Elevated Radium Activity in a Hydrocarbon-Contaminated Aquifer,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Elevated Radium Activity in a Hydrocarbon-Contaminated Aquifer
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-06-07 , DOI: 10.1021/acs.est.2c09118
Amy K Wiersma ₁ , Glen Hook ₂ , Madeleine Mathews ₃ , Sean R Scott ₄ , Jessica R Meyer ₅ , Beth L Parker ₂ , Matthew Ginder-Vogel ₁

Affiliation

Hydrocarbon spills that reach the subsurface can modify aquifer geochemical conditions. Biogeochemical zones typically form proximal to the source zone that include iron (Fe(III)) and manganese (Mn(III/IV)) (hydr)oxide reduction, with potential to release associated geogenic contaminants to groundwater. Here, multi-level monitoring systems are used to investigate radium (²²⁶Ra, ²²⁸Ra) activities in an aquifer contaminated with a mixture of chlorinated solvents, ketones, and aromatics occurring as a dense non-aqueous phase liquid in the source zone. ²²⁶Ra activities are up to 10 times higher than background 60 m downgradient from the source zone, where pH is lower, total dissolved solid concentrations are higher, and conditions are methanogenic. Correlations indicate that Fe and Mn (hydr)oxide reduction and sorption site competition are likely responsible for elevated Ra activities within the dissolved phase plume. ²²⁶Ra activities return to background within the Fe(III)/SO₄^2–-reducing zone 600 m downgradient from the source, near the middle of the dissolved phase plume. Geochemical models indicate that sorption to secondary phases (e.g., clays) is important in sequestering Ra within the plume. Although maximum Ra activities within the plume are well below the U.S. drinking water standard, elevated activities compared to background emphasize the importance of investigating Ra and other trace elements at hydrocarbon-impacted sites.

中文翻译：

受碳氢化合物污染的含水层中镭的活度升高

到达地下的碳氢化合物泄漏可以改变含水层的地球化学条件。生物地球化学区域通常形成于源区域附近，其中包括铁 (Fe(III)) 和锰 (Mn(III/IV))（氢）氧化物还原，有可能将相关的地质污染物释放到地下水中。在这里，多级监测系统用于研究被氯化溶剂、酮和芳香族化合物的混合物污染的含水层中的镭（ ²²⁶ Ra、^{228 Ra）活动，这些混合物在源区以致密的非水相液体形式出现。}²²⁶Ra 活性比源区下降 60 m 处的背景高出 10 倍，该区域 pH 值较低，总溶解固体浓度较高，且条件是产甲烷的。相关性表明，Fe 和 Mn（氢）氧化物还原和吸附位点竞争可能是溶解相羽流内 Ra 活性升高的原因。²²⁶ Ra 活动返回 Fe(III)/SO ₄^{2–内的背景}- 还原区距源头向下 600 m，靠近溶解相羽流的中部。地球化学模型表明，第二相（例如粘土）的吸附对于将 Ra 隔离在羽流中非常重要。尽管羽流内的最大 Ra 活性远低于美国饮用水标准，但与背景相比，较高的活性强调了在受碳氢化合物影响的地点调查 Ra 和其他微量元素的重要性。

更新日期：2023-06-07

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南