长江流域悬浮颗粒物-水界面Fe\Mn的迁移行为：环境影响及控制因素

IF 7.8 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-09-17 DOI:10.1016/j.psep.2025.107866

Guolian Li , Yang Wang , Xing Chen , Chunshan Xu , Shanshan Xi , Mingyu Fang , Jiamei Zhang , Xiangxiang Wang , Haibin Li , Fazhi Xie

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引用次数: 0

摘要

当环境条件发生变化时，铁（Fe）和锰（Mn）容易在悬浮颗粒物(SPM)-水界面迁移转化，对水生生态系统和污染物的行为产生重大影响。然而，长江流域水体界面铁锰输运的机制和影响因素尚不清楚。本研究系统采集了长江流域干流、8条支流和代表性湖泊的84份地表水样品，研究了其Fe、Mn的富集特征、在spm -水界面的分配行为及其控制因素。结果表明：长江干流、支流和湖泊水体SPM中Fe和Mn的平均浓度均超过了长江流域土壤背景值；平均Fe分配系数为：干流（5.65）>； 支流（5.52）>； 湖泊（5.48）；Mn分配系数为：湖泊（5.43）>； 支流（5.42）>； 干流（5.41）。铁分配系数与水体溶解氧显著相关（p <； 0.05），锰分配系数与水体pH显著相关（p <； 0.05）。干支流水体微生物群落以假单胞菌门、放线菌门和拟杆菌门为主，溶解铁浓度与放线菌门组相对丰度呈极显著负相关（P <； 0.01）。此外，碳（DOC，DIC）对主流中Fe\Mn界面迁移有显著影响。正矩阵分解表明，长江流域铁、锰富集主要受工矿投入的驱动。研究结果为长江流域水资源管理和生态保护提供了科学依据和理论支持。

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Migratory behavior of Fe\Mn at the suspended particulate matter-water interface on the Yangtze River Basin Scale: Environmental implications and controlling factors

Iron (Fe) and manganese (Mn) are prone to migration and transformation at the suspended particulate matter (SPM)-water interface when environmental conditions change, which significantly impacts the aquatic ecosystem and the behavior of pollutants. Nevertheless, the mechanisms and influencing factors governing Fe and Mn transport at the interface in the waters of the Yangtze River Basin remain poorly understood. In this study, 84 surface water samples were systematically collected from the mainstream, eight tributaries, and representative lakes in the Yangtze River basin to investigate the enrichment characteristics of Fe and Mn, their partitioning behaviour at the SPM–water interface, and the associated controlling factors. The results showed that the average concentrations of Fe and Mn in the SPM of the waters in the mainstreams, tributaries, and lakes all exceeded the background soil values of the Yangtze River basin. The mean Fe partition coefficients followed the trend: mainstream (5.65) > tributaries (5.52) > lakes (5.48), while Mn partition coefficients followed the opposite trend: lakes (5.43) > tributaries (5.42) > mainstream (5.41). Fe partition coefficients were significantly correlated with the dissolved oxygen of the water (p < 0.05), and the Mn partition coefficients were significantly correlated with the pH of the water (p < 0.05). The microbial communities in the water of the mainstream and tributaries were dominated by Pseudomonadota, Actinomycetota, and Bacteroidota, and the concentrations of dissolved Fe were significantly negatively correlated with the relative abundances of Actinomycetota group (P < 0.01). In addition, carbon (DOC,DIC) were found to have significant effects on the Fe\Mn interface migration in the mainstream. Positive matrix factorization indicated that Fe and Mn enrichment in Yangtze River Basin is primarily driven by inputs from of industrial and mining activities. These findings provide a scientific basis and theoretical support for water resources management and ecological protection in Yangtze River Basin.

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

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