Abstract
Three popular variations of the iodometric determination of ozone were investigated using a spectrophotometric ozone monitor as the referee method. Determinations carried out with a neutral buffered potassium iodide reagent acidified to pH 2 with sulfuric acid were observed to give values that were 15–30 percent higher than those obtained with the unbuffered potassium iodide and Masschelein modification methods relative to the referee method. Sampling parameters such as flow rate were shown to have a marked effect on the determinations. Because of the technique‐sensitive nature of the determinations, it is recommended that iodometry not be pursued as a standard method for measuring ozone.
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