MANTECH INC. 160 Southgate Drive, Unit 2 Guelph, Ontario, Canada N1G 4P5 P: (519) 763-4245 www.mantech-inc.com Total Acidity in Wine Scope and Application This method conforms to AOAC Official Method 962.12. It determines the total or titratable acidity (TA) in wine, which is generally due to the tartaric, malic, and citric acid content of the grapes used. Method Summary Total acidity analysis involves the titration of samples with sodium hydroxide. In North America, an inflection endpoint is most commonly used to determine the TA, whereas a set endpoint at pH 7.0 is more common in Europe, New Zealand and Australia. Note that the software has the capability to determine both set pH endpoints and inflection endpoints simultaneously. Sample Titration Curve Method Performance Parameter Measuring Range* RSD for red wine sample (5.69ppt) RSD for white wine sample (6.42ppt) RSD for rose wine sample (5.97ppt) Specification 1.0 – 15 ppt 7.86% or +/- 0.45 ppt 1.54% or +/- 0.10 ppt 0.82% or +/- 0.05 ppt *This measuring range was determined by analyzing laboratory prepared standards formulated from potassium hydrogen phthalate. The measuring range may be increased by using larger capacity analysis vessels and/or auto-dilution. www.mantech-inc.com Load. Start. Done. Page 1 of 1 [email protected]
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