Clay is the most emitted type of dust in the atmosphere and offers a large surface for heterogeneous interactions with atmospheric compounds. In this study, we focus on the uptake of ozone (O₃) by montmorillonite and kaolinite dust samples at atmospheric pressure in a coated-wall flow tube reactor. The influence of relevant environmental parameters, such as O₃ concentration, relative humidity, and temperature, is determined. A mechanism for O₃ interaction with the surface sites of clays is described, and atmospheric implications are discussed. Although the impact of O₃ uptake by fresh clay dust seems limited in the atmosphere, this work highlights the need to consider relevant and thoroughly defined uptake coefficients in models. Moreover, the presence of a pressure-dependence in the mechanism of O₃ uptake by dust suggested in this work helps reconciling measurements made at atmospheric pressure with those performed at low pressure in Knudsen cells.

中文翻译：

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环境条件下粘土粉尘对臭氧的吸收

粘土是大气中最易散发的灰尘，为与大气化合物的异质相互作用提供了较大的表面。在这项研究中，我们着重于在大气压下在涂层壁流管反应器中蒙脱石和高岭石粉尘样品对臭氧（O ₃）的吸收。确定相关环境参数（例如O ₃浓度，相对湿度和温度）的影响。描述了O ₃与粘土表面位点相互作用的机理，并讨论了对大气的影响。虽然影响O ₃新鲜黏土粉尘的吸收似乎在大气中是有限的，这项工作强调了需要考虑模型中相关且彻底定义的吸收系数。此外，这项工作中提出的灰尘吸收O ₃的机制中存在压力依赖性，这有助于使在大气压下进行的测量与在努德森电池中在低压下进行的测量相一致。