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Interactions between iron mineral and low-molecular-weight organic acids accelerated nitrogen conversion and release in lake sediments
Water Research ( IF 11.4 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.watres.2025.123174
Wan Yang, Yunfei Liang, Taige Li, Wenjing Li, Xiaolin Liao, Bing Wang, Xiaozhi Wang, Shengsen Wang

Endogenous nitrogen (N) release from lake sediments is one of main causes affecting water quality, which can be affected by the presence of iron (Fe) minerals and organic matter, especially low-molecular-weight organic acids (LMWOAs). Although these substances always coexist in sediments, their interaction effect on N fate is not yet clear. In this study, the role and mechanisms of the coexistence of iron mineral (ferrihydrite, Fh) and LMWOAs, i.e. citric acid (CA) and galacturonic acid (GA) on the release and transformation of N in lake sediments were systematically evaluated via microcosm cultivation for 45 d Results showed that the addition of Fh+LMWOAs significantly accelerated N mineralization and conversion in lake sediments, accompanied by increasing ferrous iron content and decreasing redox potential. Biotic pathways played more critical roles than abiotic oxidation pathways during this process, and Fh+LMWOAs strengthened cooperation among microbial species by forming complex topologies and higher positive correlations. Correspondingly, cellular functions, iron respiration, and N metabolism modules were increased. CA with high carboxyl content showed greater total nitrogen removal and metabolic abundance. The present findings facilitate understanding the synergies of iron minerals and organic matter on N fate and N biogeochemical cycling in lake sediments.

中文翻译:


铁矿物与低分子量有机酸之间的相互作用加速了湖泊沉积物中氮的转化和释放



湖泊沉积物中内源性氮 (N) 的释放是影响水质的主要原因之一,水质会受到铁 (Fe) 矿物质和有机物(尤其是低分子量有机酸 (LMWOA) 的影响。尽管这些物质总是共存于沉积物中,但它们对 N 命运的相互作用影响尚不清楚。本研究通过微观培养 45 d,系统评价了铁矿物(水铁矿,Fh)和 LMWOAs(柠檬酸 (CA) 和半乳糖醛酸 (GA))共存对湖泊沉积物中氮释放和转化的作用和机制。结果表明,Fh+LMWOAs的添加显著加速了湖泊沉积物中氮的矿化和转化, 伴有亚铁含量增加和氧化还原电位降低。在此过程中,生物途径比非生物氧化途径发挥更关键的作用,Fh+LMWOAs 通过形成复杂的拓扑结构和更高的正相关性加强了微生物物种之间的合作。相应地,细胞功能、铁呼吸和 N 代谢模块增加。高羧基含量的 CA 显示出更大的总氮去除和代谢丰度。目前的发现有助于理解铁矿物和有机物对湖泊沉积物中氮命运和氮生物地球化学循环的协同作用。
更新日期:2025-01-21
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