7. Electroanalytical techniques 1

Electroanalytical chemistry

Analytical chemistry that uses electrochemical methods for quantitative determination of analyte concentrations in different samples.

Electroanalytical chemistry utilizes ....

the ability of the analytes to accept or donate electrons and ions to carry electrical charge.

The faradaic current (IF) is directly proportional ...

to the concentration of electroactive species (=analyte) in solution

The measured total current (I ) contains also a

capacitive charging current (IC).

In electrochemical analysis, the contribution from the capacitive current

should be eliminated or minimized.

Voltammetric analysis is carried out in a...

voltage interval where the analyte (= chemical species) undergo a redox reaction.

In electrochemical analysis what should be as small as possible?

The background current (capacitive)

What can be eliminated by adding N2 to the solution

oxygen gas at the working electrode

During each cathodic pulse, (in square wave voltammetry) the analyte is....

reduced at the electrode surface and reoxidized during the anodic pulse.

The two currents in SWV have opposite signs, their difference is ...

larger than either current alone (= if you would only apply the staircase shaped potential)

Amperometry

is detection of ions in a solution based on electric current or changes in electric current.