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Schematic of gas phase titration system used in testing, showing an ozonator and heated glass beads.
Diagram of analysis showing components of air at the top and the combination of species measured by each type of analytic step on the right. Differences between analytic steps provide individual components. The key difference between this technique and chemiluminescence is that water is an additive interference that can be subtracted and not a source of possibly variable levels of quenching.
and measurements. The equivalent baseline is consistent with water interference for ambient relative humidity at 48% of and was taken by turning up the ozone flow rate to the point that formed in the tee connecting ozone to sample. After turning off the ozone, a signal is present. Turning the ozone to an intermediate value gives a signal resulting in a signal from NO. PANs were not detectable at the time of the measurement but would be expected to result in a difference between the signals with and without the glass bead heater.
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