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
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.