RESOLUTION OIV-OENO 554-2015

UPDATE TO THE MONOGRAPH ON OENOLOGICAL TANNINS– SPECIFICATION FOR IRON

The General Assembly,

IN VIEW OF Article 2, paragraph 2 iv of the Agreement of April 3, 2001 establishing the International Organisation of Vine and Wine,

CONSIDERING the work of the “Specifications of Oenological Products” Expert Group,

DECIDES, following a proposal made by Commission II “Oenology”, to modify the file Oeno 12/2002 modified by Oeno 5/2008 and 6/2008, as well as by OIV-Oeno 352-2009, of the International Oenological Codex as follows:

To the paragraph 6.6 Iron, the sentences in italic are added. The paragraph is modified as follows:

• 6.6 Iron

Add 2 ml of 5% potassium thiocyanate solution (R) and 1 ml of concentrated hydrochloric acid (R) to 10 ml of test solution prepared according to article 6.4. The resulting colour should not be more intense than the control sample prepared with 2ml of iron (III) salt solution at 0.010 g of iron per litre (R), 8 ml of water and the same volumes of the same reagents. If this is not the case, dilution of the test solution is required.

The iron content must be less than 50 mg/kg, with the exception of the iron content of chestnut-derived tannins, which should be less than or equal to 200 mg/kg and in which case, the test solution prepared according to 6.4 should be diluted as appropriate. It is also possible to measure the iron with the atomic absorption spectrometer.