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A nitrate-selective microelectrode based on a lipophilic derivative of iodocobalt(III)salen |
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| Authors: | P. G. Verschuren Juul L. van der Baan Rolf Blaauw Dirk de Beer Johannes C. van den Heuvel |
| Affiliation: | Instituut voor Technische Scheikunde, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, NL Scheikundig Laboratorium, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, NL Max-Planck-Institut für Marine Microbiology, Celciusstra?e 1, 28359 Bremen, Germany, DE |
| 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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