title: Facile electrocatalytic oxidation of diuron on polymerized nickel hydroxo tetraamino-phthalocyanine modified glassy carbon electrodes.
abstract: The facile electro-oxidation of diuron occurred at a glassy carbon electrode (GCE) modified with polymerized nickel tetraamino-phthalocyanine (NiTAPc), containing O-Ni-O bridges represented as poly-Ni(OH)TAPc-GCE. The oxidation of diuron occurred at a potential which is 60mV less than that of poly-NiTAPc (without O-Ni-O bridges) and was accompanied by enhanced catalytic currents. The catalytic rate constant and the diffusion constant were found to be 5.91 x 10(2)mol(-1)Ls(-1) and 6.43 x 10(-6)cm(2)s(-1), respectively. The linear concentration range of diuron was 3.0 x 10(-5) to 3.5 x 10(-4)molL(-1) with a limit of detection (LOD) of 3.3 x 10(-7)molL(-1) (3delta notation) and a sensitivity of 12.9Amol(-1)Lcm(-2).
authors.affiliation: Chemistry Department, Rhodes University, Grahamstown, South Africa.
authors.forename: Tawanda
authors.initials: T
authors.lastname: Mugadza
authors.forename: Tebello
authors.initials: T
authors.lastname: Nyokong