Utilizza questo identificativo per citare o creare un link a questo documento:
|Titolo:||Activated aluminum oxide selectively retaining long chain n-alkanes. Part I, description of the retention properties|
|Autori interni:||FIORINI, Dennis|
|Data di pubblicazione:||2009|
|Rivista:||ANALYTICA CHIMICA ACTA|
|Abstract:||Aluminum oxide activated by heating to 350–400 ◦C retains n-alkanes with more than about 20 carbon atoms, whereas iso-alkanes largely pass the column non-retained. Retention of n-alkanes is strong with n-pentane or n-hexane as mobile phase, but weak or negligible with cyclohexane or iso-octane. It is strongly reduced with increasing column temperature. Even small amounts of polar components, such as modifiers or impurities in the mobile phase, cause the retention of n-alkanes to irreversibly collapse. Since n-alkanes are not more polar than iso-alkanes and long chain n-alkanes not more polar than those of shorter chains, retention by a mechanism based on steric properties is assumed. The sensitivity to deactivation by polar components indicates that polar components and n-alkanes are retained by the same sites. The capacity for retaining n-alkanes is low, with the effect that the retention of n-alkanes depends on the load with retained paraffins. These retention properties are useful for the pre-separation of hydrocarbons in the context of the analysis of mineral oil paraffins in foodstuffs and tissue, where plant n-alkanes, typically ranging from C23 to C33, may severely disturb the analysis (subject of Part II).|
|Appare nelle tipologie:||Articolo|
File in questo prodotto:
Non ci sono file associati a questo prodotto.
- PubMed Central loading...
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.