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Design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis

A versatile potentiometer that works with electrode arrays in flow injection and/or monosegmented flow systems is described. The potentiometer is controlled by a microcomputer that allows individual, sequential multiplexed or random accesses to eight electrodes while employing only one reference ele...

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Autores principales: Rohwedder, Jarbas J. R., Pasquini, Celio, Raimundo, Jr., Ivo M., Conceiçao, M., Montenegro, B. S. M., Araújo, Alberto N., Couto, Cristina M. C. M.
Formato: Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2002
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2562961/
https://www.ncbi.nlm.nih.gov/pubmed/18924730
http://dx.doi.org/10.1155/S1463924602000147
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author Rohwedder, Jarbas J. R.
Pasquini, Celio
Raimundo, Jr., Ivo M.
Conceiçao, M.
Montenegro, B. S. M.
Araújo, Alberto N.
Couto, Cristina M. C. M.
author_facet Rohwedder, Jarbas J. R.
Pasquini, Celio
Raimundo, Jr., Ivo M.
Conceiçao, M.
Montenegro, B. S. M.
Araújo, Alberto N.
Couto, Cristina M. C. M.
author_sort Rohwedder, Jarbas J. R.
collection PubMed
description A versatile potentiometer that works with electrode arrays in flow injection and/or monosegmented flow systems is described. The potentiometer is controlled by a microcomputer that allows individual, sequential multiplexed or random accesses to eight electrodes while employing only one reference electrode. The instrument was demonstrated by monitoring an array of seven flow-through ion-selective electrodes for Ag(+) and for three electrodes for Cl(-), Ca(2+) and K(+). The figures of merit of the individual and multiplexed (summed) readings of the electrode array were compared. The absolute standard deviation of the measurements made by summing the potential of two or more electrodes was maintained constant, thus improving the precision of the measurements. This result shows that an attempt to combine the signals of the electrodes to produce a more intense signal in the Hadamard strategy is feasible and accompanied by a proportional improvement in the precision of individual measurements. The preliminary tests suggest that the system can allow for 270 determinations per hour, with a linear range from 1.0 × 10(-2) to 1.0 × 10(-4) mol l(-1) for the three di¡erent analytes. Detection limits were estimated as 3.1 × 10(-5), 3.0 × 10(-6) and 1.0 × 10(-5) mol l(-1) for Cl(-), Ca(2+) and K(+), respectively.
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spelling pubmed-25629612008-10-16 Design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis Rohwedder, Jarbas J. R. Pasquini, Celio Raimundo, Jr., Ivo M. Conceiçao, M. Montenegro, B. S. M. Araújo, Alberto N. Couto, Cristina M. C. M. J Autom Methods Manag Chem Research Article A versatile potentiometer that works with electrode arrays in flow injection and/or monosegmented flow systems is described. The potentiometer is controlled by a microcomputer that allows individual, sequential multiplexed or random accesses to eight electrodes while employing only one reference electrode. The instrument was demonstrated by monitoring an array of seven flow-through ion-selective electrodes for Ag(+) and for three electrodes for Cl(-), Ca(2+) and K(+). The figures of merit of the individual and multiplexed (summed) readings of the electrode array were compared. The absolute standard deviation of the measurements made by summing the potential of two or more electrodes was maintained constant, thus improving the precision of the measurements. This result shows that an attempt to combine the signals of the electrodes to produce a more intense signal in the Hadamard strategy is feasible and accompanied by a proportional improvement in the precision of individual measurements. The preliminary tests suggest that the system can allow for 270 determinations per hour, with a linear range from 1.0 × 10(-2) to 1.0 × 10(-4) mol l(-1) for the three di¡erent analytes. Detection limits were estimated as 3.1 × 10(-5), 3.0 × 10(-6) and 1.0 × 10(-5) mol l(-1) for Cl(-), Ca(2+) and K(+), respectively. Hindawi Publishing Corporation 2002 /pmc/articles/PMC2562961/ /pubmed/18924730 http://dx.doi.org/10.1155/S1463924602000147 Text en Copyright © 2002 Hindawi Publishing Corporation. http://creativecommons.org/licenses/by/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Rohwedder, Jarbas J. R.
Pasquini, Celio
Raimundo, Jr., Ivo M.
Conceiçao, M.
Montenegro, B. S. M.
Araújo, Alberto N.
Couto, Cristina M. C. M.
Design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis
title Design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis
title_full Design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis
title_fullStr Design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis
title_full_unstemmed Design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis
title_short Design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis
title_sort design and development of a multichannel potentiometer for monitoring an electrode array and its application in flow analysis
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2562961/
https://www.ncbi.nlm.nih.gov/pubmed/18924730
http://dx.doi.org/10.1155/S1463924602000147
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