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      Influence Factors on Photochemical Production of Methyl Iodide in Seawater

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          Methyl iodide (CH 3I) is an important trace greenhouse gas in the atmosphere and an ozone-depleting substance. The influence of different environmental factors, such as the duration of illumination; the strength of illumination; the concentrations of humic acid, ferric ion (Fe 3+), and iodide ion (I ); and pH, on the photochemical production of CH 3I in artificial seawater (ASW) were tested by simulated solar irradiation. In addition, Yangtze River Estuary waters from inshore to offshore were used to explore the relationship between the photochemical production of CH 3I and different sources of dissolved organic matter (DOM) in natural seawater (NSW). The results revealed that higher concentrations of humic acid and I , as well as higher strengths of illumination and longer illumination durations, promoted the photochemical formation of CH 3I in ASW. The addition of Fe 3+ accelerated the photochemical production of CH 3I, but high concentrations of Fe 3+ inhibited the formation of CH 3I. Experiments on NSW obtained from the Yangtze River estuary spiked when concentrations of DOM were high, confirming that DOM plays an important role in facilitating the photochemical production of CH 3I within the Yangtze River Estuary. The photochemical production of CH 3I in the seawater was significantly higher under light conditions relative to dark conditions, indicating that illumination accelerated the production of CH 3I.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          15 November 2020
          01 December 2020
          : 19
          : 6
          : 1353-1361
          1Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
          2Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
          3Institute of Marine Chemistry, Ocean University of China, Qingdao 266100, China
          Author notes
          *Corresponding author: HE Zhen, E-mail: zhenhe@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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