Electrochemical Glyphosate Sensor Based on Hybrid Material SiO2/Sm2O3/Carbon Modified with Meldola Blue |
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| Authors: | Rodrigo Vieira Blasques Wilson S Fernandes-Junior Ana Márcia Rabelo Vieira Mendes Andressa Rose Castro Costa Thiago C Canevari Leliz Ticona Arenas Marcelo Barcellos da Rosa Gilvanda Silva Nunes Bruno Campos Janegitz Maria Raimunda Chagas Silva María Isabel Pividori Paulo Cesar Mendes Villis |
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| Institution: | 1. Laboratory of Sensors, Nanomedicine and Nanostructured Materials, Federal University of São Carlos, 13600-970 Araras, SP, Brazil;2. Electrochemistry and Biotechnology Laboratory – EBL, University of CEUMA – UNICEUMA, 65.065-470 São Luís, MA, Brazil;3. Environmental study group, Department of Chemistry, Federal Institute of Education, Science and Technology of Maranhão, Monte Castelo Campus, Getúlio Vargas Avenue, 65030-005 São Luis, Brazil;4. Escola de Engenharia, Universidade Presbiteriana Mackenzie, Higienópolis, 01302-907 São Paulo, SP, Brazil;5. Laboratory of Solids and Surfaces, Institute of Chemistry, Federal University of Rio Grande do Sul – UFRGS, 91501-970 Porto Alegre, RS, Brazil;6. Federal University of Santa Maria – UFSM, Department of Chemistry, Av. Roraima, 1000, 97105-900 Santa Maria, RS, Brazil;7. Department of Chemical Technology, Federal University of Maranhão, 65.080-040 São Luís, MA, Brazil;8. Grup de Sensors i Biosensors, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain |
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| Abstract: | In this work, we have proposed an electrochemical sensor for the detection of pesticides by using a ceramic composite with a SiO2 surface modified with Sm2O3 nanoparticles and C-graphite (SSMG), obtained by the sol-gel process and immobilized by adsorption in Meldola Blue cationic dye (MB). The composite was called (SSMG/MB), which was characterized by spectroscopic, electrochemical techniques, Fourier-transform infrared spectroscopy, and Cyclic Voltammetry. The proposed sensor was applied for the glyphosate electrochemical detection, using Differential Pulse Voltammetry, and, under optimized parameters has presented the linear response for the pesticide in the concentration range from 0.99 to 7.94 (μmol L−1; R2=0.9963; n=8). The calculated values for the detection limit and the quantification limit were 0.15 and 0.49 μmol L−1, respectively. Therefore, the new electrochemical sensor based on SiO2, NPsSm2O3, C-graphite, and MB hybrid material was developed for the first time for glyphosate determination, which has demonstrated high potential for the development of new hybrid devices for environmental control. |
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| Keywords: | ceramic material samarium oxide nanoparticles sensor Meldola Blue pesticide |
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