Use of carbon-14 labeled trichloroethene to assess degradation potential in rock core microcosms.

IF 8.2 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment Pub Date : 2024-12-20 Epub Date: 2024-11-18 DOI:10.1016/j.scitotenv.2024.177540

Hao Wang, Rong Yu, Ramona Darlington Iery, David L Freedman

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引用次数: 0

Abstract

In fractured rock aquifers contaminated with trichloroethene (TCE), the extent of groundwater plumes is impacted by degradation occurring within the rock matrix. The objective of this study was to evaluate TCE degradation in rock samples from three sites where in situ conditions may favor natural or enhanced attenuation. Intact rock core microcosms (94 total) were used to assess in situ conditions and enhancement by addition of lactate or lactate + sulfate. A key advance for this study was inclusion of carbon-14 (¹⁴C) labeled TCE in the experimental design, which enables monitoring of ¹⁴C-labeled products in addition to more readily detectable compounds associated with TCE degradation (i.e., cis-1,2-dichloroethene (cDCE), vinyl chloride, acetylene, ethene, and ethane). ¹⁴C-labeled products comprised 35-95 % of the total degradation products recovered over 9-21 months of monitoring, indicating that inclusion of ¹⁴C-TCE was essential to capturing the full potential for abiotic and biotic degradation of TCE. Microcosms infused with TCE but not ¹⁴C-TCE exhibited enrichment in δ¹³C-TCE, and enrichment in δ¹³C-cDCE in microcosms that underwent reductive dechlorination of TCE to cDCE. The results demonstrate the advantages of using diffusion-transport microcosms and ¹⁴C-TCE to document degradation of chlorinated ethenes in fractured rock aquifers.

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使用碳-14 标记的三氯乙烯评估岩芯微生态系统的降解潜力。

在受到三氯乙烯（TCE）污染的断裂岩含水层中，地下水羽流的范围受到岩石基质内发生的降解作用的影响。本研究的目的是评估三氯乙烯在三个地点的岩石样本中的降解情况，这些地点的原位条件可能有利于自然或强化衰减。使用完整岩芯微观模拟（共 94 个）来评估原位条件以及添加乳酸盐或乳酸盐+硫酸盐后的增强效果。本研究的一项重要进展是在实验设计中加入了碳-14 (14C) 标记的 TCE，这样除了可以监测与 TCE 降解相关的更容易检测到的化合物（即顺式-1,2-二氯乙烯 (cDCE)、氯乙烯、乙炔、乙烯和乙烷）外，还可以监测 14C 标记的产物。在 9-21 个月的监测过程中，14C 标记的降解产物占总降解产物回收量的 35-95%，这表明，要充分捕捉 TCE 的非生物和生物降解潜力，就必须将 14C-TCE 包括在内。注入了 TCE 但未注入 14C-TCE 的微生态系统显示出 δ13C-TCE 的富集，而在 TCE 还原脱氯为 cDCE 的微生态系统中，δ13C-cDCE 的富集。这些结果表明，利用扩散传输微观模拟和 14C-TCE 来记录断裂岩含水层中氯化醚的降解情况具有优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science of the Total Environment 环境科学-环境科学

CiteScore

17.60

自引率

10.20%

发文量

8726

审稿时长

2.4 months

期刊介绍： The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.