Abstract
A method for the simultaneous determination of CO2 and free SO2 in wines based on the use of a continuous arrangement coupled to both a pervaporator and in series arranged potentiometric and photometric detectors is proposed. After pervaporation, both analytes give one common potentiometric signal and then the free SO2 is photometrically determined via the colored compound formed with p-rosaniline and formaldehyde. The CO2 content is determined by difference. The range of the method is linear between 2.0 and 20.0 mg/L for free SO2 and 50.0 and 600.0 mg/L for CO2, with a precision, expressed as relative standard deviation, of 7% in both cases. The method was applied to different Spanish wines and the results compare well with those obtained by the corresponding official methods.
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