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photochemical production of Methyl Halides with Guaiacol as the Precursor

Journal of Ocean University of China 2024年第5期23卷 1275-1286页

作者： YANG Fan ZHANG Yan WU Guanyu HE Zhen YANG Guipeng Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao Marine Science and Technology CenterQingdao 266237China Institute of Marine Chemistry Ocean University of ChinaQingdao 266100China

Methyl halides are crucial trace greenhouse gases in the atmosphere,playing a significant role in global climate change and the atmospheric *** study investigated the photochemical production of methyl halides in an artificial seawater system using guaiacol as a precursor through laboratory simulation *** influences of various environmental factors,including illumination time,radiation wavebands,illumination intensity,concentrations of guaiacol and halide ions(X^(-)),Fe^(3+),salinity,dissolved oxygen(DO),and pH value on the photochemical production of methyl halides were *** demonstrated that increased illumination intensity and duration promote the photochemical production of methyl halides,with a notable enhancement under UV-B *** and halide ions were identified as key precursors,and their high concentrations facilitated the formation of methyl ***,different types of halide ions exhibited a competitive relationship in producing methyl *** study found that an increase in pH inhibited the photochemical formation of CH_(3)I due to the reaction between OH^(-)and·CH_(3).Dissolved oxygen was found to inhibit the photochemical formation of CH3I while promoting the formation of CH_(3)***,an appropriate concentration of Fe^(3+)enhanced the photochemical production of methyl *** observations indicated a high photochemical production of methyl halides in the natural waters near Qingdao’s coastal area,likely due to the high concentration of dissolved organic matter(DOM),which supports photochemical ***,the photochemical production of methyl halides in natural seawater was significantly higher than in dark conditions,underscoring the importance of illumination in promoting these photochemical processes in seawater.

关键词： methyl halides photochemical production dissolved organic matter guaiacol

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Influence Factors on photochemical production of Methyl Iodide in Seawater

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Journal of Ocean University of China 2020年第6期19卷 1353-1361页

作者： CHEN Yan LIU Shanshan YANG Guipeng HE Zhen Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Institute of Marine Chemistry Ocean University of ChinaQingdao 266100China

Methyl iodide(CH3I)is an important trace greenhouse gas in the atmosphere and an ozone-depleting *** 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 CH3I in artificial seawater(ASW)were tested by simulated solar *** addition,Yangtze River Estuary waters from inshore to offshore were used to explore the relationship between the photochemical production of CH3I 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 CH3I in *** addition of Fe^3+accelerated the photochemical production of CH3I,but high concentrations of Fe^3+inhibited the formation of *** 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 CH3I within the Yangtze River *** photochemical production of CH3I in the seawater was significantly higher under light conditions relative to dark conditions,indicating that illumination accelerated the production of CH3I.

关键词： methyl iodide photochemical production Yangtze River Estuary dissolved organic matter

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