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Advisor(s)
Abstract(s)
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.
Description
Keywords
Hanging mercury drop electrode Square-wave voltammetry Molinate Biodegradation
Citation
Publisher
Springer-Verlag