How to test for so2 in a tannic red wine?
I have a box of Titrets to test for so2 but after reading further both my book (Techniques in Home Winemaking) and the instructions both state "This test kit is not recommended for use with red wines or white wines containing ascorbic acid or tannin. These wines often give false high test results. As a rule, a test result of greater than 40 ppm free sulfite for any wine should be considered suspect and an alternative sulfite determination method should be employed."
The book goes on to say that all kits have the same interference problem from ascorbic acid, but it doesn't mention about tannins.
Is that alternative method they are referring to the Aeration-Oxidation (AO) method?
I just want a fool proof method (if there is one) for testing for so2, and the easier the better. But if the AO method is the only way than so be it.
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