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Advisor(s)
Abstract(s)
The electrochemical behaviour of the herbicide Asulam was studied by cyclic and square wave voltammetry.
Asulam may be irreversibly oxidised at a glassy carbon electrode. Maximum currents were obtained at
pH=1.9 in aqueous electrolyte solution. Based on the electrochemical behaviour of Asulam, two analytical
methodologies were developed for its determination in water samples, using square wave voltammetry
(SWV) and flow injection analysis (FIA) coupled with an amperometric detector. Limits of detection of
7.1x10-6 mol L-1 and 1.2x10-8 mol L-1 for SWV and FIA respectively, were achieved. Repeatability was
calculated by assessing the relative standard deviation (%) for 10 consecutive determinations of one
sample. The found values were 2.1% for SWV and 5.0% for FIA. Validation of the results provided by
SWV and FIA methodologies was performed by comparison with results from an HPLC-DAD technique.
Good relative deviations were found (<5%). Recovery trials were performed to assess the accuracy of the
results and the obtained values were between 84% and 107% for both methods.
Description
Keywords
Asulam Herbicides Oxidation Square wave voltammetry Flow injection analysis Amperometric detection
Citation
Publisher
Taylor & Francis