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5
“bisulphite” (HSO
3-
). The smaller part of the free is the active molecular SO
2
. The amount
of molecular SO
2
in your wine depends both on the level of free SO
2
present as well as pH.
For instance, at pH 3.2, the amount of free SO
2
for 0.8 ppm molecular SO
2
is 22 ppm. At
pH 3.5, you will need 43 ppm free - essentially double.
This meter is supplied with:
• Reagents set for 20 titrations
• Two 50 mL beakers
• Two 20 mL beakers
• Tubes set with cap
• ORP probe
• Stir bar
• Power cable
• One 230 mL bottle of Refill Solution
• One 1 mL syringe
• Instruction manual
• Warranty code
Note: Save all packing material until you are sure that the instrument works correctly.
Any defective item must be returned in its original packing.
Free SO
2
concentration (ppm) for 0.8 ppm molecular SO
2
:
In most situations, 0.8 ppm molecular SO
2
during bulk storage and at bottling will provide
you with adequate protection from oxidation and bacterial action. This includes prevention
of malolactic bacteria as well.
It is important to remember that the amount of free SO
2
in the wine depends on three
things: how much is added, how much was present before the addition and how much of
your addition promptly becomes bound.
The level at which molecular SO
2
can be detected by the human senses is about 2.0 ppm.
This is also the level which is needed for maximum protection of your wine. This is
particularly true in the case of sweet, and most notably, botrytised wines.
The Milwaukee Mi455 offers the possibility to test free or total SO
2
in all the wines
including the red ones, that are difficult to test with manual methods because the color
changes are hardly seen.
Hp 0.31.32.33.34.35.36.37.38.39.3
OSeerF
2
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