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Record number: 1, Textual support number: 1 DEF

[A factor] represented by a term in the van Deemter equation. It is the contribution to plate height that is due to molecules traveling along paths through the column and it depends on the particle size and geometry of the packing.  2, fiche 1, Anglais, - eddy%20diffusion%20term

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Eddy diffusion broadens the band when passing through the column and detected in the chromatography. This is due to the molecules of the sample traveling through the column along many different paths of different lengths. The shortest path is the front of the band and the longest path is located in the back of the band. This can be corrected if the band is broad and the column support is of small size and uniform. This effect may be described by the van Deemter equation. H=A+(B/u) +Cu. Where M is the flow rate, A is the eddy diffusion term, B/u is the longitudinal diffusion term and Cu is the mass-transfer rate term. The eddy diffusion is independent of the flow-rate and only is concerned by how the column was packed.  1, fiche 1, Anglais, - eddy%20diffusion%20term

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

Steady Gradient Mode. During steady gradient mode, specimens are subject to temperature gradients along the longitudinal axis. A constant gradient is maintained throughout the duration of the experiment. Experiments, including Marangoni convection, diffusion in metals and alloys, Soret transport in liquid diffusion, liquid film migration, and liquid phase sintering in a gradient would all be performed under steady gradient conditions.  1, fiche 2, Anglais, - Soret%20transport%20in%20liquid%20diffusion

Record number: 2, Textual support number: 1 OBS

Compare with "Soret effect" (q.v.), which is defined as the diffusion of material in solution due to a temperature gradient.  2, fiche 2, Anglais, - Soret%20transport%20in%20liquid%20diffusion

Fiche 2,  Justifications,  Français

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«Soret transport» peut être traduit par «transport avec effet Soret», «transport par thermodiffusion» ou encore «transport thermodiffusif». L'effet Soret, ou thermodiffusion est le transport d'une ou de plusieurs espèces chimiques en solution liquide (à noter que cet effet existe également dans les gaz et même les solides), sous l'influence d'un gradient de température. La diffusion pure, quant à elle, existe aussi en l'absence de gradient de température. [Renseignements obtenus du service de chimie physique de l'Université libre de Bruxelles.]  1, fiche 2, Français, - transport%20avec%20effet%20Soret%20en%20solution%20liquide

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

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... B-term (second term) of the van Deemter equation.  1, fiche 3, Anglais, - molecular%20diffusion%20term

Record number: 3, Textual support number: 1 OBS

Imponant in band broadening only at very low flow rates below the minimum plate height where the diffusion of individual solutes can occur in a longitudinal(lengthwise) direction on the column.  1, fiche 3, Anglais, - molecular%20diffusion%20term

Fiche 3,  Justifications,  Français

Fiche 3,  Justifications,  Espagnol

Fiche 4,  Justifications,  Anglais

Fiche 4,  Justifications,  Français

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"Longitudinal" = erreur. "Turbulent" = terme juste.  1, fiche 4, Français, - coefficient%20de%20diffusion%20turbulente

Record number: 4, Textual support number: 2 OBS

Cahier Enviroguide chlorate de sodium, chap. 5.  1, fiche 4, Français, - coefficient%20de%20diffusion%20turbulente

Fiche 4,  Justifications,  Espagnol