mass (weight) of the stationary phase, Ws

in chromatography
https://doi.org/10.1351/goldbook.M03727
The mass (
weight
) of the liquid stationary phase or the
active solid
in the column. The mass (
weight
) of any solid support is not included. In the case of
partition chromatography
with a liquid stationary phase it is identical to the liquid phase mass (
weight
).
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 833 [Terms] [Paper]