Determination of the Calcium in wine and must

Calcium levels at values of around 70 – 80 mg/L expose wines to tartaric instability. In this sense, the chemical analysis of calcium is very important to avoid the precipitation of calcium DL tartrate in the bottle. The precipitation of this salt is an increasingly frequent phenomenon due to an increase in the concentration of Ca²⁺ in the must following the now known phenomenon called “Climate change”. The testing of calcium in the must also assumes considerable importance in the treatment of the must with potassium DL tartrate (Oeno 42/2000) with which it is possible to reduce the calcium content in the must, thus significantly reducing the risk of tartaric instability of the future wine.

The Analyzers CDR WineLab^® for determining Calcium in Wine and Must

The system is supplied pre-calibrated and ready for use.
Results are expressed in accordance with the reference method.
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®
Analyses	Wine and Must: Alcohol by Volume Acetic acid (volatile acidity) Fermentable Sugars Total Acidity L-Lactic Acid L-Malic Acid Free sulfur dioxide Total sulfur dioxide Yeast Assimilable Nitrogen (YAN) Galacturonic Acid Calcium Copper Catechins Gluconic Acid Acetaldehyde (Ethanal) pH Total Polyphenols Index Glycerol Colour (tonality and intensity) Total Polyphenols (Folin Ciocalteu) Anthocyanins Extraction on Grapes Total Anthocyanins Polymerised Anthocyanins HCl Index Tannins
Simultaneous Sample Analyses	16
Multiple Analyses on a Sample

Method

Test type: End Point.
Time testing: one test 1.5 minutes.
Analysis sessions with multiple samples up to a maximum of 16 are possible.

Calibration Curve

The calibration curve was formed using wines and musts. The trend of the curve confirms an excellent linearity of the system over the entire measurement range.

 

Test Principle

Calcium ions react with the chromogen present in the reagent and generate coloured complexes whose absorbance measured at 580 nm is proportional to the concentration of the analyte present in the water sample.

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. *301105: 10 tests 

Code. *301100: 100 tests (10 packages of 10 tests)

The reagents have a shelf-life of 12 months.

Processing Sample

Centrifuge the sample before analysis with the appropriate centrifuge (code 222061). In case of CO_2, degas the sample with the ultrasonic bath (code 222062)

Measuring Range

Test	Measuring range	Resolution	Accuracy
Calcium	20 – 250 ppm	1 ppm	4 ppm

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