Instruction Manual Mi455 FREE & TOTAL SULPHUR DIOXIDE Minititrator for wine analysis
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PRINCIPLE OF OPERATION
Determination of sulphur dioxide in wine samples is made by titration of the sulphur
dioxide present in wine with iodate. In this procedure an excess of iodine is added to the
wine sample and it is titrated with iodate.
For precise results it is very important to know the exact sample volume, titrant volume and
concentration.
The peristaltic pump has a good repeatability but the dosing volume depends on many
factors as the diameter of the tube or the tube stretching. To compensate for all this errors,
the pump need to be calibrated. The calibration of the pump is also needed in order to have
high precision of the titrations.
The calibration procedure is in fact the analysis of a known solution. By doing this, the
instrument makes a differential analysis between the standard and the wine sample. The
pump volumetric debit and the real concentration of the titrant is compensated. Only the
sample volume has to be precisely known.
