ISI 20-1e Determination of Sulphur Dioxide in Starch
Return 1. Scope The method is applicable to native and modified starch. LT 13 Sep 1999 2. Principle Sulphur dioxide is released by boiling with acid. The gas is collected in hydrogen peroxide and oxidised to sulphuric acid and tirated with alkali. 3. Apparatus 3.1 Analytical balance weighing to the nearest 1 g. 3.2 Monier-Williams Sulphites Distillation Apparatus consisting of a three neck 1000ml boiling flask with a sloping Allihn reflux condenser, a right angle inlet adapter with a bubbler tube (scrubber), a 60-ml dropping funnel and 500 ml conical flask (collector / receiver) 3.3 Electrical heater 4. Reagents 4.1 Sodium carbonate solu