M892 02
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This 3 sentence summary provides the key details from the document: This document outlines an official titrimetric method for determining the amount of sulfurous acid (free) in meats. The method involves treating a 50mL meat sample with sulfuric acid and sodium carbonate, then titrating the sample with iodine solution using starch indicator. The amount of sulfurous acid is calculated based on the amount of iodine solution needed to turn the solution blue, with 1mL of 0.02N iodine solution equivalent to 0.64mg of sulfur dioxide.
M892 02
- 1. 47.3.47 AOAC Official Method 892.02 Sulfurous Acid (Free) in Meats Titrimetric Method Final Action Treat 50 mL sample in 200 mL flask with ca 5 mL H2SO4 (1 + 3), add ca 0.5 g Na2CO3 to expel air, and titrate H2SO3 with 0.02N I2, using few mL starch indicator, (mix ca 2 g finely powdered potato starch with cold H2O to thin paste; add ca 200 mL boiling H2O, stirring constantly, and immediately discontinue heating; add ca 1 mL Hg, shake, and let solution stand over the Hg). Add I2 solution as rapidly as possible and continue addition until solution stays blue several min. 1 mL 0.02N I2 = 0.64 mg SO2. 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) Copyright 1998 AOAC INTERNATIONAL