1. Repositório Institucional - Universidade Federal de Uberlândia
2. Faculdade de Engenharia Química (FEQUI)
3. TCC - Engenharia de Alimentos (Patos de Minas)

Tipo do documento:	Trabalho de Conclusão de Curso
Tipo de acesso:	Acesso Aberto
Título:	Dental amalgam electrode as voltammetric sensor to triazine-based pesticides determination: application in natural water samples
Autor(es):	Martins, Fernanda Cristina de Oliveira Lopes
Primeiro orientador:	Souza, Djenaine de
Primeiro membro da banca:	Silva, Lucas Moreira
Segundo membro da banca:	Muñoz, Rodrigo Alejandro Abarza
Resumo:	This paper describes the use of a dental amalgam electrode (DAE) allied to square wave voltammetry (SWV) in the analytical determination of the triazine-based pesticides ametryn (AM), atrazine (AT) and simazine (SI) in natural waters. Experimental and voltammetric parameters were optimized as Brinton-Robinson buffer at pH 2.5, with pulse frequency of 100 s-1, pulse amplitude of 50 mV and scan increment of -2 mV, where the triazines presented well-defined irreversible voltammetric peaks, at -1.05 V, -0.97 V and -0.99 V for AM, AT and SI respectively. For AM and SI was observed a redox reaction controlled by diffusion rate and for AT a reaction controlled by adsorption kinetic. Besides, in AM occurred the reduction of bond carbon-SCH3 and in AT and SI the reduction of bond carbon-chloride. Analytical curves were constructed, and the voltammetric signals were directly proportional to concentration, and to all triazines, the detection limits were lower than the maximum of residues permitted in natural water by Brazilian Environmental Agency, 100 g L-1 (100 ppb) and around the obtained using traditional techniques and other electrodic surfaces. The recovery percentages, in pure electrolyte and natural waters, were around 100%, demonstrating that the methodology proposed is suitable for determining any contamination by AM, AT and SI natural waters samples.
Palavras-chave:	Triazine-based pesticides Dental amalgam electrode Ametryn Simazine Atrazine Square wave voltammetry
Área(s) do CNPq:	CNPQ::CIENCIAS AGRARIAS::CIENCIA E TECNOLOGIA DE ALIMENTOS::CIENCIA DE ALIMENTOS CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA
Idioma:	eng
País:	Brasil
Editora:	Universidade Federal de Uberlândia
Referência:	MARTINS, Fernanda Cristina de Oliveira Lopes. Dental amalgam electrode as voltammetric sensor to triazine-based pesticides determination: application in natural water samples. 2019. 39 f. Trabalho de Conclusão de Curso (Graduação em Engenharia de Alimentos) - Universidade Federal de Uberlândia, Uberlândia, 2019.
URI:	https://repositorio.ufu.br/handle/123456789/26799
Data de defesa:	8-Jul-2019
Aparece nas coleções:	TCC - Engenharia de Alimentos (Patos de Minas)

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