Gas-phase UV absorption spectra and OH-oxidation kinetics of 1-1,2,3-triazole and pyrazole.

In this work, we report the gas phase UV absorption spectra and the kinetics of the OH-oxidation of 1-1,2,3-triazole and pyrazole. UV spectra were determined between 200 and 250 nm, at 350 ± 2 K and at pressures between 0.09 and 0.3 Torr. The reported maximal UV absorption cross sections are (cm per molecule): = 2.04 × 10 and = 5.44 × 10. The very low absorption capacity of these compounds beyond 240 nm indicates that their atmospheric photodissociation is negligible. The OH-oxidation of these species was performed in an atmospheric simulation chamber coupled to an FTIR spectrometer and to a GC/MS over the temperature range 298-357 K and at atmospheric pressure. Experiments were conducted in relative mode using benzaldehyde, -2-hexenal and heptane as references. The obtained rate constants at 298 K were (×10 cm per molecule per s): (OH + 1-1,2,3-triazole) = 2.16 ± 0.41; (OH + pyrazole) = 2.94 ± 0.42. These results were compared to those available in the literature and discussed in terms of structure-reactivity and temperature dependency. Their tropospheric lifetimes with respect to reaction with OH radicals were then estimated.