Deroco, Patricia B.
Melo, Iasmim G.
Silva, Lays S. R.
Eguiluz, Katlin I. B.
Salazar-Banda, Giancarlo R.
Total Authors: 6
 Univ Fed Sao Carlos, Dept Chem, POB 676, BR-13560970 Sao Carlos, SP - Brazil
 Univ Tiradentes, PEP, Res & Technol Inst, Electrochem & Nanotechnol Lab, BR-49032490 Aracaju, SE - Brazil
Total Affiliations: 2
SENSORS AND ACTUATORS B-CHEMICAL;
Web of Science Citations:
An amperometric method for the determination of hydrazine (HDZ) using a glassy carbon (GC) electrode modified with carbon black supported Au-Pd core-shell structured nanoparticles (Au@Pd/CB) within dihexadecylphosphate (DHP) film (Au@Pd/CB-DHP/GCE) is proposed. Au@Pd nanoparticles were synthesized by chemical reduction of AuCl3 and PdCl2 using ethylene glycol as a reducing agent, and the nanoparticles supported on CB were characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction techniques. The proposed Au@Pd/CB-DHP/GCE and CB-DHP/GCE (without Au@Pd) electrodes were used to investigate the electrochemical behavior of HDZ using cyclic voltammetry. When the Au@Pd/CB-DHP/GCE was used, an electrocatalytic effect was observed, the analytical signal was substantially increased (87%) and the oxidation potential decreased, i.e. in 728 mV. Additionally, the apparently heterogeneous electron transfer rate constant (k(0)) obtained for the Au@Pd/CB-DHP/GCE (0.15 cm s(-1)) was about two orders of magnitude greater than that obtained using the CB-DHP/GCE (0.068 cm s(-1)). Under the optimized conditions for the amperometric technique, a linear analytical curve for HDZ was obtained in the range of 2.50-88.0 mu mol L-1, with a limit of detection of 0.23 mu mol L-1 (0.0074 ppm). The proposed method was satisfactorily applied to determine the concentration of HDZ in natural lake and tap water samples. (C) 2017 Elsevier B.V. All rights reserved. (AU)