Square-wave voltametric method for determination of molinate concentration in a biological process using a hanging mercury drop electrode

Barroso, M.Fátima; Nunes, O. C.; Vaz, M. Carmo; Delerue-Matos, C.
February 2005
Analytical & Bioanalytical Chemistry;Feb2005, Vol. 381 Issue 4, p879
Academic Journal
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 5.0×10-6 to 9.0×10-6 mol L-1; this corresponded to a detection limit of 3.5×10-8 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.


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