I have a curious regarding Sulphur Dioxide/ Sulphite even both are not major allergen according to Food Allergen Labeling Act of 2004 but if I want to control it (not more than 10 ppm) which term I should control according to US regulation Sulphur Dioxide or Sulphite?
For EU regulation it is clarifying to control in term of SO2 but I can not find for USA so need your all advise //\\
I'm not in USA so this response is ex google.
The answer to yr query seems slightly complicated.
The official (10ppm) reg. is i think here -
(esp. see pt 4)
Note that the relevant amount should be determined by experiment .
The referenced AOAC experimental procedure is detailed here -
As per 2nd link, the final amount is calculated as ppm SO2 (despite the titled terminology "sulphite")
Other refs may use the terminology "Total SO2" which seems more logical (to me), eg -