Investigation of chemical methods for ozone determination in test chambers

Abstract Several chemical methods commonly used for the measurement of ozone concentration in connection with the ozone cracking test of elastomers in test chambers were investigated in detail. The relevant parameters, namely the concentration of potassium iodide, nature and concentration of buffer, aspirating conditions and methods of determining the conversion, were varied and their influence on the results investigated. An absorption solution containing 3% potassium iodide in 0·1 m phosphate buffer was confirmed to be optimal. The boric acid buffer was found to be unsuitable. The titration procedure can be avoided by UV spectrometric measurement of iodine generated. The discrepancy of the results compared with the on-line UV spectrometric ozone determination needs to be investigated further.