Electrocatalytic oxidation of amitrole and diuron on iron(II) tetraaminophthalocyanine-single walled carbon nanotube dendrimer

FeTAPc-single walled carbon nanotube (SWCNT) dendrimers are employed as glassy carbon electrode modifiers for the electrocatalytic oxidations of amitrole and diuron. The catalytic rate constants were 4.55 x 10(3) M-1 s(-1) and 1.79 x 10(4) M-1 s(-1) for amitrole and diuron, respectively using chronoamperometric studies. The diffusion constants were found to be 1.52 x 10(-4) cm(2) s(-1) and 1.91 x 10(-4) cm(2) s(-1) for diuron and amitrole, respectively. The linear concentration range for both were from 5.0 x 10(-5) to 1.0 x 10(-4) M and sensitivities of 0.6603 mu A/mu M and 0.6641 mu A/mu M for amitrole and diuron, with corresponding limits of detection of 2.15 x 10(-7) and 2.6 x 10(-7) M using the 3 delta notation, respectively. (C) 2009 Elsevier Ltd. All rights reserved.