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Retention in field-flow fractionation is a result of a field-induced sample concentration in the vicinity of a channel wall. By splitting the channel flow at the exit, so that sample containing flow lines leave the channel at a different port than those free of sample, one may markedly enhance the detectability of a given sample. The enhancement is discussed for the cases of “ideal splitting,” where an obstacle inserted in the flow stream affects the split, and “nonideal splitting,” where the flow is caused to split at some level in the channel specified by the relative resistance to flow through the two outlets. The proposed increase in detector response through stream splitting is experimentally verified.
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Giddings et al. (1983) studied this question.
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