HI-84500-61 Alkaline Reagent for Sulphur Dioxide Mini Titrator for wine analysis, 120mL

This alkaline reagent is used to raise the pH value of the sample prior to performing a total sulphur dioxide titration. With 5 mL of reagent required per total SO₂ test, there is enough alkaline reagent for approximate 24 tests.

Alkaline Reagent for HI-84500-02 mini titrator for wine analysis.

The HI-84500-61 alkaline reagent is necessary for the analysis of total sulphur dioxide. The alkaline reagent raises the pH and liberates bound sulphur dioxide. This pH adjustment ensures that all of the free and bound sulphur dioxide is accounted for to give an accurate measurement of total sulphur dioxide. The HI-3148B ORP electrode is used to detect the endpoint for both the low (1.0 to 40.0 ppm of SO₂) and high (30 to 400 ppm of SO₂) ranges. The HI-84500 can be used with all wines, including red, which are difficult to test using traditional methods due to the difficulty to observe a distinctive colour change when the endpoint is reached.

The HI-84500 determines the free and total sulphur dioxide concentration in wine using the Ripper method. Excess iodide is added to the wine sample and reacts with the iodate titrant to produce iodine:

IO₃- + 5I- + 6H+ → 3I₂ + 3H₂O

The iodine produced reacts with sulphur dioxide in the wine according to the redox reaction below:

H₂SO₃ + I₂ → H₂SO₄ + 2HI