Free glycerol determination in biodiesel samples using palladium nanoparticles modified glassy carbon electrode associated with solid phase extraction

Honório, Gláucio Gualtieri; Cunha, Jéssica Nogueira da; Assis, Kelly Leite dos Santos Castro; Aguiar, Paula Fernandes de; Andrade, Débora França de; Souza, Cristiane Gimenes de; d’Avila, Luiz Antonio; Archanjo, Bráulio S.; Achete, Carlos A.; Pradelle, Renata Norah Chaar; Turkovics, Franck; Neto, Rafael Serralvo; D’Elia, Eliane

doi:10.1007/s10008-019-04387-2

Cited by 15 publications

(1 citation statement)

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“…This material presents high conductivity, surface area, thermal and mechanical stability [19][20][21][22] . Using reduced graphene oxide on electrochemical sensors promotes an increase of the sensor sensibility because of an increase of their current response [23][24][25][26] .…”

Section: Introductionmentioning

confidence: 99%

A New Sensor Based on Reduced Graphene Oxide/Au Nanoparticles for Glycerol Detection

et al. 2020

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The projections for the global energy demand have been one of our society's greatest challenges, which has contributed significantly to the search for new sources of energy, among which biodiesel stands out and, consequently, the development of methods for quality assurance is essential to ensure its technological demand. In this context, a stable sensor based on graphene oxide and gold nanoparticles was developed for glycerol analysis. The electrochemically deposited gold nanoparticles presented the best results with a peak current (I p ) four times greater than the chemically produced gold nanoparticles. The combination of glassy carbon electrode with electrochemically reduced graphene and electrochemically deposited gold nanoparticles (GCE-ErGO-EAuNp) resulted in an efficient sensor to detect glycerol, promoting an I p increase. The proposed non-enzymatic method showed a linear response in the concentration range of 1.0 x 10 -3 to 1.0 x 10 -2% (w/w) with a good determination coefficient (r 2 = 0.9989), limits of detection and quantification at 1.2 x 10 -4% and 4.0 x 10 -4% (w/w), respectively, with a repeatability of (RSD% ranged from 0.36% to 2.78%), intermediate precision and recovery of (99.3% to 104.4%) and excellent stability of 700 continuous analysis cycles.

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