek

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2 Citations (Scopus)

Abstract

Direct current voltammetry (DCV), differential pulse voltammetry (DPV), and differential pulse adsorptive stripping voltammetry (DPAdSV) at a mercury meniscus modified silver solid amalgam electrode (m-AgSAE) were used for the determination of trace amounts of carcinogenic 2-nitrobiphenyl (2-NBP) and 4-nitrobiphenyl (4-NBP) in buffered aqueous-methanolic solutions (for 2-NBP: 0.01 mol L-1 LiOH (pH 12.0) - methanol (9:1), for 4-NBP: 0.25 mol L-1 acetate buffer (AB) of pH 4.8-methanol (7:3)). Both nitrobiphenyls (NBPs) can be determined by DCV and DPV in the concentration range 0.2-100 μmol L-1 (limit of quantification (LQ) of both NBPs for DCV is 0.2 μmol L-1, LQ of 2-NBP and 4-NBP for DPV is 0.1 and 0.2 μmol L-1, respectively). An attempt to decrease the LQ using DPAdSV was not successful, probably due to some competitive adsorption. The optimal medium for the simultaneous determination of 2-NBP and 4-NBP by DPV at the m-AgSAE was: 0.10 mol L-1 AB of pH 6.0-methanol (7:3). The dependences of the peak current on the concentration of individual NBPs in the mixture were linear in the 10-6 and 10-7 mol L-1 concentration ranges. The practical applicability of the newly developed methods was verified using model samples of drinking and river water.

Original languageEnglish
Pages (from-to)2155-2169
Number of pages15
JournalInternational Journal of Electrochemical Science
Volume10
Issue number3
Publication statusPublished - 1 Jan 2015
Externally publishedYes

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Keywords

  • Drinking and river water
  • Nitrobiphenyls
  • Silver solid amalgam electrode
  • Simultaneous determination
  • Voltammetry

ASJC Scopus subject areas

  • Electrochemistry

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