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|Título:||Square-wave voltametric method for determination of molinate concentration in a biological process using a hanging mercury drop electrode|
|Autor:||Barroso, M. Fátima|
Nunes, O. C.
Vaz, M. Carmo V. F.
|Palavras-chave:||Hanging mercury drop electrode|
|Relatório da Série N.º:||Analytical and Bioanalytical Chemistry; Vol. 381, Issue 4|
|Resumo:||A square-wave voltammetric (SWV) method using a hanging mercury drop electrode (HMDE) has been developed for determination of the herbicide molinate in a biodegradation process. The method is based on controlled adsorptive accumulation of molinate for 10 s at a potential of -0.8 V versus AgCl/Ag. An anodic peak, due to oxidation of the adsorbed pesticide, was observed in the cyclic voltammogram at ca. -0.320 V versus AgCl/Ag; a very small cathodic peak was also detected. The SWV calibration plot was established to be linear in the range 5.0x10-6 to 9.0x10-6 mol L-1; this corresponded to a detection limit of 3.5x10-8 mol L-1. This electroanalytical method was used to monitor the decrease of molinate concentration in river waters along a biodegradation process using a bacterial mixed culture. The results achieved with this voltammetric method were compared with those obtained by use of a chromatographic method (HPLC–UV) and no significant statistical differences were observed.|
|Versão do Editor:||http://link.springer.com/article/10.1007%2Fs00216-004-2971-9|
|Aparece nas colecções:||ISEP – GRAQ – Artigos|
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|ART_MBarroso_2005_GRAQ.pdf||96,21 kB||Adobe PDF||Ver/Abrir|
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