D-optimal design for electrochemical simultaneous determination of bentazon and fenamiphos in natural waters

Autor(es)

Codognoto, Lucia ^[1] ; Lima, Thays S. ^[1] ; Simoes, Fabio R. ^[2] ; Da Silva, Heron D. T. ^[1] ; Valle, Eliana M. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo UNIFESP, Inst Ciencias Quim & Farmaceut, Dept Quim, Diadema - Brazil

^[2] UNIFESP, Inst Mar, Santos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY; DEC 2021.
• Citações Web of Science: 0

Resumo

In this study, we proposed a new electroanalytical methodology using a boron-doped diamond electrode (BDD), associated with factorial design for simultaneous and selective determination of bentazon (BTZ) and fenamiphos (FNP). These pesticides are frequently combined for different crops and have overlapping oxidation potential signals (1.04 V and 1.13 V for BTZ and FNP, respectively). Thus, to enable simultaneous determination we used a 3(3) full factorial design with three parameters at three levels, using the D-optimal design. The optimised square wave voltammetry parameters were pH 4.0, frequency of 200 s(-1), pulse amplitude of 10 mV, and scan increment of 4.0 mV. These parameters were used for the construction of calibration curves, which showed linear ranges of 9.90 mu mol L-1 to 91.0 mu mol L-1 for BTZ and 4.95 mu mol L-1 to 69.0 mu mol L-1 for FNP. The limits of detection (LOD) and quantification (LOQ) were 0.38 mu mol L-1 and 1.27 mu mol L-1 for BTZ, and 1.50 mu mol L-1 and 4.98 mu mol L-1 for FNP. The performance of the method was evaluated using a natural water sample collected from a supply dam. The recovery values were 117.5% for BTZ and 88.6% for FNP. The results show that the developed method is suitable for the simultaneous determination of both pesticides in samples from natural water. (AU)

• Processo FAPESP: 17/24235-8 - Síntese e caracterização de complexos formados entre moléculas de pesticida e íons metálicos e seus impactos no ambiente
• Beneficiário: Eliana Maira Agostini Valle Akamatu
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/50588-6 - Eletrodos de ouro modificados por monocamadas auto-organizadas aplicados à determinação de pesticidas
• Beneficiário: Lucia Codognoto de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
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• Beneficiário: Fabio Ruiz Simões
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/24742-7 - Sensores baseados em compósitos de polímeros condutores e grafeno visando à determinação de substâncias desreguladoras endócrinas em ambiente marinho
• Beneficiário: Fabio Ruiz Simões
• Modalidade de apoio: Auxílio à Pesquisa - Regular