Formation Mechanisms of Iodine-Ammonia Clusters in Polluted Coastal Areas Unveiled by Thermodynamics and Kinetic Simulations.,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Formation Mechanisms of Iodine-Ammonia Clusters in Polluted Coastal Areas Unveiled by Thermodynamics and Kinetic Simulations.
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2020-06-26 , DOI: 10.1021/acs.est.9b07476
Deming Xia ₁ , Jingwen Chen ₁ , Huan Yu ₂ , Hong-Bin Xie ₁ , Ya Wang ₁ , Zhongyu Wang ₁ , Tong Xu ₁ , David T Allen ₃

Affiliation

It has been revealed that iodine species play important roles in atmospheric new particle formations (NPFs) in pristine coastal areas. However, it is unclear whether other atmospheric species, such as NH₃, for which the levels in coastal areas of China are >2.5 × 10¹⁰ molecules·cm^–3 are involved in the NPFs of iodine species, although NH₃ has been proved to promote particle formation of H₂SO₄. Via high-level quantum chemical calculations and atmospheric cluster dynamic code simulations, this study unveiled new mechanisms of nucleation, in which NH₃ mediates the formation of iodine particles by assisting hydrolysis of I₂O₅ or reacting with HIO₃. The simulated formation rates of iodine–ammonia clusters via the new mechanisms are much higher than those simulated via sequential addition of HIO₃ with subsequent release of H₂O, under the condition that NH₃ concentrations are higher than 10¹⁰ molecules·cm^–3. The new mechanisms can well explain the observed cluster formation rates at a coastal site in Zhejiang of China. The findings not only expand the current understandings of the role of NH₃ in NPFs but also highlight the importance of monitoring and evaluating NPFs via the iodine–ammonia cluster pathway in the coastal areas of China and other regions worldwide.

更新日期：2020-08-04

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>