Determination of pH in wine
With CDR WineLab® is possible to determine pH in wine with a colorimetric method whose results are correlated to the results of the OIV method which is based on an electrochemical measuring.
CDR WineLab® method, that does not require the use of any probe, does not need maintenance or calibration.
The Analyzers CDR WineLab® for determining pH in Wine and Must
The system is supplied pre-calibrated and ready for use.
Results are expressed in accordance with the reference method.
It is also possible to standardize the system using samples with a known titration.
The reagents have a shelf-life untill 18 months
The analytical methods are simple: the system does not require an equipped laboratory or skilled staff.
 CDR WINELAB® |
 CDR WINELAB® JUNIOR |
|
|---|---|---|
| Analyses | Wine and Must: Acetic acid (volatile acidity) Fermentable Sugars Total Acidity L-Lactic Acid L-Malic Acid Free sulfur dioxide Total sulfur dioxide Alcohol by Volume Yeast Assimilable Nitrogen (YAN) Gluconic Acid Acetaldehyde (Ethanal) pH Total Polyphenols Index Glycerol Colour (tonality and intensity) Total Polyphenols Total Anthocyanins Polymerised Anthocyanins HCl Index Tannins Catechins Copper |
Configuration with tailored panel of analyses |
| Simultaneous Sample Analyses | 16 | 3 |
| Multiple Analyses on a Sample |  |
– |
Method
Test type: End Point.
Time testing: one test 1 minute – 80 Test/Hour.
Are possible test sessions with several samples, up to a maximum of 16.
Calibration curve
The calibration curve of CDR WineLab® for determination of pH in wine, obtained using reference methods, confirms the excellent linearity of the system over the whole testing range.
Reagent test Kits
The reagents are packaged in foil pouches containing 10 tubes useful to perform 10 analyses.
This is the minimum package that allows the use of CDR systems even to those who need to make a few analyses, thus not wasting reagents.
There are also boxes of 100 tests, however, packaged in 10 bags of 10 tubes containing the reagent.
Code. *300310 : 10 tests
Code. *300305: 100 tests (10 packages of 10 tests)
The reagents have a shelf-life of 6 months
Test Principle
pH measures the dissociation grade of acids present in wine. This parameter influences the vinification and conservation of wine. The range of pH value is approximately 3.00 – 4.00. There is not any legal limit.
pH is determined through acid-base colorimetric reaction in which a phenol derivative, for addition of wine, undergoes a decoloration. The entity of this decoloration, measured at 630nm, is correlated to pH in the sample.
Processing – Sample Volume – Measuring Range
Wine: use as is.
| Test | Measuring range (pH) |
Resolution (g/L of acetic acid) |
Repeatability |
|---|---|---|---|
| pH | 3,00 – 4,00 | 0,01 | 0,02 |
