What is e1/2 cyclic voltammetry?
For reversible system E1/2 is mean of anodic and cathodic peak potential..But for irreversible system E1/2 is the potential at which value of current is half of the peak current.
What does half wave potential mean?
Half-wave potential (E1/2) is a potential at which polarographic wave current is equal to one half of diffusion current (id). In a given supporting electrolyte, the half-wave potential is unique for each element and its different valence states and chemical forms.
What is meant by polarography?
Polarography is a specific type of measurement that falls into the general category of linear-sweep voltammetry where the electrode potential is altered in a linear fashion from the initial potential to the final potential. potential response of a polarographic experiment has the typical sigmoidal shape.
What is limiting current in polarography?
The limiting current is the sum of the residual and the diffusion currents. The residual current is subtracted from the limiting current to give the wave height. When the current is measured only at the end of the drop life, the technique is termed sampled dc polarography.
What is polarography in pharmaceutical analysis?
POLAROGRAPHY. – an electromechanical technique of analyzing solutions that measures the current flowing between two electrodes in the solution as well as the gradually increasing applied voltage to determine respectively the concentration of a solute and its nature. -created by: Jaroslav Heyrovsky. Page 3. POLAROGRAPHY.
What is application of polarography?
Polarography has been used extensively to determine trace metals in pharmaceutical products and to estimate drugs that contain metals as a constituent. If the organic matter is reduced at the same or at a lower potential than that of the metal a preliminary chemical separation or ashing procedure must be undertaken.
What is DC polarography?
The DC polarography (DCP) is a physico-chemical technique, based on recording and measurement of cur- rent-voltage curves, obtained with a dropping mercury electrode. The quantities measured most frequently on such current-voltage curves are limiting currents and half- wave potentials.