Electrochemical detection of nitrate and nitrite at a copper modified electrode

J Davis, MJ Moorcroft, SJ Wilkins, RG Compton, MF Cardosi

    Research output: Contribution to journalArticle

    198 Citations (Scopus)

    Abstract

    The development of a reagentless electrode system for the determination of nitrate is presented. The approach is based upon the deposition of a macroporous copper deposit which shows marked selectivity for nitrate ion under mildly acidic conditions (pH 3) with a linear range extending from 10 to 200 mu M nitrate. Fabrication of the layer is both inexpensive and simple and is relatively substrate independent (Cu, Au, glassy carbon) as the response is attributed to the electrodeposited support. The influence of potential interferents such as chloride, nitrite and complexing agents such as citric acid were examined. In particular, the reduction of nitrite was found to occur at potentials significantly less negative than those required for nitrate reduction and as a result clear resolution of both voltammetric peaks is obtainable. The lack of direct interference between the two ions combined with wide peak separation (200 mV) provides a system that may offer some potential in speciation studies. The analytical applicability of the proposed system was demonstrated through the standard addition determination of nitrate in a number of authentic samples with the nitrate concentrations independently corroborated using established Griess assay spectroscopic protocols.
    LanguageEnglish
    Pages737-741
    JournalANALYST
    Volume125
    Issue number4
    Publication statusPublished - Apr 2000

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    Nitrites
    Nitrates
    Copper
    Electrodes
    Ions
    Copper deposits
    Glassy carbon
    Citric Acid
    Chlorides
    Assays
    Fabrication
    Substrates

    Cite this

    Davis, J., Moorcroft, MJ., Wilkins, SJ., Compton, RG., & Cardosi, MF. (2000). Electrochemical detection of nitrate and nitrite at a copper modified electrode. ANALYST, 125(4), 737-741.
    Davis, J ; Moorcroft, MJ ; Wilkins, SJ ; Compton, RG ; Cardosi, MF. / Electrochemical detection of nitrate and nitrite at a copper modified electrode. In: ANALYST. 2000 ; Vol. 125, No. 4. pp. 737-741.
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    abstract = "The development of a reagentless electrode system for the determination of nitrate is presented. The approach is based upon the deposition of a macroporous copper deposit which shows marked selectivity for nitrate ion under mildly acidic conditions (pH 3) with a linear range extending from 10 to 200 mu M nitrate. Fabrication of the layer is both inexpensive and simple and is relatively substrate independent (Cu, Au, glassy carbon) as the response is attributed to the electrodeposited support. The influence of potential interferents such as chloride, nitrite and complexing agents such as citric acid were examined. In particular, the reduction of nitrite was found to occur at potentials significantly less negative than those required for nitrate reduction and as a result clear resolution of both voltammetric peaks is obtainable. The lack of direct interference between the two ions combined with wide peak separation (200 mV) provides a system that may offer some potential in speciation studies. The analytical applicability of the proposed system was demonstrated through the standard addition determination of nitrate in a number of authentic samples with the nitrate concentrations independently corroborated using established Griess assay spectroscopic protocols.",
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    Davis, J, Moorcroft, MJ, Wilkins, SJ, Compton, RG & Cardosi, MF 2000, 'Electrochemical detection of nitrate and nitrite at a copper modified electrode', ANALYST, vol. 125, no. 4, pp. 737-741.

    Electrochemical detection of nitrate and nitrite at a copper modified electrode. / Davis, J; Moorcroft, MJ; Wilkins, SJ; Compton, RG; Cardosi, MF.

    In: ANALYST, Vol. 125, No. 4, 04.2000, p. 737-741.

    Research output: Contribution to journalArticle

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    AU - Wilkins, SJ

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    AB - The development of a reagentless electrode system for the determination of nitrate is presented. The approach is based upon the deposition of a macroporous copper deposit which shows marked selectivity for nitrate ion under mildly acidic conditions (pH 3) with a linear range extending from 10 to 200 mu M nitrate. Fabrication of the layer is both inexpensive and simple and is relatively substrate independent (Cu, Au, glassy carbon) as the response is attributed to the electrodeposited support. The influence of potential interferents such as chloride, nitrite and complexing agents such as citric acid were examined. In particular, the reduction of nitrite was found to occur at potentials significantly less negative than those required for nitrate reduction and as a result clear resolution of both voltammetric peaks is obtainable. The lack of direct interference between the two ions combined with wide peak separation (200 mV) provides a system that may offer some potential in speciation studies. The analytical applicability of the proposed system was demonstrated through the standard addition determination of nitrate in a number of authentic samples with the nitrate concentrations independently corroborated using established Griess assay spectroscopic protocols.

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    Davis J, Moorcroft MJ, Wilkins SJ, Compton RG, Cardosi MF. Electrochemical detection of nitrate and nitrite at a copper modified electrode. ANALYST. 2000 Apr;125(4):737-741.