Effect of halogen ions on photochemical activity of dissolved black carbon
TU Yi-na1, TANG Wei1, MA Yan-qiong2, ZHANG Zhi-yu1, TIAN Sen-lin1, LI Ying-jie1
1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China; 2. Ecological Environment Monitoring Station of Anning Branch, Kunming Ecological Environmente Bureau, Anning 650300, China
Abstract：Dissolved black carbon (DBC) is regarded as an important part of natural organic matter, however, its photochemical activity in the estuary is not clear. Here, the soybean straw DBC as the target, the changes in the formation rate (FT), the loss rate constants (ks’), and the steady-state concentrations ([T]ss) of 3DBC* in the presence of halogen ions in the estuary was explored by energy transfer isomerization of sorbic acid. The effects of halogen ions on 3DBC* electron transfer were studied by 2,4,6-trimethylphenol method. The results showed that halogen ions and ionic strength did not affect FT, but ks’ was decreased due to ionic strength and heavy atom effect of Br-, which increased [T]ss. The photochemical experiment of high concentration DBC confirmed that the ionic strength effect caused the aggregation of DBC molecules, which weakened the charge transfer of 3DBC* and inhibited the quenching of 3DBC*. For energy transfer of 3DBC*, it was not directly affected by halogen ions and ionic strength, but by the increase of [T]ss. Moreover, it was further found that halogen ions and ionic strength had no significant effect on the low-energy (ET < 250kJ/mol) 3DBC*, but only on high-energy 3DBC*and became obviously with the increase of the concentrations of halogen ions and ionic strength.
屠依娜, 唐威, 马艳琼, 张志宇, 田森林, 李英杰. 卤素离子对溶解性黑碳光化学活性的影响[J]. 中国环境科学, 2022, 42(7): 3362-3369.
TU Yi-na, TANG Wei, MA Yan-qiong, ZHANG Zhi-yu, TIAN Sen-lin, LI Ying-jie. Effect of halogen ions on photochemical activity of dissolved black carbon. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3362-3369.
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