Abstract
A novel ultrafiltration device is described. It consists of a vertical dialysis cell in which the semipermeable membrane is supported by a metal or plastic porous, rigid sheet. The dialysis cell is mounted in a centrifuge swinging bucket, or rotor hole, with the membrane parallel to the centrifuge radius. Experiments are performed by filling one dialysis cell compartment with the liquid sample to be treated and by spinning it in a centrifuge. Effluent is collected from the other (initially empty) compartment of the dialysis cell. Membranes used in these cells have similar permeabilities but better retention than those used in unstirred ultrafiltration cells for small filtrate volumes.