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CH3041
ELECTRON ACTIVITY
• By analogy with
ion activity we have
electron activity. (ae- ) pE = - log10{ae-}
electron activity. (ae- ) pE = - log10{ae-}
• pE is is a measure of the relative
tendency of a solution to accept or donate
electrons.
The pE scale is convenient (like pH).
The pE scale is convenient (like pH).
• A high electron activity
means a low pE.
• Water with high electron activity is
said to
be reducing eg anaerobic sewerage digester
be reducing eg anaerobic sewerage digester
Generally low oxygen concentration. anoxic
• Water with low
electron activity is said to
be oxidizing eg. chlorinated water (POOL)
be oxidizing eg. chlorinated water (POOL)
Generally high oxygen concentration. oxic
