Determination of Total Sulfur Dioxide in cider
With CDR CiderLab is possible to determine the Total Sulfur Dioxide (SO₂) in cider in 1 minute with a simple photometric reading using the cider as is without having to resort to the distillation according with the reference method or to the iodometric titration according with the simplified method. Calibration is not necessary.
Method
Test Principle
The total sulfur dioxide contained in a cider or must is made to reacts with an organic disulphide in order to form a colored compound, whose intensity, measured at 420 nm in end-point, is directly proportional to the concentration of total sulfur dioxide in the sample.
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Definition and scope of the test
Sulfur dioxide (SO2) is used in oenology mainly as preservative, but also for other purposes (for example for antiseptic, antioxidant, antioxidasic, solubilizing, combining and clarifying functions). Part of the SO2 that is added as potassium metabisulfite to juice and ciders undergoes a series of reactions. Therefore, after a short period of time, most of the sulfur dioxide reacts with some of the substances present, binds with them and forms addition compounds (combined sulfur dioxide) that are unable to express the typical properties of unbound molecules. Therefore, only the part that does not combine (free sulfur dioxide) plays an important role in preserving cider from oxidizing alterations and from some micro-organisms.
This test can be used to determine the total content of SO2 in cider, which is the sum of the free and combined sulfur dioxide fractions.
Calibration Curve
The calibration curve of CDR CiderLab, obtained using reference methods.
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Reagent test Kits
Measuring range
| Analyses | Measuring range | Resolution | Repeatability |
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The Analyzers for process and quality control in cider production
CDR CiderLab
- Complete analysis panel, supplied already configured
- Up to 16 determinations simultaneously
- Possibility of carrying out analyses of the same sample
- Integrated printer
- Full connections (LAN - USB - Bluetooth barcode/QR code reader)
CDR CiderLab Jr
- Partial analysis panel, supplied configured with 3 analyses of your choice, implementable
- Up to 3 determinations simultaneously
- Wireless connection to external printer
- USB connections