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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.