Determination of s-triazines with copper and glassy carbon electrodes. Flow injection analysis of aziprotryne in water samples.
The detection and determination of s-triazines, atrazine-desethyl and aziprotryne by cyclic voltammetry and an amperometric method using a metallic copper electrode and a glassy carbon electrode are described. The concentrations of atrazine-desethyl and aziprotryne in 0.1 M NaOH solutions were determined using the oxidation signal corresponding to the Cu(0)/Cu(I) redox process. The detection level calculated for these s-triazines were 0.3 and 0.5 microg/mL of analyte, respectively. The glassy carbon electrode was shown to give sensitive reduction response to aziprotryne in flow injection mode. No special activation was required for the glassy carbon electrode. A detection limit of 0.2 microg/mL (20 ng aziprotryne) was obtained for a sample loop of 0.1 mL at a fixed potential of -1.0 V (vs. Ag/AgCl) in 0.1 M HCl and a flow rate of 3.5 mL/min. Furthermore, the glassy carbon electrode showed stable response in such a system, and the relative standard deviation was only 2.7% using the same surface, and 6.3% using different surfaces. The method developed was applied to the determination of aziprotryne in environmental and tap water samples; using a prior solid-phase extraction step, aziprotryne concentrations lower than 1.0 ng/mL could be measured.
Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Universidad Autónoma de Madrid, Spain.
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Zapardiel
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Bermejo
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Pérez
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Chicharro
D001280:Atrazine / Q000032:analysis; D002244:Carbon; D003300:Copper; D004566:Electrodes; D006540:Herbicides / Q000032:analysis*; D010084:Oxidation-Reduction; D012015:Reference Standards; D012680:Sensitivity and Specificity; D014227:Triazines / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
D006540:Herbicides; D014227:Triazines; D014874:Water Pollutants, Chemical; D002244:Carbon; D003300:Copper; C012418:mesoranil; D001280:Atrazine