SCIENCE|natural and applied sciences|physical sciences|chemistry
- fachtóir coinneála Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
- ga
- Retentionsfaktor | Kapazitätsverhältnis | k | Massenverteilungsverhältnis | Kapazitätsfaktor
- de
- Definition Maß für die Zeit, die sich die Probe an/in der stationären Phase aufhält, bezogen auf die Aufenthaltszeit in der mobilen Phase Reference "Engelhardt H., Rohrschneider L. (Bearbeiter), ""Deutsche chromatographische Grundbegriffe zur IUPAC-Nomenklatur"", Gesellschaft Deutscher Chemiker, Fachgruppe Analytische Chemie, Arbeitskreis Chromatographie, ca. 1999, S. 22, http://www.uni-saarland.de/fak8/huber/pdf/CHROBEGR97.pdf (17.08.2010)"
- Comment "Der Retentionsfaktor gibt an, um wie viel länger sich die Probe an der stationären Phase aufhält als in der mobilen Phase.Quelle: Engelhardt H., Rohrschneider L. (Bearbeiter), ""Deutsche chromatographische Grundbegriffe zur IUPAC-Nomenklatur"", Gesellschaft Deutscher Chemiker, Fachgruppe Analytische Chemie, Arbeitskreis Chromatographie, ca. 1999, S. 22, http://www.uni-saarland.de/fak8/huber/pdf/CHROBEGR97.pdf (17.08.2010)."
- capacity factor | capacity ratio | retention factor
- en
- Definition "a measure of the time the sample component resides in the stationary phase [ IATE:3508648 ] relative to the time it resides in the mobile phase [ IATE:2147382 ] ; it expresses how much longer a sample component is retarded by the stationary phase than it would take to travel through the column with the velocity of the mobile phase" Reference "IUPAC. Compendium of Chemical Terminology, 2nd ed. (the ""Gold Book""). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8 http://goldbook.iupac.org/R05359.html [6.8.2010]"
- Comment Mathematically, it is the ratio of the adjusted retention volume (time) and the hold-up volume (time). If the distribution constant is independent of sample component concentration, then the retention factor is also equal to the ratio of the amounts of a sample component in the stationary and mobile phases respectively, at equilibriumIn former nomenclatures and in the literature one may find the expressions partition ratio, capacity ratio, capacity factor or mass distribution ratio to describe this term. In the literature the symbol k' is often used for the retention factor, particularly in liquid chromatography. The original reason for this was to clearly distinguish it from the partition coefficient (distribution constant) for which the symbol K had been utilized. Since, however, the distribution constants are all identified with a subscript, there is no reason to add the prime sign to this symbol. It should be emphasized that all the recognized nomenclatures (IUPAC, BS, ASTM) have always clearly identified the capacity factor with the symbol k and not k'. The logarithm of the retention factor is equivalent to the RM value used in planar chromatography.