GRSP-induced diversity change of dissolved organic matter enhances the availability of PAHs in soil

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-07-18 DOI:10.1016/j.envpol.2025.126858

Xian Zhou , Pengfei Li , Fredrick Owino Gudda , Chao Qin , Ahmed Mosa , Wanting Ling , Jian Wang

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Abstract

The positive effects of glomalin related soil protein (GRSP) on soil ecological environment functions have been widely reported. However, the molecular mechanisms underlying GRSP-enhanced availability of polycyclic aromatic hydrocarbons (PAHs) in soils remain poorly understood. The desorption of both phenanthrene and pyrene from soils increased significantly with rising GRSP concentrations across the tested range (0–1000 mg/L), demonstrating a dose-responsive relationship. The results from Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) and UV–vis spectrophotometry revealed that GRSP addition altered the molecular diversity of dissolved organic matter (DOM), enriched phenyl structures and high-molecular-weight compounds in the retained DOM. This modification promoted DOM-PAH associations in solution and further enhanced PAH desorption from soil, thereby elucidating a potential molecular mechanism for GRSP-mediated PAH availability. These results further clarify the role of GRSP in reduction and control PAH-contaminated risks in soil, enrich people's understanding of the environmental functions of GRSP, and also provide a theoretical basis for regulating the pollution risk of PAHs by increasing the GRSP content in the soil.

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grsp诱导的溶解有机质多样性变化增强了土壤中多环芳烃的有效性

血管球蛋白相关土壤蛋白（GRSP）对土壤生态环境功能的积极作用已被广泛报道。然而，grsp提高土壤中多环芳烃（PAHs）可用性的分子机制仍然知之甚少。在测试范围内（0-1000 mg/L），随着GRSP浓度的增加，土壤中菲和芘的解吸显著增加，显示出剂量响应关系。傅里叶变换离子回旋共振质谱（FT-ICR-MS）和紫外-可见分光光度分析结果表明，GRSP的加入改变了溶解有机物（DOM）的分子多样性，增加了残留DOM中的苯基结构和高分子量化合物。这种修饰促进了溶液中DOM-PAH的结合，并进一步增强了PAH从土壤中的解吸，从而阐明了grsp介导的PAH有效性的潜在分子机制。这些结果进一步明确了GRSP在减少和控制土壤中多环芳烃污染风险中的作用，丰富了人们对GRSP环境功能的认识，也为通过增加土壤中GRSP含量来调节多环芳烃污染风险提供了理论依据。

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.