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The theoretically predicted inverse relationship between the retention parameter λ for electrical field-flow fractionation (FFF) and a sample's particle diameter d is verified experimentally using colloids of well-characterized size and electrophoretic mobility. From observed retentions of these samples, it is possible to experimentally determine the magnitude of the effective field operating in the channel at any particular time. Even minor amounts of adsorbed nonionic polymer are shown to significantly reduce the retention of a polystyrene carrier particle, indicating that retention in electrical FFF might be a sensitive reflection of changes in surface composition for colloidal materials. With knowledge of the effective field, an observed retention is shown to provide information regarding a sample's electrophoretic mobility, provided outside size information can be obtained.
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Dunkel et al. (1997) studied this question.
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