Anson equation

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In electrochemistry, the Anson equation defines the charge-time dependence for linear diffusion control in chronocoulometry.[1]

The Anson equation is written as:

Q = 2 n F A C D 1 / 2 π − 1 / 2 t 1 / 2 {\displaystyle Q=2nFACD^{1/2}\pi ^{-1/2}t^{1/2}}

where,

Q = charge in coulombs n = number of electrons (to reduce/oxidize one molecule of analyte) F = Faraday constant, 96485 C/mol A = area of the (planar) electrode in cm2 C = concentration in mol/cm3; D = diffusion coefficient in cm2/s t = time in s.

This is related to the Cottrell equation via integration with respect to time (t), and similarly implies that the electrode is planar.

• Voltammetry
• Electroanalytical methods
• Limiting current
• Cottrell equation