Photic versus Aphotic Production of Organohalogens from Native versus Invasive Wetland Plants-Derived Dissolved Organic Matter

IF 11.4 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Water Research Pub Date : 2025-01-06 DOI:10.1016/j.watres.2025.123103
Yu Fu, Xueqi Hu, Pu Wang, Qingchao Li, Lingli Wang, Jialin Chen, Zhaohui Wang
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Abstract

The aphotic formation of natural organohalogens (NOHs) remains inadequately understood, in contrast to the well-documented photo-halogenation process of dissolved organic matter (DOM), despite the significant biogeochemical implications associated with NOHs. This study investigates the differences in the formation of chlorinated and brominated compounds from the photochemical and aphotic reactions of native Phragmites australis (PA-DOM) and invasive Spartina alterniflora (SA-DOM). The findings indicate that SA-DOM exhibits a greater potential for photochemical halogenation, attributed to its higher aromatic content and enhanced photostability. Utilizing advanced mass spectrometry, the study identifies nitrogen-containing and free saturated compounds as primary precursors for both types of DOM during photochemical halogenation. Notably, significant disparities in the halogenation processes of lignin/CRAM, nitrogen-containing/free saturated compounds, and amino sugars between SA-DOM and PA-DOM are observed, leading to a higher production of NOHs in PA-DOM during aphotic reactions compared to photic reactions, even in artificial seawater. Furthermore, the study emphasizes the critical role of dissolved oxygen in the formation of NOHs from PA-DOM under aphotic conditions. Given the rapid fluctuations in oxygen levels, salinity, and solar intensity, alongside tidal and diurnal cycles, the significance of both photic and aphotic pathways for NOHs formation should not be overlooked.

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尽管天然有机卤素(NOHs)对生物地球化学具有重要影响,但与溶解有机物(DOM)的光卤化过程形成鲜明对比的是,天然有机卤素(NOHs)的虹吸形成过程仍未得到充分了解。本研究调查了原生葭(PA-DOM)和入侵的互花叶斯巴达(SA-DOM)的光化学反应和虹吸反应所形成的氯化和溴化化合物的差异。研究结果表明,SA-DOM 具有更大的光化学卤化潜力,这是因为其芳烃含量更高,光稳定性更强。该研究利用先进的质谱技术,确定含氮和游离饱和化合物是光化学卤化过程中两种类型 DOM 的主要前体。值得注意的是,在 SA-DOM 和 PA-DOM 之间,木质素/CRAM、含氮/游离饱和化合物和氨基糖的卤化过程存在显著差异,导致 PA-DOM 在噬水反应过程中产生的 NOHs 多于光反应,即使在人工海水中也是如此。此外,该研究还强调了溶解氧在噬水条件下 PA-DOM 形成 NOHs 的关键作用。鉴于氧气含量、盐度和太阳强度以及潮汐和昼夜周期的快速波动,NOHs 形成的光反应和噬氧反应途径的重要性不容忽视。
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来源期刊
Water Research
Water Research 环境科学-工程:环境
CiteScore
20.80
自引率
9.40%
发文量
1307
审稿时长
38 days
期刊介绍: Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.
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