Coulometry in Analytical Chemistry by G. W. C. Milner, G. M. Phillips and R. J. Magee (Auth.)

By G. W. C. Milner, G. M. Phillips and R. J. Magee (Auth.)

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The change in potential drop across the cell on completion of the 58 EQUIPMENT FOR CONTROLLED-POTENTIAL COULOMETRY removal of copper indicates the end point, and the product of current and time give the quantity of electricity passed in the original controlled-potential electrolysis. Employed in this manner, much greater sensitivity is achieved, and quantities down to 0 -01 C can be measured to within 0 · 1 %. 2. Electrical and electromechanical integration Instrumental methods of integration have resulted from the inconvenience of chemical integrators and the critical conditions needed to achieve reliable results.

Therefore any variation in the anode current varies inversely the voltage that falls across R2, Ml9 cell, R9 (R12\ Rio and Rn. By this means the effects of any change in the cell resistance are compensated and the electrolysis current is stabilized. The circuit is capable of maintaining currents up to about 500 mA constant to within ± 0 · 05 %. c. supply voltage are compensated similarly. 6AS7 'V Rectifier circuits Ballast resistor and switching circuit o À' i S 90V y inconstant current Constant current FIG.

Voltage applied to the circuit. Therefore any variation in the anode current varies inversely the voltage that falls across R2, Ml9 cell, R9 (R12\ Rio and Rn. By this means the effects of any change in the cell resistance are compensated and the electrolysis current is stabilized. The circuit is capable of maintaining currents up to about 500 mA constant to within ± 0 · 05 %. c. supply voltage are compensated similarly. 6AS7 'V Rectifier circuits Ballast resistor and switching circuit o À' i S 90V y inconstant current Constant current FIG.

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