Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/2947
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.
Delerue-Matos, Cristina
Palavras-chave: Hanging mercury drop electrode
Square-wave voltammetry
Molinate
Biodegradation
Data: 2005
Editora: Springer-Verlag
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.
Peer review: yes
URI: http://hdl.handle.net/10400.22/2947
Versão do Editor: http://link.springer.com/article/10.1007%2Fs00216-004-2971-9
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