Abstract
Summary A commercially available lock-in amplifier (PAR Model 121) is utilized in the construction of an instrument suitable for fundamental harmonic a.c. polarography, phase-selective a.c. polarography, anddirect recording of total phase angle. Equations have been derived for calculation of the total phase angle from the magnitudes and phase angles of the capacitive andfaradaic currents. The analytical utility of phase-angle measurements was investigated for the Cd2+/Cd(Hg) system. Phase-angle recording appears to have no analytical advantages over phase-selective a.c. polarography.
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