Theoretical Study of Permselective Layers on Amperometric Electrodes in Flowing Streams

William Breen; John F. Cassidy; Michael E.G. Lyons

doi:10.1021/ac00020a013

Theoretical Study of Permselective Layers on Amperometric Electrodes in Flowing Streams

William Breen, John F. Cassidy, Michael E.G. Lyons

Research output: Contribution to journal › Article › peer-review

Abstract

A model consisting of the response of a porous permselective coating on an electrode in an amperometric configuration is solved for two types of concentration profile Impinging on the polymer solution Interface. A Gaussian concentration profile and a Poisson concentration profile are examined, since both profiles typically arise in both flow injection analysis (FIA) and high-performance liquid chromatography (HPLC). Analytical expressions for current and for concentration profiles within the layer are derived. Working curves are presented that allow estimation of peak height decrease, peak broadening, lag time, and diffusional tailing due to coating the amperometric detector with a permselective layer. It is possible by using these equations and working curves to estimate the diffusion coefficient of substrate through the layer and to design layers which minimize lag time and peak tailing and optimize peak height.

Original language	English
Pages (from-to)	2263-2268
Number of pages	6
Journal	Analytical Chemistry
Volume	63
Issue number	20
DOIs	https://doi.org/10.1021/ac00020a013
Publication status	Published - 1 Oct 1991

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title = "Theoretical Study of Permselective Layers on Amperometric Electrodes in Flowing Streams",

abstract = "A model consisting of the response of a porous permselective coating on an electrode in an amperometric configuration is solved for two types of concentration profile Impinging on the polymer solution Interface. A Gaussian concentration profile and a Poisson concentration profile are examined, since both profiles typically arise in both flow injection analysis (FIA) and high-performance liquid chromatography (HPLC). Analytical expressions for current and for concentration profiles within the layer are derived. Working curves are presented that allow estimation of peak height decrease, peak broadening, lag time, and diffusional tailing due to coating the amperometric detector with a permselective layer. It is possible by using these equations and working curves to estimate the diffusion coefficient of substrate through the layer and to design layers which minimize lag time and peak tailing and optimize peak height.",

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year = "1991",

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AU - Breen, William

AU - Cassidy, John F.

AU - Lyons, Michael E.G.

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N2 - A model consisting of the response of a porous permselective coating on an electrode in an amperometric configuration is solved for two types of concentration profile Impinging on the polymer solution Interface. A Gaussian concentration profile and a Poisson concentration profile are examined, since both profiles typically arise in both flow injection analysis (FIA) and high-performance liquid chromatography (HPLC). Analytical expressions for current and for concentration profiles within the layer are derived. Working curves are presented that allow estimation of peak height decrease, peak broadening, lag time, and diffusional tailing due to coating the amperometric detector with a permselective layer. It is possible by using these equations and working curves to estimate the diffusion coefficient of substrate through the layer and to design layers which minimize lag time and peak tailing and optimize peak height.

AB - A model consisting of the response of a porous permselective coating on an electrode in an amperometric configuration is solved for two types of concentration profile Impinging on the polymer solution Interface. A Gaussian concentration profile and a Poisson concentration profile are examined, since both profiles typically arise in both flow injection analysis (FIA) and high-performance liquid chromatography (HPLC). Analytical expressions for current and for concentration profiles within the layer are derived. Working curves are presented that allow estimation of peak height decrease, peak broadening, lag time, and diffusional tailing due to coating the amperometric detector with a permselective layer. It is possible by using these equations and working curves to estimate the diffusion coefficient of substrate through the layer and to design layers which minimize lag time and peak tailing and optimize peak height.

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Theoretical Study of Permselective Layers on Amperometric Electrodes in Flowing Streams

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