System and method for monitoring sulfite

A sulfite monitoring device configured for insertion into a vessel containing wine, comprising:

• an elongated probe body dimensioned to extend through an opening of the vessel and into wine contained therein;
• a sealing structure configured to engage the opening of the vessel;
• an electrochemical cell disposed within the probe body and comprising a working electrode, a reference electrode, and a counter electrode exposed to the wine;
• a potentiostat configured to apply a cyclic voltage waveform to the working electrode relative to the reference electrode and measure current between the working electrode and the counter electrode;
• and
• a processor configured to:
• acquire a first cyclic voltammogram at a first time and a second cyclic voltammogram at a second time while the probe body remains inserted in the vessel,
• generate a difference signal according to ΔI(V)=I2(V)−I1(V),
• generate a derivative of the difference signal with respect to applied potential,
• extract, from the derivative within a selected oxidation potential window, a feature representation corresponding to electrochemical change between the first time and the second time,
• apply dimensionality reduction to the feature representation to generate a reduced feature vector,
• evaluate the reduced feature vector using a classifier configured to determine whether a sulfite concentration variation has occurred, and
• in response to the classifier determination:
• detect a sulfite dosing event when a sulfite concentration variation is determined, and
• automatically adjust a calibration parameter when no sulfite concentration variation is determined and a baseline shift is detected.