L1 /
8
CH3041
ELECTROANALYTICAL
Electroanalytical
techniques are common in
aqueous analytical chemistry as they are sensitive and often provide information on the species as well as the amounts present.
aqueous analytical chemistry as they are sensitive and often provide information on the species as well as the amounts present.
• Potentiometry
- the measurement of cell
voltages to extract chemical information.
Essentially zero current flow.
voltages to extract chemical information.
Essentially zero current flow.
Obey the Nernst equation E = Eo -RT/nF lnQ
eg. Ion Selective Electrodes (pH glass elect.)
eg. Ion Selective Electrodes (pH glass elect.)
• Amperometry
- the measurement of cell
current flow to extract chemical information.
The cell voltage is held fixed.
current flow to extract chemical information.
The cell voltage is held fixed.
eg.
DO probe (oxygen electrode)
