溶解有机质在高寒河流系统中促进砷富集的作用:现状与展望

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Tianliang Zheng, Yue Jiang, Xiangjun Pei
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引用次数: 0

摘要

全球范围内的高寒河流系统都存在地源性As富集,但DOM转化对As富集的促进作用尚不清楚。本文旨在总结全球高寒河流系统中砷异常的典型赋存状态和DOM的主要成分,并评价不同地球化学情景下DOM参与砷动员的关键途径。由于冰川退化、大气污染和多年冻土融化等原因,高寒河流系统的dom组成与下游城市化河流流域不同。值得注意的是,DOM中不同的官能团可能通过触发含As矿物转化、改变As氧化还原种、竞争吸附和表面络合物种的形成来潜在地影响As的迁移。三元DOM-Fe-As络合物的形成也是控制水-沉积物界面As迁移的关键。未来的研究重点应是对高寒河流系统中DOM和As同步转化的时空变化进行长期、高分辨率的监测,并迫切需要利用综合表征技术结合最新的统计分析,定量地完善我们对高寒河流系统中DOM转化促进As富集的详细机制的认识。这是开发地球成因砷富集修复技术和确保全球水源安全饮用水供应的基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Underexplored Role of Dissolved Organic Matter in Facilitating Arsenic Enrichment in Alpine Riverine Systems: A Review of Current Status and Future Perspectives

Purpose of Review

Geogenic As enrichment occurs in alpine riverine systems worldwide, while the understanding of the facilitation of DOM transformation on As enrichment remains unclear. This review aims to summarize the typical occurrence of As anomaly and the principal components of DOM in global alpine river systems, and evaluate the critical pathways of DOM participating in As mobilization under different geochemical scenarios.

Recent Findings

DOM constitutions in alpine riverine systems were distinct from downstream urbanized river basins due to the glacier degradation, atmosphere pollution, and permafrost thawing, etc. Notably, the diverse functional groups in DOM could potentially affect As mobility through triggering the As-bearing mineral transformation, changing As redox species, competitive adsorption, and the formation of surface complex species. The formation of the ternary DOM-Fe-As complex is also critical for controlling the As mobility in the water–sediment interface.

Summary

Future study should focus on the long-term and high-resolution monitoring of spatial-temporal variations in the concurrent transformations in DOM and As in alpine riverine systems, and it is urgent to utilize comprehensive characterization technologies in combination with state-of-the-art statistical analysis for quantitatively refining our understanding on the detailed mechanism accounting for the facilitation of DOM transformation on As enrichment in alpine riverine system, which is fundamental for developing remediation technologies for geogenic As enrichment and securing the safe drinking water supply in headwater regions globally.

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来源期刊
Current Pollution Reports
Current Pollution Reports Environmental Science-Water Science and Technology
CiteScore
12.10
自引率
1.40%
发文量
31
期刊介绍: Current Pollution Reports provides in-depth review articles contributed by international experts on the most significant developments in the field of environmental pollution.By presenting clear, insightful, balanced reviews that emphasize recently published papers of major importance, the journal elucidates current and emerging approaches to identification, characterization, treatment, management of pollutants and much more.
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