Direct Electrochemical Determination of Glyphosate at Copper Phthalocyanine/Multiwalled Carbon Nanotube Film Electrodes

A copper phthalocyanine/multiwalled carbon nanotube film‐modified glassy carbon electrode has been used for the determination of the herbicide glyphosate (Gly) at −50 mV vs. SCE by electrochemical oxidation using differential pulse voltammetry (DPV). Cyclic voltammetry and electrochemical impedance...

Full description

Saved in:
Bibliographic Details
Published in:Electroanalysis (New York, N.Y.) N.Y.), 2010-07, Vol.22 (14), p.1586-1591
Main Authors: Moraes, Fernando C., Mascaro, Lucia H., Machado, Sergio A. S., Brett, Christopher M. A.
Format: Article
Language:English
Subjects:
Buffer solutions
CARBON BASE MATERIALS
Carbon nanotubes
CHEMICAL ANALYSIS
Copper
COPPER PHTHALOCYANINE
Differential pulse voltammetry
Electrochemical impedance spectroscopy
Electrochemical oxidation
ELECTRODES
Glyphosate
MATHEMATICAL ANALYSIS
MICA
Multi wall carbon nanotubes
Nanotubes
OXIDATION
PHOSPHATES
TUBE
Voltammetry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A copper phthalocyanine/multiwalled carbon nanotube film‐modified glassy carbon electrode has been used for the determination of the herbicide glyphosate (Gly) at −50 mV vs. SCE by electrochemical oxidation using differential pulse voltammetry (DPV). Cyclic voltammetry and electrochemical impedance spectroscopy showed that Gly is adsorbed on the metallic centre of the copper phthalocyanine molecule, with formation of Gly‐copper ion complexes. An analytical method was developed using DPV in pH 7.4 phosphate buffer solution, without any pretreatment steps: Gly was determined in the concentration range of 0.83–9.90 μmol L−1, with detection limit 12.2 nmol L−1 (2.02 μg L−1).
ISSN:1040-0397
1521-4109
1521-4109
DOI:10.1002/elan.200900614