Sensitive Passive Sampler for Ozone

Abstract

A simple diffusive ozone sampler, which allowed to determine atmospheric ozone with high sensitivity, was developed. It utilized oxidative dimerization of p-acetamidophenol by ozone, which gave a strongly fluorescent dimer. The fluorescence intensity was measured at 425 nm with excitation at 337 nm. The determination limit was 2 ppb for one-hour exposure. Fluorescence intensities measured by the present method showed a good linearity with ozone concentrations determined by an ultraviolet-absorption ozone analyzer. The effects of the temperature, humidity, wind velocity and wind direction on the obserbed values were within a tolerance limit.