Polarograph with Direct Recording of Electrode Potential

The development of polarography and polarographic instruments

“…One can readily calculate that with a resistance of 10,000 ohms and a current of 1 Fa one would have to correct the applied voltage by 10 mv for the IR drop across the resistor. Saayer, Pecsok, and Jensen (17) and others have shown that the use of a third electrode can provide automatic correction for the I R drop in the circuit. They have constructed an apparatus that plots directly the electrode potential, rather than the applied voltage against the current.…”

Automatic Operations

“…Their applications included cadmium, copper, lead, and fumaric and maleic acids. Sawyer et al (227) devised a compact and versatile polarograph utilizing an X-Y recorder for the direct measurement of the electrode potential or applied voltage and a third electrode providing for automatic correction of the IR drop in the cell, hence presenting the record in a convenient and easily catalogued form.…”

Controlled-Potential and Derivative Polarograph

“…Several approaches to the problems caused by the iR cell and the salt bridge potential errors in regular polarography have been reported (1,11,17,21). Of these methods, the most interesting is the use, first reported by Paul Arthur, of an X-Y recorder to plot the polarographic current vs. the corresponding value of the effective potential 'of the dropping mercury electrode.…”