The cyclic voltammetric characterization of a graphite electrode modified with silicone OV-17 was carried out on a solution of ferroine. Afterwards, the electrochemical behavior of carbenddzim following its accumulation on the electrode surface, was studied. Best conditions for its determination in the preconcentration and measurement steps were established. The method, with a relative error of 3.7% and a determination limit of 9.1 ng/mL, was applied for wine, apple and cultivated soil samples.
The electrochemical behavior of indole-3-acetic acid (LAA) with a silicone OV-17 modified carbon paste electrode was explored for the determination of this compound in plant tissues. Under optimum conditions, the procedure gave a linear concentration range up to 0.6 pg mL-l. with a limit of detection of O.Oj3 pg mL-', containing the preconcentration solution 0.08 hl HAc/Ac-buffer (pH 4 ) and 0.4 M phosphate buffer (pH 12) as a supporting electrolyte in the measurement cell. The accumulation time was 10 minutes~and the sweep potentials were carried out with a scan rate of 30 mV s-' with a pulse amplitude (AE) of 100 my. This method is available for the determination of IAA in plant tissues.KEY WORDS: OV-17 carbon paste modified electrode, Differential pulse voltammetn-, Indole-3-acetic acid determination.
This article describes the direct determination of the pesticide dimethoate in river water in an alkaline medium through cathodic stripping voltammetry. By employing an alkaline media and accumulation potential of 30 mV, reduction peak appears at -0.7 V. The detection limit is 1 ng m1-I.
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