Food Additives: Direct / Chemical Preservatives

AOAC Official Method 892.02
Sulfurous Acid (Free) in Meats

Titrimetric Method
First Action 1892
Final Action

References:
J. Prakt. Chem. 46, 428(1892).
Repts. on Public Health and Med. Subject No. 43 (London, Ministry of Health, p. 12).
CAS-7446-09-5 (sulfur dioxide)
CAS-7782-99-2 (sulfurous acid