Abstract

BOLANOS, Karen et al. Determination of pyrogallol red on a glassy carbon electrode modified with gold film and cysteamine by adsorption voltammetry (AdSV). Possible use as electrochemical sensor. Rev. Soc. Quím. Perú [online]. 2015, vol.81, n.2, pp.185-192. ISSN 1810-634X.

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 (Ú), adsorption potential (E_ads) and adsorption time (t_ads) parameters were optimized to yield values: pH 3.25; Ú 75.50mV s^-1; E_ads0.10 V and t_ads60 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%.

Keywords : Red pyrogallol; adsorption voltammetry; cysteamine; gold film.

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