Testing VINOFERM SO2 Test

Testing VINOFERM SO2 Test

Post by Art Schuber » Thu, 20 Feb 2003 06:59:33



I have VINOFERM's test kit with the iodine SO2 titration solution. I
have used it a couple of times but don't trust the results.

So, I thought I might put some potassium metabisulfite into solution
in a known concentration and then run vinoferm's free SO2 test to see
if it matches what I added. Does this make sense?

If so, to what should I add the KMBS? I don't want to use up my wine.
Would a weak acid solution work? Vinegar? Lemon juice? To a certain
pH?

Art

 
 
 

Testing VINOFERM SO2 Test

Post by David C Breed » Thu, 20 Feb 2003 12:06:09


Quote:

>I have VINOFERM's test kit with the iodine SO2 titration solution. I
>have used it a couple of times but don't trust the results.
>So, I thought I might put some potassium metabisulfite into solution
>in a known concentration and then run vinoferm's free SO2 test to see
>if it matches what I added. Does this make sense?
>If so, to what should I add the KMBS? I don't want to use up my wine.
>Would a weak acid solution work? Vinegar? Lemon juice? To a certain
>pH?
>Art

Hi Art,

If you add KMBS to plain old water, all of the potential SO2 (57% by
weight) will be there are free SO2, as there's nothing for SO2 to
bind to in water.

None of it will exist as moleular SO2, but that's not what you're
testing for anyway.

Dave
****************************************************************************


 
 
 

Testing VINOFERM SO2 Test

Post by Art Schuber » Fri, 21 Feb 2003 01:05:59


Many thanks, Dave.

Art


Quote:


>>I have VINOFERM's test kit with the iodine SO2 titration solution. I
>>have used it a couple of times but don't trust the results.

>>So, I thought I might put some potassium metabisulfite into solution
>>in a known concentration and then run vinoferm's free SO2 test to see
>>if it matches what I added. Does this make sense?

>>If so, to what should I add the KMBS? I don't want to use up my wine.
>>Would a weak acid solution work? Vinegar? Lemon juice? To a certain
>>pH?

>>Art

>Hi Art,

>If you add KMBS to plain old water, all of the potential SO2 (57% by
>weight) will be there are free SO2, as there's nothing for SO2 to
>bind to in water.

>None of it will exist as moleular SO2, but that's not what you're
>testing for anyway.

>Dave
>****************************************************************************


 
 
 

Testing VINOFERM SO2 Test

Post by Don » Fri, 21 Feb 2003 02:52:49


Art,
I'd be interested in anything you want to post about your results
or how you tested? How to test a tester is good info.

Don