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Electrogeneration of Gold Nanoparticles on Porous-Carbon Paper-Based Electrodes and Application to Inorganic Arsenic Analysis in White Wines by Chronoamperometric Stripping.
Anal Chem. 2017 06 20; 89(12):6415-6423.AC

Abstract

This paper describes the development of simple, sustainable, and low-cost strategies for signal enhancement on paper-based carbon platforms through gold nanoparticles electrogenerated from small volumes of tetrachloroauric (III) acid solutions. Carbon ink is deposited on a hydrophilic working area of the paper delimited with hydrophobic wax. This maskless procedure is fast and cuts down ink waste. The connection of this working electrode to the potentiostat is ensured with the use of screen-printed electrodes (SPEs). Close contact of the whole area of both carbon electrodes improves the precision of the nanostructuration. Resulting gold-modified paper-based carbon working electrodes (AuNPs-PCWEs) were characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and electron dispersion X-ray spectrometry (SEM/EDX). This methodology was applied for the first time to the inorganic arsenic determination in commercial white wines by chronoamperometric stripping of the electrodeposited As(0). In an optimized system, As(III) was reduced and deposited as As(0) on the nanostructured surface by applying a potential of -0.3 V during 180 s. Then, anodic stripping chronoamperometry was performed at +0.4 V. The analytical signal was the current recorded at 30 s. On the other hand, As(V) was chemically reduced to As(III) with 0.2 M KI, and total determination of arsenic could be carried out. As(V) was determined as the difference between total As and As(III). Then, this fast, simple and low-cost method can be employed for speciation purposes. Limits of detection for As(III) and total arsenic (in the presence of KI) are 2.2 μg L-1 and 2.4 μg L-1, respectively, and indicate that this method is suitable for regulated quality control.

Authors+Show Affiliations

Departamento de Química Física y Analítica, Universidad de Oviedo , Asturias, Spain 33006.Departamento de Química Física y Analítica, Universidad de Oviedo , Asturias, Spain 33006.Departamento de Química Física y Analítica, Universidad de Oviedo , Asturias, Spain 33006.Departamento de Química Física y Analítica, Universidad de Oviedo , Asturias, Spain 33006.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

28530394

Citation

Nunez-Bajo, Estefanía, et al. "Electrogeneration of Gold Nanoparticles On Porous-Carbon Paper-Based Electrodes and Application to Inorganic Arsenic Analysis in White Wines By Chronoamperometric Stripping." Analytical Chemistry, vol. 89, no. 12, 2017, pp. 6415-6423.
Nunez-Bajo E, Blanco-López MC, Costa-García A, et al. Electrogeneration of Gold Nanoparticles on Porous-Carbon Paper-Based Electrodes and Application to Inorganic Arsenic Analysis in White Wines by Chronoamperometric Stripping. Anal Chem. 2017;89(12):6415-6423.
Nunez-Bajo, E., Blanco-López, M. C., Costa-García, A., & Fernández-Abedul, M. T. (2017). Electrogeneration of Gold Nanoparticles on Porous-Carbon Paper-Based Electrodes and Application to Inorganic Arsenic Analysis in White Wines by Chronoamperometric Stripping. Analytical Chemistry, 89(12), 6415-6423. https://doi.org/10.1021/acs.analchem.7b00144
Nunez-Bajo E, et al. Electrogeneration of Gold Nanoparticles On Porous-Carbon Paper-Based Electrodes and Application to Inorganic Arsenic Analysis in White Wines By Chronoamperometric Stripping. Anal Chem. 2017 06 20;89(12):6415-6423. PubMed PMID: 28530394.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electrogeneration of Gold Nanoparticles on Porous-Carbon Paper-Based Electrodes and Application to Inorganic Arsenic Analysis in White Wines by Chronoamperometric Stripping. AU - Nunez-Bajo,Estefanía, AU - Blanco-López,M Carmen, AU - Costa-García,Agustín, AU - Fernández-Abedul,M Teresa, Y1 - 2017/06/06/ PY - 2017/5/23/pubmed PY - 2019/3/7/medline PY - 2017/5/23/entrez SP - 6415 EP - 6423 JF - Analytical chemistry JO - Anal Chem VL - 89 IS - 12 N2 - This paper describes the development of simple, sustainable, and low-cost strategies for signal enhancement on paper-based carbon platforms through gold nanoparticles electrogenerated from small volumes of tetrachloroauric (III) acid solutions. Carbon ink is deposited on a hydrophilic working area of the paper delimited with hydrophobic wax. This maskless procedure is fast and cuts down ink waste. The connection of this working electrode to the potentiostat is ensured with the use of screen-printed electrodes (SPEs). Close contact of the whole area of both carbon electrodes improves the precision of the nanostructuration. Resulting gold-modified paper-based carbon working electrodes (AuNPs-PCWEs) were characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and electron dispersion X-ray spectrometry (SEM/EDX). This methodology was applied for the first time to the inorganic arsenic determination in commercial white wines by chronoamperometric stripping of the electrodeposited As(0). In an optimized system, As(III) was reduced and deposited as As(0) on the nanostructured surface by applying a potential of -0.3 V during 180 s. Then, anodic stripping chronoamperometry was performed at +0.4 V. The analytical signal was the current recorded at 30 s. On the other hand, As(V) was chemically reduced to As(III) with 0.2 M KI, and total determination of arsenic could be carried out. As(V) was determined as the difference between total As and As(III). Then, this fast, simple and low-cost method can be employed for speciation purposes. Limits of detection for As(III) and total arsenic (in the presence of KI) are 2.2 μg L-1 and 2.4 μg L-1, respectively, and indicate that this method is suitable for regulated quality control. SN - 1520-6882 UR - https://www.unboundmedicine.com/medline/citation/28530394/Electrogeneration_of_Gold_Nanoparticles_on_Porous_Carbon_Paper_Based_Electrodes_and_Application_to_Inorganic_Arsenic_Analysis_in_White_Wines_by_Chronoamperometric_Stripping_ L2 - https://doi.org/10.1021/acs.analchem.7b00144 DB - PRIME DP - Unbound Medicine ER -