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A nitrate-selective microelectrode based on a lipophilic derivative of iodocobalt(III)salen

Abstract

The synthesis of iodo{2,2′-[1,2-octadecanediylbis(nitrilomethylidyne)]diphenolato}cobalt is described. Liquid membrane microelectrodes based on this carrier exhibit Nernstian behaviour with a selectivity sequence according to the Hofmeister series: I > NO3 > NO2 > Cl > HCO3 > AcO. The selectivity coefficient of nitrate over nitrite and chloride amounts to –1.6 and –2.7, respectively. The detection limit for nitrate in water amounts to 10–5.2 mol/L. A nitrate profile measured in a nitrifying biofilm is presented as a practical application.

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Received: 11 November 1998 / Revised: 22 January 1999 / Accepted: 27 January 1999

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Verschuren, P., van der Baan, J., Blaauw, R. et al. A nitrate-selective microelectrode based on a lipophilic derivative of iodocobalt(III)salen. Fresenius J Anal Chem 364, 595–598 (1999). https://doi.org/10.1007/s002160051392

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  • DOI: https://doi.org/10.1007/s002160051392

Keywords

  • Nitrate
  • Cobalt
  • Detection Limit
  • Nitrite
  • HCO3