Retention Index(Isothermal)
If a logarithm of adjusted retention times or relative retentions of n-alkanes is plotted with carbon numbers for isothermal analysis, they will show linear relation. Adding a logarithm of adjusted retention time of an unknown to the above~mentioned graph indicates how many carbon numbers this compound corresponds to. In general, 100 times of a carbon number is defined as the retention index.
![Retention Index(Isothermal)](/an/sites/shimadzu.com.an/files/d7/ckeditor/an/support/gcms/03_15.gif)
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