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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.)

Pendimethalin determination in natural water, baby food and river sediment samples using electroanalytical methods

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Author(s):
Galli, Andressa [1] ; De Souza, Djenaine [2] ; Machado, Sergio A. S. [3]
Total Authors: 3
Affiliation:
[1] Univ Estadual Ctr Oeste Parana, Dept Quim, BR-85040080 Guarapuava, PR - Brazil
[2] Univ Fed Ceara, Ctr Ciencias, Dept Quim Analit & Fis Quim, BR-60455970 Fortaleza, Ceara - Brazil
[3] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Microchemical Journal; v. 98, n. 1, p. 135-143, MAY 2011.
Web of Science Citations: 16
Abstract

This work describes the electroanalytical determination of pendimethalin herbicide levels in natural waters, river sediment and baby food samples, based on the electro-reduction of herbicide on the hanging mercury drop electrode using square wave voltammetry (SWV). A number of experimental and voltammetric conditions were evaluated and the best responses were achieved in Britton-Robinson buffer solutions at pH 8.0, using a frequency of 500 s(-1). a scan increment of 10 mV and a square wave amplitude of 50 mV. Under these conditions, the pendimethalin is reduced in an irreversible process, with two reduction peaks at -0.60 V and -0.71 V. using a Ag/AgCl reference system. Analytical curves were constructed and the detection limit values were calculated to be 7.79 mu g L(-1) and 4.88 mu g L(-1), for peak 1 and peak 2, respectively. The precision and accuracy were determinate as a function of experimental repeatability and reproducibility, which showed standard relative deviation values that were lower than 2% for both voltammetric peaks. The applicability of the proposed methodology was evaluated in natural water, river sediments and baby food samples. The calculated recovery efficiencies demonstrate that the proposed methodology is suitable for determining any contamination by pendimethalin in these samples. Additionally, adsorption isotherms were used to evaluate information about the behavior of pendimethalin in river sediment samples. (C) 2010 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 05/00294-8 - Development and characterization of a bienzymatic biosensor to determine sugars in dietetic food
Grantee:Andressa Galli
Support Opportunities: Scholarships in Brazil - Doctorate