Percentage of SO2 in Kedem grape juice

I was talking with someone who works at Kedem grape juice. He told me that although they put Potassium Metabisulfite in their grape juice by the time the manufacturing process is done and you actually open your grape juice there are only 2-3 parts per million of "free SO2." That number seems incredibly low to me. Is it possible that he's correct or is he for sure wrong?

(Note it does say "contains sulfites" which is only necessary if there's at least 10 ppm, but it could be that they calculate this at an earlier stage or that they calculate total SO2, not free SO2.)

Topic potassium-meta-bisulfite homebrew

Category Mac

1
answered at

It is possible he is correct. The reason they have the message required for 10ppm is that probably the mean is 2-3ppm, but if something happens in manufacture that requires a large dosing then the level detectable is higher than 10ppm, this may be a rare occurrence or due to natural fluctuations in raw materials that require differential treatments.

It is as you state possible that they monitor this at an earlier stage, or that free and total are differently measured.

I would suggest there is no reason not to trust their statement, but we must accept that there may be variability.

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