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Charge effects in the sedimentation of polyelectrolytes

The theory for sedimentation of macromolecular polyelectrolytes in solutions of low‐ionic strength has been modified for the case of a supporting low molecular weight electrolyte possessing a partial specific volume close to unity. The final equations simplify greatly, allowing sedimentation data to be plotted in a linear fashion. These data then may be readily extrapolated to infinite dilution, yielding a value, So, simply related to size and shape. From the initial slope of such plots, the net charge on the macro‐molecular polyelectrolyte may be determined. It is suggested that tetramethyl‐ammonium chloride may prove to be a satisfactory supporting electrolyte for such studies.