| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 291.64 KB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
The electrochemical behavior of the hydrolysis products of oxadiazon was studied by cyclic and square-wave voltammetry using a glassy
carbon electrode. Maximum currents were obtained at pH 12.8 in an aqueous electrolyte solution containing 30% ethanol and the current
did not decrease with time showing that there was little adsorption of the reaction products on the electrode surface. The hydrolysis products
of oxadiazon were identi®ed, after isolation and puri®cation, as 1-trimethylacetyl-2-(2,4-dichloro-5-isopropoxyphenyl)-2-ethoxycarbonylhydrazine
(Oxa1) and 1-trimethylacetyl-2-(2,4-dichloro-5-isopropoxyphenyl) hydrazine (Oxa2) with redox potentials 0.6Vand
70.1V (vs. Ag=AgCl), respectively. Based on the electrochemical behavior of 1-trimethylacetyl-2-(2,4-dichloro-5-isopropoxyphenyl)
hydrazine (Oxa2) a simple electroanalytical procedure was developed for the determination of oxadiazon in commercial products used in
the treatment of rice crops in Portugal that contain oxadiazon as the active ingredient. The detection limit was 161074 M, the mean content
and relative standard deviation obtained for seven samples of two different commercial products by the electrochemical method were
28.4 0.8% (Ronstar) and 1.9 0.2% (Ronstar GR), and the recoveries were 100.3 5.4% and 101.1 5.3 %, respectively.
Description
Keywords
Oxadiazon Herbicides Square-wave voltammetry Alkaline hydrolysis
Citation
Publisher
WILEY-VCH Verlag