| Abstract |
Two newly synthesized H+-selective ionophores: 2,3,4-tris(dodecyloxy)benzyldihexylamine and benzyldioctadecylamine, and six nitro-group containing solvents (2-nitrophenyl octyl ether, 2-nitrophenyl pentyl ether, 2-nitrophenyl phenyl ether, 1,2-dimethy1-3-nitrobenzene, 2-fluorophenyl 2-nitrophenyl ether, benzyl 2-nitrophenyl ether) were investigated to develop a membrane for glass-capillary H+- selective microelectrode with optimized measuring range for corrosion studies. It was shown that the microelectrode based on benzyldioctadecylamine and potassium tetrakis(4-chlorophenyl) borate as anionic site dissolved in 2-nitrophenyl octyl ether possessed the best working pH range (2.6-12.3), Nernstian slope (55.0 mV decade 1) and good time-related characteristics (potential drift 0.06 mV h(-1), potential reproducibility +/- 0.1 mV and response time). It was successfully applied for pH measurements over corroding cut-edge samples of metallic coated steel using scanning ion-selective electrode technique. (C) 2014 Elsevier B.V. All rights reserved. |
