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

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.