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Journal Article

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


de Beer,  Dirk
Permanent Research Group Microsensor, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Verschuren, P., van der Baan, J., Blaauw, R., de Beer, D., & van den Heuvel, J. (1999). A nitrate-selective microelectrode based on a lipophilic derivative of iodocobalt(III)salen. Fresenius' Journal of Analytical Chemistry, 364(6), 595-598. doi:10.1007/s002160051392.

Cite as: https://hdl.handle.net/21.11116/0000-0005-47FD-F
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.