Relation between the programmed and isothermal retention indices in chromatography
✍ Scribed by Said, A. S. ;Jarallah, A. M. ;Al-Ameeri, R. S.
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 383 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0935-6304
No coin nor oath required. For personal study only.
✦ Synopsis
Isothermal vs programmed indices Coefficient of index increase Equivalent isothermal temperature
Summary
A systematic approach was utilized to deduce the relation between the programmed and isothermal retention indices in chromatography. The relation was given in the form of a chart from which the equivalent isothermal temperature T, is plotted vsAT withIpastheparameter.AT isafunctionof boththeinlet and outlet temperatures during the temperature programmed run and T, is the temperature at which the isothermal index is equal to the programmed index I,.
📜 SIMILAR VOLUMES
Isothermal Kováts retention indices may be used in GC for identification purposes, but they are also useful in characterisation of stationary phases and for studying structural and physico-chemical properties of both the analyte and the stationary phase. They are currently reported as whole numbers
## Abstract Numerous reports have appeared on the determination of temperature programmed retention indexes in gas chromatography and although chromatographic variables should be completely consistent with published data if such indexes are to be of use, the reproduction of such rigorous parameters
For calculation of retention indices, retention data for the n-alkane reference series has to be measured. In most cases when we analyse samples having many components, it is not possible to mix the n-alkanes into the analysed sample. When we measured the retention times of n-alkanes from separate i
## Abstract A retention index (RI) database containing 250 volatile compounds was created on a polar stationary phase column and validated for food aroma characterisation. Precision of the retention indices (RIs) was assessed by performing replicated injections of a representative number of volatil
## Abstract Concrete is a porous material, that contains an alkaline solution, whose pore network enables mass transport from the exterior. The concrete as composite material is quasi an insulator when it is dry and presents relatively low resistivities, in the order of few kΩ cm when it is fully s