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Poly(3‐methylthiophene)‐Coated Carbon Fiber Microelectrode for the Voltammetric Measurement of Herbicide Metamitron
Author(s) -
de Armentia C. López,
Sampedro C.,
Goicolea M. A.,
Gómez de Balugera Z.,
Rodríguez E.,
Barrio R. J.
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199911)11:16<1222::aid-elan1222>3.0.co;2-n
Subject(s) - microelectrode , cyclic voltammetry , voltammetry , electrochemistry , cathodic protection , materials science , stripping (fiber) , fiber , reproducibility , analytical chemistry (journal) , cathodic stripping voltammetry , electrode , glassy carbon , chemistry , chromatography , composite material
A carbon fiber microelectrode was modified by electrodeposition of a polymeric coating of poly(3‐methylthiophene) (P3MT) by cycling the potential between 0.0 and +1.7 V (vs. Ag/AgCl). The electrochemical reduction of the herbicide metamitron in this kind of microelectrode was studied by applying several voltammetric techniques like cyclic voltammetry and square wave voltammetry. The cathodic stripping voltammetric response for metamitron was found to be dependent on the film thickness, the accumulation time and on the pH of measurement medium. A good linear relationship between the cathodic stripping peak current and metamitron concentration was obtained over the range 1.0×10 –8 –1.4×10 –7 mol L –1 , using a carbon fiber microelectrode modified with 15 coatings and 6 min preconcentration time at open circuit. The reproducibility of the measurements was satisfactory, RSD of 0.96 % ( n =10) and the detectability achieved was of 2.83×10 –10 mol L –1 .