Determination of s-triazines with copper and glassy carbon electrodes. Flow injection analysis of aziprotryne in water samples

Citation
A. Zapardiel et al., Determination of s-triazines with copper and glassy carbon electrodes. Flow injection analysis of aziprotryne in water samples, FRESEN J AN, 367(5), 2000, pp. 461-466
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY
ISSN journal
0937-0633 → ACNP
Volume
367
Issue
5
Year of publication
2000
Pages
461 - 466
Database
ISI
SICI code
0937-0633(200007)367:5<461:DOSWCA>2.0.ZU;2-P
Abstract
The detection and determination of s-triazines, atrazine-desethyl and azipr otryne by cyclic voltammetry and an amperometric method using a metallic co pper electrode and a glassy carbon electrode are described. The concentrati ons of atrazine-desethyl and aziprotryne in 0.1 M NaOH solutions were deter mined using the oxidation signal corresponding to the Cu(O)/Cu(I) redox pro cess. The detection level calculated for these s-triazines were 0.3 and 0.5 mu g/mL of analyte, respectively. The glassy carbon electrode was shown to give sensitive reduction response to aziprotryne in flow injection mode. N o special activation was required for the glassy carbon electrode. A detect ion limit of 0.2 mu g/mL (20 ng aziprotryne) was obtained for a sample loop of 0.1 mi 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 st able response in such a system, and the relative standard deviation was onl y 2.7% using the same surface, and 6.3% using different surfaces. The metho d developed was applied to the determination of aziprotryne in environmenta l and tap water samples; using a prior solid-phase extraction step, aziprot ryne concentrations lower than 1.0 ng/mL could be measured.