capacitative and faradaic currents at low d.c potentials. The imperfect separation results from an increased cell resistance which is in turn due to the low concentration of supporting electrolyte. The shift in the position of the base line is a constant at any particular concentration of supporting electrolyte and therefore can be displaced back to the bottom of the chart by a base line compensation circuit, should it become desirable to do so. CONCLUSIONSThe use of square-wave, and by extrapolation, sine-wave polarography provides an excellent means of monitoring the effluent from an ion-exchange column. The scheme is capable of high sensitivity, and therefore can detect the presence of a particular ion well out on the extremities of the peak. The selectivity is excellent as is shown by Figure 9 where two different ions were detected even though they were both eluted at the same time. The fact that oxygen is not reduced reversibly eliminates the necessity for treating the effluent to remove dissolved oxygen before the solution enters the cell.The 15-hour run for the determination of cadmium illustrates the long-term stability or reliability of this system.
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