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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Determination of carbofuran and diuron in FIA system using electrochemical sensor modified with organometallic complexes and graphene oxide

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Author(s):
Wong, Ademar [1] ; Taboada Sotomayor, Maria Del Pilar [1]
Total Authors: 2
Affiliation:
[1] State Univ Sao Paulo UNESP, Inst Chem, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Electroanalytical Chemistry; v. 731, p. 163-171, OCT 1 2014.
Web of Science Citations: 19
Abstract

This paper describes the development of an electrochemical sensor coupled to flow injection analysis system for the detection of pesticides. The proposed sensor was prepared using a carbon paste electrode modified with hemin and nickel (II) 1,48,11,15,18,22,25-octabutoxy-29H, 31H-phthalocyanine complex as possible catalysts P450 enzyme and graphene oxide in order to improve the sensitivity of the sensor. In the first place, we used the cyclic voltammetry in a response range of -0.2 to 1 V to monitor the electrochemical response of each pesticide. In optimized conditions, an amperometric study of the proposed sensor was conducted applying the potential of 0.45 and 0.8 V for the redox reaction of carbofuran-phenol and diuron. The system showed a linear response in a concentration range between 5.0 x 10(-6) and 1.4 x 10(-4) and 5.0 x 10(-5) and 1.0 x 10(-3) mol L-1 and detection limit of 1.7 x 10(-6) and 2.0 x 10(-5) mol L-1 for carbofuran and diuron, respectively. The proposed sensor was applied in soil and carrot samples and the results obtained in the recovery study were close to 100%. The reliability of the proposed sensor was confirmed after comparing the results with those obtained in the comparative method (HPLC). (C) 2014 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 11/12296-6 - Bi-biomimetic systems based on nanoparticles and nanoporous materials to obtain high sensitive and selective methods for determination of pesticides and dyes
Grantee:Maria Del Pilar Taboada Sotomayor
Support Opportunities: Regular Research Grants