DETERMINATION OF PYROGALLOL RED ON A GLASSY CARBON ELECTRODE MODIFIED WITH GOLD FILM AND CYSTEAMINE BY ADSORPTION VOLTAMMETRY (AdsV). POSSIBLE USE AS ELECTROCHEMICAL SENSOR
Abstract
Interaction pyrogallol red (RP) on glassy carbon electrode surface modified gold film (AUF)
and cysteamine (cis) was studied. Bearing in mind the order of the modification, it was found
that the response of oxidation of RP showed higher current to the electrode modified with
gold film electro-deposited on cysteamine glassy carbon (GC/Cis /AuF/E), which allows
the RP oxidation potential of 0.48 V at pH 3.25. Electrochemical devices, such as pH, scan
rate (Ʋ), adsorption potential (Eads) and adsorption time (tads) parameters were optimized to
yield values: pH 3.25; Ʋ 75.50mV s-1; Eads0.10 V and tads60 s respectively. The calibration
curve linearity reached a range between 2.00 x 10-7and 15.14x10-7mol L-1. The detection limit
(3S/m) was 1.20 x 10-7mol L-1 and relative standard deviation for measurements of seven
equal RP 5.0 x 10-4mol L-1 was 1.01%.
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