Splitless Injection Purge Time
This graph shows the different vaporization rates of hydrocarbons during a splitless injection. The volatile hydrocarbons vaporize rapidly compared to the semi- volatile ones. At 0.25min (15sec.) the volatile and semi- volatile components of the sample have almost finished vaporizing. But the non- volatile C36 and C42 have yet to reach half their final peak area. At this point there is the most discrimination between the hydrocarbons in the sample. From 1/ 4 of a minute to one minute the areas of C8 to C30 don’t change much but C36 and 42 gain enough energy to more than double their area. A purge on time of one minute is usually sufficient to get good recoveries for C8 to C36.
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