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Reference type: Journal
Authors: Xie CG, Gao S, Guo QB, Xu K
Article Title: Electrochemical sensor for 2,4-dichlorophenoxy acetic acid using molecularly imprinted polypyrrole membrane as recognition element.
Publication date: 2010
Journal: Microchimica Acta
Volume: 169
Issue: (1)
Page numbers: 145-152.
DOI: 10.1007/s00604-010-0303-7

Abstract: Abstract: An electrochemical sensor based on molecularly imprinted polypyrrole membranes is reported for the determination of 2,4-dichlorophenoxy acetic acid (2,4-D). The sensor was prepared by electropolymerization of pyrrole on a glassy carbon electrode in the presence of 2,4-D as a template. The template was removed by overoxidation at +1.3 V in buffer solution. The sensor can effectively improve the reductive properties of 2,4-D and eliminate interferences by other pesticides and electroactive species. The peak current at -0.78 V is linear with the concentration of 2,4-D from 1.0 to 10 ÁM, the detection limit is 0.83 ÁM (at 3?), and the relative standard deviation is 3.9% (at 5.0 ÁM of 2,4-D; n = 7). The method has been successfully applied to the determination of 2,4-D in environmental water samples, with recovery rates ranging from 92% to 108%
Template and target information: 2,4-dichlorophenoxy acetic acid, 2,4-D
Author keywords: Molecularly imprinted polymers, polypyrrole, Electrochemical sensor, 2,4-D

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