Mechanisms of reactive intermediates formation in saline-alkali agricultural waters

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-03-22 DOI:10.1016/j.watres.2025.123540

Xinyi Wang , Jiyang Liu , Songyang Li , Yaqin Miao , Yuting Shen , Hu Cui , Shengnan Hou , Hui Zhu

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Abstract

Reactive intermediates (RIs) are critical in nutrient cycling and pollution mitigation, yet their behavior in salinized agricultural waters remains underexplored. This study investigates RIs formation in rice cultivation water from a typical saline-alkali region in China. Singlet oxygen was more pH-sensitive than hydroxyl radical (•OH), while triplet excited-state dissolved organic matter were more influenced by salinity. Steady-state •OH concentration ([•OH]_ss) correlated strongly with concentrations of nitrite ([NO₂^--N]) and nitrate ([NO₃^--N]), with photolysis of NO₂^- and NO₃^-, and DOM contributing 19.50 %, 6.93 %, and 73.57 % to •OH formation, respectively. [RIs]_ss positively correlated with fluorescence index and negatively with autochthonous index, indicating exogenous DOM as a major RIs source. Additionally, [•OH]_ss was linked to aromatic content and DOM molecular weight, highlighting the importance of DOM structure in •OH production. These findings clarify the formation pathways of RIs in saline-alkali waters, informing ecological restoration and environmental management.

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来源期刊

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.