Polarography and Voltammetric Analysis:

1. (i) Sketch a typical polarogram. Label the axes clearly. (ii) Indicate in your sketch the physical quantities that can be obtained for qualitative and quantitative analyses, respectively.
2. (i) Why is a microelectrode used in voltammetry?

(ii) Why is this method limited by very positive and negative applied potentials?

3. In differential-pulse technique, (i) sketch the excitation signal by showing the change of applied potential as a function of time and (ii) explain why a higher sensitivity is obtained.
4. In hydrodynamic voltammetry, the cuirent is found to be depending on the analyte concentration. Explain how to obtain this relationship by considering the transport of analyte to the electrode surface.
5. The enzyme-based voltammetric sensor is employed for measuring the glucose content in blood serum. Describe briefly the construction of the sensor and how the concentration of glucose is determined.