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Dissertacao_Saimon_Final.pdf.txt: 148365 bytes, checksum: 0a99c3be8d2cda4ce737a53a561cf7a5 (MD5) / O presente trabalho descreve o desenvolvimento de um sensor voltam?trico seletivo e sens?vel para a determina??o simult?nea de catecol (CC) e hidroquinona (HQ) usando um eletrodo de carbono v?treo (ECV) modificado com ftalocianina de mangan?s (MnPc) adsorvida sobre nanotubos de carbono de paredes m?ltiplas (NTCPM). O eletrodo modificado apresentou uma excelente atividade eletroqu?mica tanto para oxida??o quanto para a redu??o de CC e HQ. No ECV/NTCPM/MnPc tanto CC, quanto HQ podem gerar um par redox quase-revers?vel e picos bem definidos. Sob as condi??es experimentais e operacionais otimizadas, a corrente de pico cat?dica foi linear na faixa de 1,0 x 10-6 mol L-1 a 6,0 x 10-4 mol L-1 para ambos, CC e HQ, com limites de detec??o de 0,95 e 0,41 ?mol L-1, respectivamente. Adicionalmente, as correntes de pico an?dicas foram linear na faixa de 1,0 x 10-6 mol L-1 a 6,0 x 10-4 mol L-1 para ambos, CC e HQ, com limites de detec??o de 0,96 e 0,48 ?mol L-1, respectivamente. O m?todo proposto foi eficazmente aplicado na detec??o simult?nea de hidroquinona e catecol em amostras de ?gua. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012. / ABSTRACT
The present work describes the development of a selective and sensitive voltammetric sensor for catechol (CC) and hydroquinone (HQ) using a glassy carbon (GC) electrode modified with manganese phthalocyanine (MnPc) adsorbed on multiwalled carbon nanotubes (MWCNT). The modified electrode showed an excellent electrochemical activity towards the oxidations and reductions of CC and HQ. At the GC/MWCNT/MnPc electrode both CC and HQ can generate a pair of quasi-reversible and well-defined redox peaks. Under the optimized experimental and operational conditions, the cathodic peak current was linear over the 1.0 x 10-6 mol L-1 to 6.0 x 10-4 mol L-1 range for both CC and HQ, with detection limits of 0.95 and 0.41 ?mol L-1, respectively. In addition, anodic peak current were linear over the 1.0 x 10-6 mol L-1 range to 6.0 x 10-4 mol L-1 for both CC and HQ, with detection limits of 0.96 and 0.48 ?mol L-1, respectively. The proposed method was effectively applied to the simultaneous detection of hydroquinone and catechol in water samples.
| Identifer | oai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/279 |
| Date | 12 July 2012 |
| Creators | Silva, Saimon Moraes |
| Contributors | Mu?os, Rodrigo Alejandro Abarza, Santos, Wallans Torres Pio dos, Damos, Flavio Santos, Luz, Rita de C?ssia Silva, Damos, Flavio Santos, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Luz, Rita de C?ssia Silva |
| Publisher | UFVJM |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFVJM, instname:Universidade Federal dos Vales do Jequitinhonha e Mucuri, instacron:UFVJM |
| Rights | A concess?o da licen?a deste item refere-se ao ? termo de autoriza??o impresso assinado pelo autor, assim como na licen?a Creative Commons, com as seguintes condi??es: Na qualidade de titular dos direitos de autor da publica??o, autorizo a Universidade Federal dos Vales do Jequitinhonha e Mucuri e o IBICT a disponibilizar por meio de seus reposit?rios, sem ressarcimento dos direitos autorais, de acordo com a Lei n? 9610/98, o texto integral da obra disponibilizada, conforme permiss?es assinaladas, para fins de leitura, impress?o e/ou download, a t?tulo de divulga??o da produ??o cient?fica brasileira, e preserva??o, a partir desta data., info:eu-repo/semantics/openAccess |
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