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In this study, resonance light scattering (RLS) is demonstrated as a detection methodology for real-time visualization of the electrical field-flow fractionation process. On-column RLS was used to monitor the fractionation of a bolus sample containing 40-, 60-, and 80-nm-diameter RLS Particles into individual particles and bands of particles. Optical detection using the RLS system was correlated to an on-chip electrical conductivity detector. Particle concentrations as low as 1.08×10-12 M (1 RLS Particle/1.54 pL) were detected using both the optical and electrical detection systems.