Electrochemical detection applying a constant potential to the working electrode. Measured current from oxidation or reduction is proportional to the sample concentration. Very selective and sensitive method. Works with electrode reactions not changing the electrode surface (e.g. cyanide, nitrite, thiosulfate, phenols ...). Only approx. 10% of the analyte is oxidized or reduced. May be used stand-alone as well as in series or parallel to other detectors.