Measurement of fatty amine ethoxylate surfactants using electrochemiluminescence
Direct incorporation of fatty amine ethoxylate surfactants (trade names Ethomeen T/15 and Ethomeen T/25) into an electrochemiluminescence (ECL) reaction sequence is reported. A linear relationship between ECL intensity and concentration of surfactants exists using Ru(bpy)32+ (bpy: 2,2'-bipyridine) as the light emitting molecule. Detection limits of 0.7ppm (mg/l) and 0.9ppm have been observed for Ethomeen T/15 in aqueous buffer and seawater, respectively. Detection limits of 1.1ppm have been achieved for Ethomeen T/25. ECL intensity versus electrochemical potential profiles show that emission occurs at potentials corresponding to the oxidation of both Ethomeen and Ru(bpy)32+. The ECL emission is also pH dependent, with maximum intensities observed at pH ~8. These results parallel those observed when tri-n-propylamine is substituted for Ethomeen T/15 or T/25 and indicate a possible mechanism for ECL generation.
Electrochemiluminescence, Electrochemistry, Electrogenerated chemiluminescence, Ethoxylate surfacants, Spectroscopy
Alexander, Craig J., and Mark M. Richter. "Measurement of fatty amine ethoxylate surfactants using electrochemiluminescence." Analytica chimica acta 402, no. 1-2 (1999): 105-112.
Analytica Chimica Acta