Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
Environ Sci Technol. 2010 Sep 1;44(17):6656-60. doi: 10.1021/es1008278.
The hygroscopicity and mass loss of aerosols initially composed of maleic acid have been investigated before and after reaction with ozone. The phase of the aerosol, solid or aqueous, during the reaction with ozone strongly affects the composition of the processed aerosol. Furthermore the loss of aerosol mass, via the production of volatile ozonolysis products, does not occur until the processed aerosol has existed as an aqueous phase aerosol. The loss rate of the aerosol mass appears to follow unimolecular first order kinetics which is consistent with the rate determining step being the cleavage of a weak hydroperoxide, or peroxide, bond (approximately 104 kJ mol(-1)). This speculative rate determining step, which is not based on chemical analysis, is possibly a universal feature in the ozonolysis of organic aerosol containing the alkene functionality.
已研究过初始由马来酸组成的气溶胶在与臭氧反应前后的吸湿性和质量损失。在与臭氧反应过程中，气溶胶的相态（固态或液态水）强烈影响处理后气溶胶的组成。此外，只有当处理后的气溶胶作为水相气溶胶存在时，才会通过挥发性臭氧分解产物的生成而导致气溶胶质量损失。气溶胶质量的损失速率似乎遵循单分子一级动力学，这与速率决定步骤是弱过氧化物或过氧化物键（约 104 kJ mol(-1))的断裂一致。这种推测的速率决定步骤不是基于化学分析，可能是含有烯烃官能团的有机气溶胶臭氧分解的普遍特征。
