Preconcentration and Determination of Organochlorine Pesticides in Seawater Samples Using Polyaniline/Polypyrrole-Cellulose Nanocomposite-Based Solid Phase Extraction and Gas Chromatography-Electron Capture Detection
نویسنده
چکیده
Neste trabalho, o papel de filtro quimicamente modificado com polianilina/polipirrol (PANI/PPY), denominado de nanocompósito PANI/PPY/celulose, foi preparado e usado como sorvente para extração em fase sólida (SPE) para a pré-concentração e extração de alguns pesticidas organoclorados (OCPs) em amostras de águas naturais. O sorvente proposto também foi caracterizado por microscopia eletrônica de varredura (SEM), que mostrou que polímeros globulares poderiam ser incorporados pelas fibras de celulose da folha de papel. Vários parâmetros experimentais relacionados à pré-concentração de OCPs no papel de filtro recoberto também foram examinados. Os resultados experimentais mostraram que o papel de filtro recoberto por PANI/PPY poderia extrair OCPs com fatores de enriquecimento relativamente altos. A avaliação também exibiu um intervalo dinâmico dos OCPs de 5-250 μg L com um coeficiente de correlação (R) apropriado. Os limites de detecção de heptacloro, aldrin, dieldrin, endrin e 4-diclorodifeniltricloroetano (4-DDT) foram determinados como sendo 0,39, 0,28, 0,47, 0,51 e 0,31 μg L, respectivamente. O método proposto também foi aplicado na análise de OCPs em amostra de água do mar e as recuperações dos analitos foram na faixa de 77,4 a 102,7%.
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