Chronoamperometry (CA)

Chronoamperometry (CA) or Amperiometric Detection is a simple, widely used electrochemical measurement technique. Many sensors, like those for glucose or oxygen, require this technique. The instrument applies a constant DC-potential (E dc) and the current is measured with constant interval times. The result is displayed in real time.

Signal applied during Chronoamperometry

Measuring

Chronoamperometry is widely utilized in many applications, including highly sensitive electrochemical sensors (e.g., glucose biosensors), corrosion studies for assessing materials’ resistance, as well as basic electrochemistry applications like studying electrode kinetics and reaction mechanisms, and electrodeposition processes for precise coating control in industries such as electronics, automotive, and aerospace.

The technique is also applied when electrochemical detection is used with a flow cell or flow injection cell (FIA). While batch measurements result in current levels, which depend on the concentration, a FIA setup shows peaks in the current.

Cottrell plot

For more information about showing a Cottrell plot, see Cottrell equation.