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

Author(s)

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

Affiliation

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

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

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY; DEC 2021.
• Web of Science Citations: 0

Abstract

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)

• FAPESP's process: 17/24235-8 - Synthesis and characterization of complexes formed between pesticide molecules and metal ions and their impacts on the environment
• Grantee: Eliana Maira Agostini Valle Akamatu
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/23858-3 - Development of sensor materials based on self assembled fims of conducting polymers and carbon nanotubes for the determination of endocrine disrupters in marine environments
• Grantee: Fabio Ruiz Simões
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/24742-7 - Sensors based on composites of conducting polymers and graphene aiming the determination of endocrine disruptor substances in marine environment
• Grantee: Fabio Ruiz Simões
• Support Opportunities: Regular Research Grants