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Single Sweep Polarographic Determination of Trace Nitrite in Ferrous and Ascorbic Acid Medium

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Abstract

The (FeNO)2+ complex can be formed in a solution that contains ferrous ion (ammonium ferrous sulfate), nitrite (sodium nitrite) and ascorbic acid. With a dropping mercury electrode, this complex has a catalytic wave at —0.58 V which can be used for the determination of trace nitrite in the range of 1×10-7 to 4×10-4 M with the detection limit of 5×10-8 M. The function of ascorbic acid is to reduce NO2- to NO quantitatively for complete formation of the electroactive complex. The mechanism of the electrode process has been studied by linear sweep polarography, direct current polarography, cyclic voltammetry and spectrophotometry.

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Authors and Affiliations

  1. Department of Chemistry, Wvhan University, Wuhan, People’s Republic of China

    Jianwei Mo, Duan Jin, Jianhong Pei & Zaofan Zhao

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  1. Jianwei Mo
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  2. Duan Jin
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  3. Jianhong Pei
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  4. Zaofan Zhao
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Mo, J., Jin, D., Pei, J. et al. Single Sweep Polarographic Determination of Trace Nitrite in Ferrous and Ascorbic Acid Medium. ANAL. SCI. 6, 251–255 (1990). https://doi.org/10.2116/analsci.6.251

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  • DOI: https://doi.org/10.2116/analsci.6.251

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