Planar electrochromatography

Journal of Chromatography. a
David Nurok

Abstract

Recent developments in planar electrochromatography (PEC) in both the normal-phase and the reversed-phase modes, and at both atmospheric and elevated pressure, are reviewed. Other forced-flow techniques in planar chromatography are also briefly covered. Mobile phase migration in PEC is primarily due to electroosmotic flow, which is controlled by the applied electric field. Capillary mediated flow is an important secondary contributor to migration, and occurs because the layer is unsaturated as a consequence of liquid evaporating from the layer due to Joule heating. The magnitude of the electric field and the concentration of ions in solution are important variables that control both electroosmotic flow and Joule heating. Separations are faster and more efficient than those obtained by conventional planar chromatography, provided appropriate experimental conditions are selected. With inappropriate conditions, either mobile phase accumulates on the surface of the sorbent layer, or Joule heating causes excessive evaporation. The former results in poor spot shape, and the latter can cause the layer to dry. Good separations are obtained when there is a balance between these two effects. The problems associated with mobile phase accu...Continue Reading

References

Jan 12, 2001·Journal of Chromatography. a·D NurokD M Chenoweth
Feb 6, 2003·Journal of Chromatography. a·David NurokMatthew A Carmichael
Mar 17, 2004·Analytical Chemistry·David NurokRandall W Replogle

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Citations

Apr 9, 2008·Analytical and Bioanalytical Chemistry·Tadeusz H DzidoAneta Hałka
Apr 13, 2011·Journal of Chromatography. a·Tadeusz H DzidoBeata Polak
Jul 9, 2009·Journal of Separation Science·Pingli WangYukui Zhang
Dec 6, 2005·Journal of Chromatography. a·Peter A Tate, John G Dorsey
Jul 26, 2005·Journal of Chromatography. a·Peter A Tate, John G Dorsey
Oct 23, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Sergio MendezGabriel P López
Apr 18, 2006·Analytical Chemistry·Allyson L NovotnyRobert E Santini
Feb 15, 2017·Analytical Chemistry·Niall P MacdonaldBrett Paull
Jul 1, 2006·Analytical Chemistry·Tadeusz H DzidoPiotr Slazak
Jun 15, 2006·Analytical Chemistry·Joseph Sherma

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