Method 411, Air Sampling and Analysis, 3rd Edition (Determination of
oxidizing substances in the atmosphere)
Micro-amounts of ozone and the oxidants liberate iodine when absorbed in a
1% solution of potassium iodine buffered at pH 6.8 + 0.2. The iodine is
determined spectrophotometrically by measuring the absorption of tri-iodide
ion at 352 nm.