Detalhes bibliográficos
| Ano de defesa: |
2011 |
| Autor(a) principal: |
CAMPOS, Rômulo Augusto Lins de
 |
| Orientador(a): |
BELIAN, Mônica Freire |
| Banca de defesa: |
PEREIRA, Claudete Fernandes,
LAVORANTE, André Fernando,
BATISTA, Élcio José,
FREITAS, Ana Paula de Sousa de |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal Rural de Pernambuco
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Química
|
| Departamento: |
Departamento de Química
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/6391
|
Resumo: |
Potentiometric sensors are known for their high sensitivity and selectivity. Such sensors have versatility, low cost and robustness, which ensures their applicability in a wide variety of complex chemical samples. The ion-selective electrodes for polymeric membrane are the best known potentiometric sensors, has by these traits. However, modified carbon paste electrodes have gained prominence due a great advance in their studies. This paper proposes an electrode chemically modified carbon paste for potentiometric determination of copper (II), using a new ionophore lariat-crown ether synthesized from precursor aminopropyl triethoxysilane is a silylating agent known in the literature. Studies were conducted to evaluate the influence of pH on the potential, the best buffer as supporting electrolyte, and the experimental design of mixtures to obtain the best composition of EQMPC. The proposed electrode showed a sensitivity of 38.5 mV/decade of activity with a detection limit of 2.04 x 10-5 mol L-1, and as a supporting electrolyte buffer biftalate/HCl pH = 3.0 proving to be promising for application in the determination of Cu(II). The electrode showed no significant analytical sensitivity to Co(II), Ni(II) and Zn(II) being these their main interferences. |
