3. Polarography is a particular type of voltammetry in which the microelectrode is a dropping mercury electrode. a) List

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3 Polarography Is A Particular Type Of Voltammetry In Which The Microelectrode Is A Dropping Mercury Electrode A List 1 (57.49 KiB) Viewed 30 times

3. Polarography is a particular type of voltammetry in which the microelectrode is a dropping mercury electrode. a) List two advantages and two disadvantages of a dropping mercury electrode as compared with platinum and carbon electrodes. b) Briefly explain the mass transport process of a polarography method. 10 μA c) Polarogram below was obtained for a 10-mL lead-containing sample. The limiting current increased (to B) after the addition of 100µL of a 0.10-M lead standard to the 10-mL sample. Given that the sample lead ion yielded a limiting current of 13μA (A). The current increases by 8.5µA on spiking the sample with a 1-mM lead standard (considering the 1: 100 fold dilution; B-A). Calculate the original lead concentration in the sample. -0.4 -0.8 (4 marks) B A (4 marks) E (V)