NEW VOLTAMMETRIC METHOD FOR DETERMINATION OF PHENANTHRENE IN GROUNDWATER
| Autor: | Aldaléa L. B. Marques, Ana Paula Mota Ferreira, I. M. de Oliveira, E. J. N. Teixeira, H. de A. Pinheiro |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Periódico Tchê Química. 16:169-177 |
| ISSN: | 2179-0302 1806-0374 |
| DOI: | 10.52571/ptq.v16.n33.2019.184_periodico33_pgs_169_177.pdf |
| Popis: | This work proposes a new method for the determination of phenanthrene (FEN) in aqueous medium with a cobalt phthalocyanine modified glassy carbon electrode (ECV / CoPc), using Differential Pulse Voltammetry (VPD), whose oxidation of FEN occurs between 1,3 and 1,4 V. The electrode was modified with a 1x10-3 mol∙L-1 CoPc methanolic solution containing 10% Nafion. For voltammetric measurements in Differential Pulse mode, an amplitude of 0.7V and a scan rate of 0.04V s-1 were used. Experimental parameters were optimized for the purpose of determination of FEN in groundwater collected in a water well of a São Luis-MA fuel station. Under these optimized conditions, an analytical curve was obtained in the 0.49 to 2,4 μM concentration range, with a detection limit of 1,2 x 10-10 mol∙L-1. The method was applied to a real groundwater sample from a water well located at a fuel station, and an average concentration of 0.037 μM FEN was found (n = 5), presenting a variation coefficient of 0.88, indicating good precision. Accuracy was assessed by the recovery test, whose average value was 99.9%. These results indicate that the proposed procedure is a good alternative for the analysis of FEN in natural water. |
| Databáze: | OpenAIRE |
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