TERMIUM Plus^®

Record 1,  Textual support,  English

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, record 1, English, - eddy%20diffusion%20term

Record number: 1, Textual support number: 1 CONT

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, record 1, English, - eddy%20diffusion%20term

Record 1,  Textual support,  French

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 OBS

The process of solute movement into and out of the stationary phase or mobile phase. It is represented by the C term of the van Deemter equation and is referred to as the mass transfer term. The faster the process of mass transfer, the better the efficiency of the column. In HPLC, mass transfer is the most important factor affecting column efficiency. It is increased by the use of small particle packings, thin layers of stationary phase, low viscosity mobile phases, and high temperatures.  3, record 2, English, - mass%20transfer%20term

Record 2,  Textual support,  French

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

An equation which relates the plate height with the many variables associated with the flow of the carrier gas through the stationary phase.  1, record 3, English, - Van%20Deemter%20equation

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 OBS

L'équation dite de Van Deemter représente la fonction [...] dans laquelle les termes constants vont permettre, en les minimisant, de connaître les meilleures conditions opératoires pour que l'efficacité soit aussi élevée que possible.  2, record 3, French, - %C3%A9quation%20de%20van%20Deemter

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

... B-term(second term) of the van Deemter equation.  1, record 4, English, - molecular%20diffusion%20term

Record number: 4, 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, record 4, English, - molecular%20diffusion%20term

Record 4,  Textual support,  French

Record 4,  Textual support,  Spanish