Determination of trace heavy metals in canned food using graphene/AuNPs/[Ru(NH 3 ) 6 ] ³⁺ /Nafion modified glassy carbon electrodes

• Main Authors: Palisoc, Shirley T., Bentulan, Joshua Micah O., Natividad, Michelle T.
• Format: text
• Published: Animo Repository 2019
• Subjects: Heavy metals; Nanoparticles; Graphene; Anodic stripping voltammetry; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/1753; https://animorepository.dlsu.edu.ph/context/faculty_research/article/2752/type/native/viewcontent
• Institution: De La Salle University

Graphene/gold nanoparticles (AuNPs)/hexaammineruthenium [Ru(NH 3 ) 6 ] 3+ /Nafion modified glassy carbon electrodes (GCE) were fabricated via the drop coating method. Cyclic voltammetry characterization of the fabricated electrodes revealed that increasing scan rates produced linearly increasing peak currents signifying a diffusion-controlled process in the electrochemical system. It was determined that the GCE modified with 2 mg graphene, 3 mg AuNPs and 1.5 mg [Ru(NH 3 ) 6 ] 3+ exhibited the highest sensitivity in the determination of Pb 2+ , Cd 2+ and Cu 2+ via anodic stripping voltammetry (ASV). All calibration curves obtained using the said electrode showed a linear relationship between heavy metal concentration and peak current and the detection limits were found to be 0.74 ppb for Pb 2+ , 37 ppb for Cd 2+ and 945 ppb for Cu 2+ . The modified electrode was successful in determining traces of Pb(II), Cu(I), Cu(II), Sn(IV) and Hg(II) in canned food samples. All trace heavy metal determination results from ASV were compared with the standard procedure of atomic absorption spectroscopy. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.