Dissolved oxygen, amperometry

Clark electrode One that measures the activity of dissolved oxygen by amperometry. 

P. Maitoza and D. C. Johnson, Detection of Metal Ions Without Interference from Dissolved Oxygen by Reverse Pulse Amperometry in Flow Injection Systems and Liquid Chromatography. Anal. Chim. Acta, 118 (1980) 233. 

C iark electrode One that measures dissolved oxygen by amperometry. co-chroniatography In chromatography, addition of a known compound to an unknown to see if it is eluted at the same time as a component of the unknown. See spike. 

An amperometric technique relies on the current passing through a polarizable electrode. The magnitude of the current is in direct proportion to the concentration of the electroanalyte, with the most common amperometric techniques being polarography and voltammetry. The apparatus needed for amperometric measurement tends to be more expensive than those used for potentiometric measurements alone. It should also be noted that amperometric measurements can be overly sensitive to impurities such as gaseous oxygen dissolved in the solution, and to capacitance effects at the electrode. Nevertheless, amperometry is a much more versatile tool than potentiometry. 

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