Measurement of Ozone Concentrations in Ambient Air Using a Badge-Type Passive Monitor |
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Authors: | J Zhou |
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Institution: | Division of Life Sciences, King’s College London , London , England |
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Abstract: | Abstract A badge-type passive monitor was used to evaluate the effectiveness of four ozone trapping reagents for measuring O3 concentrations in the air. These were sodium nitrite (NaNO2), 3-methyl-2-benzothiazolinone acetone azine (MBTH), p-acetamidophenol (p-ATP), and indigo carmine. Experiments in an exposure chamber showed that only NaNO2 and MBTH monitors gave sensitive and linear responses over realistic ranges of O3 concentrations. When tested in ambient air, NaNO2 and MBTH monitors with a single-layer diffusion barrier overestimated O3 concentrations by a significant amount. This was largely canceled out in the NaNO2 monitor by using a multi-layered diffusion barrier to combat wind turbulence effects. However it had almost no effect on the MBTH monitor, and it was found that NO2 was a source of serious interference. We concluded that using the NaNO2 monitor with an effective diffusion barrier can measure O3 in ambient air with an accuracy of ±16%. |
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