Open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique

Two microelectrodes inserted at different closely spaced heights in the channel of a conventional moving boundary apparatus, are externally connected through a current-sensitive device and a condenser. At the moment of the boundary passage, the abrupt change in the ohmic drop between the two electro...

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Detalles Bibliográficos
Autores principales: Passeron, Eduardo J., Gonzalez, Ernesto Rafael
Publicado: 1967
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220728_v14_n4_p393_Passeron
http://hdl.handle.net/20.500.12110/paper_00220728_v14_n4_p393_Passeron
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00220728_v14_n4_p393_Passeron
record_format dspace
spelling paper:paper_00220728_v14_n4_p393_Passeron2023-06-08T14:45:18Z Open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique Passeron, Eduardo J. Gonzalez, Ernesto Rafael Two microelectrodes inserted at different closely spaced heights in the channel of a conventional moving boundary apparatus, are externally connected through a current-sensitive device and a condenser. At the moment of the boundary passage, the abrupt change in the ohmic drop between the two electrode sites causes a readjustment of the charges on the capacities of the electrode circuit involving a small transient current peak of a few hundredths of a microampere. This provides a sensitive signal for the timing of the boundary. The boundary velocity may be determined using pairs of microelectrodes conveniently placed along the channel. The method has been tested by calibration of the volume between two such electrode pairs. The standard deviation in a series of eleven measurements was 0.2%. The technique can be used at high dilutions. Although it has been tested only in aqueous solution it should be adequate for measurements in non-aqueous solvents. © 1967. Fil:Passeron, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gonzalez, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1967 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220728_v14_n4_p393_Passeron http://hdl.handle.net/20.500.12110/paper_00220728_v14_n4_p393_Passeron
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Two microelectrodes inserted at different closely spaced heights in the channel of a conventional moving boundary apparatus, are externally connected through a current-sensitive device and a condenser. At the moment of the boundary passage, the abrupt change in the ohmic drop between the two electrode sites causes a readjustment of the charges on the capacities of the electrode circuit involving a small transient current peak of a few hundredths of a microampere. This provides a sensitive signal for the timing of the boundary. The boundary velocity may be determined using pairs of microelectrodes conveniently placed along the channel. The method has been tested by calibration of the volume between two such electrode pairs. The standard deviation in a series of eleven measurements was 0.2%. The technique can be used at high dilutions. Although it has been tested only in aqueous solution it should be adequate for measurements in non-aqueous solvents. © 1967.
author Passeron, Eduardo J.
Gonzalez, Ernesto Rafael
spellingShingle Passeron, Eduardo J.
Gonzalez, Ernesto Rafael
Open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique
author_facet Passeron, Eduardo J.
Gonzalez, Ernesto Rafael
author_sort Passeron, Eduardo J.
title Open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique
title_short Open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique
title_full Open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique
title_fullStr Open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique
title_full_unstemmed Open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique
title_sort open circuit electrical detection method for transport number measurements in dilute solutions by the moving boundary technique
publishDate 1967
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220728_v14_n4_p393_Passeron
http://hdl.handle.net/20.500.12110/paper_00220728_v14_n4_p393_Passeron
work_keys_str_mv AT passeroneduardoj opencircuitelectricaldetectionmethodfortransportnumbermeasurementsindilutesolutionsbythemovingboundarytechnique
AT gonzalezernestorafael opencircuitelectricaldetectionmethodfortransportnumbermeasurementsindilutesolutionsbythemovingboundarytechnique
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