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

Autor(es)

Galli, Andressa ^[1] ; De Souza, Djenaine ^[2] ; Machado, Sergio A. S. ^[3]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Microchemical Journal; v. 98, n. 1, p. 135-143, MAY 2011.
• Citações Web of Science: 16

Resumo

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)

• Processo FAPESP: 05/00294-8 - Desenvolvimento e caracterização de um biossensor bienzimático para determinação de açúcares em alimentos dietéticos
• Beneficiário: Andressa Galli
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 03/03256-4 - Desenvolvimento de uma metodologia eletroanalitica para a determinacao do herbicida pendimethalin em aguas, solos e alimentos.
• Beneficiário: Andressa Galli
• Modalidade de apoio: Bolsas no Brasil - Mestrado