What is rh factor in chromatography

In introductory thin-layer or paper chromatography, Rf usually means retention factor. RH factor is a different term in other contexts and is likely a typo if the question concerns distances on a chromatogram. Confirm the original notation before interpreting it.

Meaning and context

Rf is commonly calculated as the distance traveled by the center of a spot divided by the distance traveled by the solvent front, both measured from the same origin line. The ratio is dimensionless.

Examples and usage

If the spot travels 3 cm and the solvent front 6 cm, Rf = 3/6 = 0.5. Measure along the direction of development and use the same origin for both distances.

What to check

An Rf value depends on the stationary phase, solvent system, sample, and conditions. Matching one value is not conclusive identification of an unknown. Compare under equivalent conditions and use additional evidence when identification matters.

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