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 and Johannes C van den Heuvel |
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| Institution: | (1) Instituut voor Technische Scheikunde, Universiteit van Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands, NL;(2) Scheikundig Laboratorium, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, NL;(3) Max-Planck-Institut für Marine Microbiology, Celciusstra?e 1, 28359 Bremen, Germany, DE |
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| 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.
Received: 11 November 1998 / Revised: 22 January 1999 / Accepted: 27 January 1999 |
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