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Title
Japanese: 
English:Photo-production of excited triplet-state of dissolved organic matters in inland freshwater and coastal seawater 
Author
Japanese: Guo Zhongyu, Tingting Wang, Hidetaka Ichiyanagi, Ibrahim MohamedAteia, CHEN GUO, Wang Jieqiong, 藤井 学, Kaichii En, Tiansheng Li, Rumi Sohrin, Kaichii En, Tiansheng Li, 吉村 千洋.  
English: Zhongyu Guo, Tingting Wang, Hidetaka Ichiyanagi, Mohamed Ateia, Guo Chen, Jieqiong Wang, Manabu Fujii, Kaichii En, Tiansheng Li, Rumi Sohrin, Kaichii En, Tiansheng Li, Chihiro Yoshimura.  
Language English 
Journal/Book name
Japanese: 
English:Water Research 
Volume, Number, Page Vol. 253       
Published date Apr. 1, 2024 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1016/j.watres.2024.121260
Abstract The excited triplet-state of dissolved organic matter (3DOM*) is a major reactive intermediate in sunlit waters. Its quantum yield is important in understanding the fate of organic micropollutants. The degradation efficiency of its chemical probe, 2,4,6-trimeythlphenol (fTMP), is generally used as a proxy of the quantum yield. However, fTMP has been described and modelled only for freshwater systems. Therefore, this study quantified fTMP in inland freshwater and coastal seawater sampled in Japan by conducting steady-state photochemical experiments. Optical properties of water were then used to model fTMP. Results indicated that the inland freshwater DOM originated mainly from terrestrial sources, while the coastal seawater DOM were microbial-dominated. On average, inland freshwater exhibited lower fTMP (61.2 M?1) than coastal seawater (79.7 M?1) and the coastal seawater exhibited significant variations in the proportion of high-energy 3DOM* (> 250 kJ/mol). In addition, E2:E3 (ratio of absorbance at 254 to 365 nm) was positively correlated with fTMP of inland freshwater, coastal seawater, and the overall dataset. Catchment conditions such as forest coverage also influenced the production of 3DOM* and high-energy 3DOM* in inland freshwater. Furthermore, the developed models estimated fTMP based on the optical properties of both freshwater and seawater, providing valuable insights about 3DOM* photochemistry in the aquatic environment.

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