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- Posts: 4
- Joined: Sat Mar 05, 2022 6:00 pm
When we have a carrier gas we also know its optimal linear velocity e.g. hydrogen has an optimal velocity near 35cm/s. Theoretically, would this be calculated using the square root of B/C in the van deemter equation?
As for the analyte, I believe it also has its own optimal velocity by taking the square root of B/C. And this value would be different from the carrier gas' optimum velocity. So why is it that we tend to say that hydrogen or helium are preferred over nitrogen as it has a higher optimum velocity?
Essentially, why should we even be bothered by the carrier gas' optimum velocity? Shouldn't we just set the velocity based on the analyte's optimum velocity? I don't quite understand the purpose of having to consider the optimum velocity for the carrier gas.
Thanks in advance for the help!