Glossary Of HPLC-LC Separation Terms – U

The listing should be helpful to those just starting in HPLC but it also can serve as a refresher for long-time users in the field.


u: See linear velocity and velocity.

u e See interstitial velocity.

u M See mobile-phase velocity.

u s See superficial velocity.

u z See zone velocity.

UHPLC: Refers to ultrahigh-pressure liquid chromatography; often loosely used for any separation performed over the pressures of conventional pumps (400 bar); original meaning was for separations in the 20,000 psi+ range.


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