Ben Rotter ) wrote:
>> I often read that the k-meta contain 57% sulphite and the campden
>> tablets 48%. I would like a clarification on that.

>K-meta is about 58% SO2.

>Campden tablets are designed to have about 0.44 grams of (often K-)
>meta. Whether they are 48% SO2 or not really depends on the tablet
>size, which tends to vary depending on the manufacturing process.
>
>> B) The 57% mean that from any given amount of k-meta added you will
>> roughly get 57% of free SO2 ( theorical of course )

>It means you'll get ~58% *total* SO2. Some of that will then become
>free, and some will become bound (total = bound + free).

>See http://members.tripod.com/~BRotter/SO2.htm for more.

>Ben

And FWIW, when I've "standardized" bags of meta, I've found actual
levels more like 36%.

And it'd be less if you use hot water or water with chlorine (so
I've been told--does anyone know for sure if chlorine reacts with
SO2) to dissolve your meta.

Dave
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Dave Breeden