Detalhes bibliográficos
| Ano de defesa: |
2020 |
| Autor(a) principal: |
DIAS, Luciana Cutrim
 |
| Orientador(a): |
MARQUES, Edmar Pereira
|
| Banca de defesa: |
MARQUES, Edmar Pereira
,
VARELA JUNIOR, Jaldyr de Jesus Gomes
,
MOUCHREK FILHO, Victor Elias
|
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal do Maranhão
|
| Programa de Pós-Graduação: |
PROGRAMA DE PÓS-GRADUAÇÃO EM QUÍMICA/CCET
|
| Departamento: |
DEPARTAMENTO DE QUÍMICA/CCET
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Palavras-chave em Inglês: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
https://tedebc.ufma.br/jspui/handle/tede/3908
|
Resumo: |
Pyrene is considered an emerging microcontaminant due to its persistent toxicity in living beings, being a compound capable of spreading rapidly through tissues, as well as crossing the blood-brain barrier leaving the central nervous system unprotected, allowing the passage of toxic substances found in the blood . Therefore, it is of great importance to control this contaminant in groundwater. The present work aimed to propose a procedure for the determination of pyrene in groundwater at a gas station using a voltammetric eletrodo based on reduced graphene oxide in Britton Robson (BR) 0.5 mol L -1 , pH 4.0 buffer solution. The proposed eletrodo showed an excellent electrochemical performance for the oxidation of pyrene under optimized experimental conditions. Through the standard deviations of the calibration curves, LD and LQ were calculated for the analyte, where the detection limit obtained was 5.6 x 10-08 and the quantification limit 1.8 x 10-07. The linearity range varied between 9.9x10-6 mol L-1 to 4.7x10-5 mol L-1 . The coefficients of variation (precision) of the electroanalytical measurements of the eletrodo were 7.01% (repeatability) and 1.57% (reproducibility). The application of the eletrodo to a real sample was carried out using the enrichment method. The developed eletrodo was successfully applied in the determination of pyrene in a groundwater sample, in which a recovery of 101.3% (accuracy) was obtained. And the modified electrode showed a good electroanalytical response in terms of sensitivity and stability. These results indicate that this procedure is sufficiently suitable as an alternative method to determine the content of pyrene in groundwater. |
