Inhibition of the S(IV) Autoxidation in the Atmosphere by Secondary Terpenic Compounds |
| |
Authors: | W Pasiuk-Bronikowska T Bronikowski M Ulejczyk |
| |
Institution: | (1) Polish Academy of Sciences, Institute of Physical Chemistry, Kasprzaka 44/52, Pl-01-224 Warsaw, Poland, E-mail |
| |
Abstract: | To better understand the role of terpenic compounds in atmospheric chemistry the influence of sobrerol, a water-soluble product of photochemical autoxidation or ozonolysis of -pinene, on the rate of S(IV) autoxidation was studied. Laboratory experiments were performed under heterogeneous conditions, at constant supply with S(IV) by dissolution of CaSO3.1/2 H2O fine particles and with air oxygen by diffusion through a planar gas-liquid interface. The progress of S(IV) autoxidation, uncatalysed or catalysed by Fe2(SO4)3 or CoSO4, was followed conductometrically. The inhibiting effect of sobrerol was discussed in terms of the chain reaction terminated in a step linear with respect to sulphoxy radicals. A method was proposed for quantification of the inhibiting effect and the rate constant (2.0–3.8)108 M–1s–1 was given for the step eliminating sulphate radicals. Further consequences of the inhibition: shifting the reaction locus from the gas-liquid (droplet) interface to the liquid (droplet) bulk and strong oscillations in the rate of S(IV) autoxidation resulting of the activity of sobrerol-derived radicals were also shown. |
| |
Keywords: | aqueous phase cloud chemistry heterogeneous reaction inhibition by terpenes sobrerol sulphur oxidation |
本文献已被 SpringerLink 等数据库收录! |
|