Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media

Simple, low-cost and acid-resistant carbon-based screen-printed electrodes (SPEs) addressed to detection of hexavalent chromium species, Cr(VI), in sulfuric acid at pH about 1, were prepared and characterized. Working and counter electrodes were prepared jointly on the same substrate in a single str...

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Detalles Bibliográficos
Publicado:	2014
Materias:	Electrochemical sensors Hexavalent chromium Screen-printed electrodes Thick-film technology Amperometric determination Amperometric response Composite conductors POLY VINYL BUTYRAL PVB Screen printed electrodes Thermoplastic polymer Alumina Chromium Electrodes Sensors Silver Chromium compounds
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v195_n_p294_Miscoria http://hdl.handle.net/20.500.12110/paper_09254005_v195_n_p294_Miscoria
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_09254005_v195_n_p294_Miscoria
record_format	dspace
spelling	paper:paper_09254005_v195_n_p294_Miscoria2023-06-08T15:51:17Z Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media Electrochemical sensors Hexavalent chromium Screen-printed electrodes Thick-film technology Amperometric determination Amperometric response Composite conductors Hexavalent chromium POLY VINYL BUTYRAL PVB Screen printed electrodes Thermoplastic polymer Thick-film technology Alumina Chromium Electrochemical sensors Electrodes Sensors Silver Chromium compounds Simple, low-cost and acid-resistant carbon-based screen-printed electrodes (SPEs) addressed to detection of hexavalent chromium species, Cr(VI), in sulfuric acid at pH about 1, were prepared and characterized. Working and counter electrodes were prepared jointly on the same substrate in a single strip (working-counter electrodes pair). The batch printing process allowed obtaining many working-counter electrode pairs in a unique step. The developed working electrodes are comprised of several layers deposited on an alumina substrate: (1) bottom silver conductor, (2) dense organic-graphite composite conductor, (3) active layer consisting of a porous organic-graphite composite which contains a Cr(III) ionophore for testing Cr(III) obtained after reducing Cr(VI), and (4) an insulating and protective dielectric. All materials except the bottom Ag conductor were made on an organic matrix based on a thermoplastic polymer, polyvinylbutyral (PVB). The amperometric determination of Cr(VI) species at pH 1 was performed over a wide concentration range (dynamic range 3 μM-40 mM). The range for linear amperometric response is 3 μM-10 mM, with sensitivity about 0.08 mA mM-1. The sensitivity is improved in comparison with previously developed sensors, while keeping a low limit of detection (LOD about 1 μM). The response of the sensors are not interfered by the presence of Cr(III) in the solution, although the sensor can detect local formation of Cr(III) at the electrode surface after the reduction of Cr(VI) when diethylenetriamine-pentaacetic acid (DTPA), a complexing agent for Cr(III) is incorporated into the pastes. © 2014 Elsevier B.V. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v195_n_p294_Miscoria http://hdl.handle.net/20.500.12110/paper_09254005_v195_n_p294_Miscoria
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Electrochemical sensors Hexavalent chromium Screen-printed electrodes Thick-film technology Amperometric determination Amperometric response Composite conductors Hexavalent chromium POLY VINYL BUTYRAL PVB Screen printed electrodes Thermoplastic polymer Thick-film technology Alumina Chromium Electrochemical sensors Electrodes Sensors Silver Chromium compounds
spellingShingle	Electrochemical sensors Hexavalent chromium Screen-printed electrodes Thick-film technology Amperometric determination Amperometric response Composite conductors Hexavalent chromium POLY VINYL BUTYRAL PVB Screen printed electrodes Thermoplastic polymer Thick-film technology Alumina Chromium Electrochemical sensors Electrodes Sensors Silver Chromium compounds Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media
topic_facet	Electrochemical sensors Hexavalent chromium Screen-printed electrodes Thick-film technology Amperometric determination Amperometric response Composite conductors Hexavalent chromium POLY VINYL BUTYRAL PVB Screen printed electrodes Thermoplastic polymer Thick-film technology Alumina Chromium Electrochemical sensors Electrodes Sensors Silver Chromium compounds
description	Simple, low-cost and acid-resistant carbon-based screen-printed electrodes (SPEs) addressed to detection of hexavalent chromium species, Cr(VI), in sulfuric acid at pH about 1, were prepared and characterized. Working and counter electrodes were prepared jointly on the same substrate in a single strip (working-counter electrodes pair). The batch printing process allowed obtaining many working-counter electrode pairs in a unique step. The developed working electrodes are comprised of several layers deposited on an alumina substrate: (1) bottom silver conductor, (2) dense organic-graphite composite conductor, (3) active layer consisting of a porous organic-graphite composite which contains a Cr(III) ionophore for testing Cr(III) obtained after reducing Cr(VI), and (4) an insulating and protective dielectric. All materials except the bottom Ag conductor were made on an organic matrix based on a thermoplastic polymer, polyvinylbutyral (PVB). The amperometric determination of Cr(VI) species at pH 1 was performed over a wide concentration range (dynamic range 3 μM-40 mM). The range for linear amperometric response is 3 μM-10 mM, with sensitivity about 0.08 mA mM-1. The sensitivity is improved in comparison with previously developed sensors, while keeping a low limit of detection (LOD about 1 μM). The response of the sensors are not interfered by the presence of Cr(III) in the solution, although the sensor can detect local formation of Cr(III) at the electrode surface after the reduction of Cr(VI) when diethylenetriamine-pentaacetic acid (DTPA), a complexing agent for Cr(III) is incorporated into the pastes. © 2014 Elsevier B.V.
title	Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media
title_short	Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media
title_full	Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media
title_fullStr	Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media
title_full_unstemmed	Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media
title_sort	screen-printed electrodes for electroanalytical sensing, of chromium vi in strong acid media
publishDate	2014
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09254005_v195_n_p294_Miscoria http://hdl.handle.net/20.500.12110/paper_09254005_v195_n_p294_Miscoria
_version_	1768545057625866240

Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media

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