Fractionating Power in Sedimentation Field-Flow Fractionation with Linear and Parabolic Field Decay Programming

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Abstract
Following an earlier treatment of exponentially programmed field decay in field-flow fractionation (FFF), expressions have been derived for retention time and fractionating power Fdfor linear and two types of parabolic programmed field decay. The particular case of sedimentation FFF has been considered and plots of both retention time and Fdas functions of particle diameter are generated by computer in order to illustrate the influence of the various experimental parameters. Approximate analytical expressions have been derived for retention time and Fd in each case, and from these the means of calculating both the initial field strength and the program time necessary to obtain a desired level of Fd at some particular particle size have been obtained. Finally the special properties and possible uses of these programs have been discussed.