RetentionIndex: Non-Isothermal Retention Index Calculation
Description
Determine the non-isothermal (temperature-programmed) gas chromatographic retention index of a target compound based on the retention times of adjacent n-alkanes.
Usage
RetentionIndex(n, target, preceding, following)
Arguments
n
the number of carbon atoms in the n-alkane eluting prior to the target compound.
target
the retention time of the target compound
preceding
the retention time of the n-alkane eluting prior to the target compound.
following
the retention time of the n-alkane eluting after the target compound.
Value
Details
The retention time units can be either seconds or minutes, but should be consistent. The n-alkanes eluting before and after the target compound should differ by one carbon atom. This equation does not apply to isothermal separations or when the n-alkane series contains only odd or even carbon atoms.
References
Van Den Dool H, Kratz PD, Journal of Chromatography, 1963, 11, 463-471.