International Code of Oenological Practices

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Acidification by cation exchanger treatment

II. Acidification by cation exchanger treatment


Physical partial extraction of cations of the musts to increase titration acidity and actual acidity (decrease in pH). through a cation exchanger.


a)        Increase titration acidity and actual acidity (decrease in pH)

b)       Refer to the objectives in the general file II. Acidification


a)        The treatment will be performed using cation exchange resins regenerated in the acid cycle.

b)       The treatment must be limited to the elimination of excess cations

c)        To avoid the production of fractions of must, the treatment will be performed continuously, with in-line incorporation of the treated must into the original must.

d)       As an alternative, the resin could be directly introduced into the tank of must, in the quantities required, then separated by all appropriate technical methods.

e)       The acidification must be carried under condition that the initial acidity is not raised by more than 54 meq/L. When must and wine are acidified, the cumulative net increase must not exceed 54 meq/L

f)         All operations will be placed under the responsibility of an oenologist or qualified technician

g)        The resins shall comply with the prescriptions of the International Oenological Codex.

Recommendation of the OIV: