喀斯特地区冶炼厂周围土壤锑的释放及其环境影响

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

Environmental Pollution Pub Date : 2025-04-12 DOI:10.1016/j.envpol.2025.126249

Zaiju Jiang , Lu Liao , Xuexian Li , Shaozhang Yang , Ling Li , Pan Wu

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引用次数: 0

摘要

土壤中的锑可以通过降雨和地表径流驱动的淋滤过程重新进入环境，引起对二次污染的担忧。本文研究了中国南方喀斯特地区某锑冶炼区富碳酸盐土壤中锑的释放动态，旨在阐明pH、有机质（OM）和地质条件对锑运移的影响。实验在3种不同的pH条件下（4.5、6和7.5）进行，探讨OM对Sb在土壤中释放行为的影响。结果表明，土壤溶液中Sb的释放具有先快速增加后急剧下降再上升的特点。弱碱性土壤中Sb的浸出率高于酸性和弱酸性土壤。土壤OM的去除使Sb的释放提高了3.21 ~ 4.09倍，抑制率达到50.01 ~ 76.86%。研究结果表明，锑的释放动力学遵循初始快速释放、中期吸附抑制和后期二次释放的三相模式，这阐明了长期浸出风险的潜在机制，为预测污染物的分散提供了理论基础。土壤有机质通过官能团络合和土壤团聚体的形成有效地降低了Sb的迁移率，为有机改良剂等有机质修复策略的应用提供了直接证据。中性至弱碱性条件（pH 6-7.5）通过促进矿物解吸显著提高Sb的释放速率，表明Sb在喀斯特地区土壤中的污染风险较高。本研究强调在喀斯特地区应优先考虑提高OM浓度和调节pH缓冲能力来抑制Sb的活性，为Sb污染场地的修复和管理提供可操作的科学解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

The release of antimony from soils surrounding the smelters in Karst Areas and its Environmental Implications

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The release of antimony from soils surrounding the smelters in Karst Areas and its Environmental Implications

Antimony(Sb) in soil can be reintroduced into the environment through leaching processes driven by rainfall and surface runoff, raising concerns about secondary pollution. This study examined the release dynamics of Sb in carbonate-rich soils from an Sb smelting area in the karst region of southern China, aiming to elucidate the roles of pH, organic matter (OM), and geological conditions in Sb mobilization. The experiment was conducted under three different pH conditions (4.5, 6.0, and 7.5) and explores the influence of OM on the release behavior of Sb in the soil. Results indicated a characteristic release pattern for Sb in the soil solution, with an initial rapid increase, followed by a sharp decline, and a subsequent rise.The leaching rate of Sb was higher in neutral to weakly alkaline soil compared to acidic soils.The removal of soil OM enhanced Sb release by 3.21–4.09 times, with a significant inhibition rate reaching 50.01–76.86 %.

The findings suggested Sb release kinetics followed a triphasic pattern consisting of rapid initial release, mid-term adsorption inhibition, and late-stage secondary release, which elucidated the underlying mechanisms of long-term leaching risks and provided a theoretical foundation for predicting contaminant dispersion. Soil OM effectively reduced Sb mobility through functional group complexation and soil aggregate formation, offering direct evidence for OM-based remediation strategies such as organic amendment applications. Neutral to weakly alkaline conditions (pH 6.0–7.5) significantly enhanced Sb release rates by promoting mineral desorption, indicating elevated contamination risks of Sb in karst region soils. This study emphasizes that priority should be given to increasing OM concentration and regulating pH buffering capacity to suppress Sb activity in karst areas, providing actionable scientific solutions for the remediation and management of Sb-contaminated sites.

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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.