文献类型：期刊文献

英文题名：Distribution and bioavailability of mercury in size-fractioned atmospheric particles around an ultra-low emission power plant in Southwest China

作者：Zhang, Wei Li, Jinjuan Qiu, Hao Guo, Xingqiang Fei, Zhijun Xing, Yi Yin, Deliang

第一作者：Zhang, Wei

通信作者：Li, JJ[1];Li, JJ[2];Yin, DL[2]

机构：[1]Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China;[2]Guizhou Inst Technol, Coll Resources & Environm Engn, Guiyang 550003, Peoples R China;[3]Guizhou Univ, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China;[4]Univ Sci & Technol Beijing, Sch Energy & Environm Engn, Beijing 100083, Peoples R China

第一机构：Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China;corresponding author), Guizhou Univ, Key Lab Karst Georesources & Environm, Minist Educ, Guiyang 550025, Peoples R China.

年份：2024

卷号：138

起止页码：141-152

外文期刊名：JOURNAL OF ENVIRONMENTAL SCIENCES

收录：;EI(收录号：20231613892115);Scopus(收录号：2-s2.0-85152428302);WOS:【SCI-EXPANDED(收录号:WOS:001146183800001)】；

基金：This work was supported by the Science and Technology Project of Guizhou Province (No. QKHJC [2020] 1Y187) , the Na-tional Natural Science Foundation of China (Nos. 41265008 , 42007305 , and 22166009) . We also thank Dr. Zhengcheng Song (Nanjing University) for his manuscript writing guidance.

语种：英文

外文关键词：Size-fractioned particles; Mercury; Chemical speciation; Coal-fired power plant; Ultra-low emission

摘要：The reaction of carbonyl-to-imine/hemiaminal conversion in the atmospheric aqueous phase is a critical pathway to produce the light-absorbing N-containing secondary organic compounds (SOC). The formation mechanism of these compounds has been wildly investigated in bulk solutions with a low ionic strength. However, the ionic strength in the aqueous phase of the polluted atmosphere may be higher. It is still unclear whether and to what extent the inorganic ions can affect the SOC formation. Here we prepared the bulk solution with certain ionic strength, in which glyoxal and ammonium were mixed to mimic the aqueous-phase reaction. Molecular characterization by High-resolution Mass Spectrometry was performed to identify the N-containing products, and the light absorption of the mixtures was measured by ultraviolet-visible spectroscopy. Thirty-nine N-containing compounds were identified and divided into four categories (N-heterocyclic chromophores, high-molecular-weight compounds with N-heterocycle, aliphatic imines/hemiaminals, and the unclassified). It was observed that the longer reaction time and higher ionic strength led to the formation of more N-heterocyclic chromophores and the increasing of the lightabsorbance of the mixture. The added inorganic ions were proposed to make the aqueous phase somewhat viscous so that the molecules were prone to undergo consecutive and intramolecular reactions to form the heterocycles. In general, this study revealed that the and has higher bioavailable fractions, while has potential transformation between chemical speciation.(c) 2023 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.