naivkezdo Creative Commons License 2021.02.21 0 0 1490

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As temperature increases, free SO2 increases and bound SO2 decreases. (SO2 bound to acetaldehyde remains constant.) This is because increased temperatures cause partial dissociation of the bound SO2 form, resulting in increased free SO2 and hence increased molecular SO2 concentrations.

For example, a wine containing 68 mg of free SO2 at 0°C (30°F) will contain 85 mg at 15°C (57°F) and 100 mg at 30°C (84°F) [Peynaud, 1984]. Sudraud [1977] showed 64 mg/l of free SO2 at 16°C increased to 120 at 48°C and to 200 at 80°C, as BSO2 was released.