Freeze-induced acceleration of iodide oxidation and consequent iodination of dissolved organic matter to form organoiodine compounds  

作　　者：Xuexin Gong Mei He Zhineng Hao Rusong Zhao Jingfu Liu 

机构地区：[1]School of Resources and Environment,Yangtze University,Wuhan 430100,China [2]State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [3]Qilu University of Technology(Shandong Academy of Sciences),Shandong Analysis and Test Center,Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province,Jinan 250014,China [4]Institute of Environment and Health,Jianghan University,Wuhan 430056,China

出　　处：《Journal of Environmental Sciences》2024年第10期67-75,共9页环境科学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.22176199,21806173,and 42192571);the Jinan University and Institute Innovation Team Project(No.2021GXRC061).

摘　　要：Freeze-induced acceleration of I–oxidation and the consequent iodination of dissolved organic matter(DOM)contribute to the formation of organoiodine compounds(OICs)in cold regions.The formed OICs may be a potentially important source of risk and are very closely with the environment and human health.Herein,we investigated the acceleration effects of the freeze process on I–oxidation and the formation of OICs.In comparison to reactive iodine species(RIS)formed in aqueous solutions,I–oxidation and RIS formation were greatly enhanced in frozen solution and were affected by pH,and the content of I–and O_(2).Freeze-thaw process further promoted I–oxidation and the concentration of RIS reached 45.7μmol/L after 6 freeze-thaw cycles.The consequent products of DOM iodination were greatly promoted in terms of both concentration and number.The total content of OICs ranged from 0.02 to 2.83μmol/L under various conditions.About 183–1197 OICs were detected by Fourier transform ion cyclotron resonance mass spectrometry,and more than 96.2%contained one or two iodine atoms.Most OICs had aromatic structures and were formed via substitution and addition reactions.Our findings reveal an important formation pathway for OICs and shed light on the biogeochemical cycling of iodine in the natural aquatic environment.

关 键 词：Freeze process Dissolved organic matter(DOM) IODINATION Organoiodine compounds(OICs) Ultrahigh resolution mass SPECTROMETRY 

分 类 号：X52[环境科学与工程—环境工程]