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DOI | 10.1038/s41467-020-16104-z |
Arsenic contamination of Bangladesh aquifers exacerbated by clay layers | |
Ivan Mihajlov; M. Rajib H. Mozumder; Benjamí; n C. Bostick; Martin Stute; Brian J. Mailloux; Peter S. K. Knappett; Imtiaz Choudhury; Kazi Matin Ahmed; Peter Schlosser; Alexander van Geen | |
2020-05-07 | |
发表期刊 | Nature |
出版年 | 2020 |
英文摘要 | Confining clay layers typically protect groundwater aquifers against downward intrusion of contaminants. In the context of groundwater arsenic in Bangladesh, we challenge this notion here by showing that organic carbon drawn from a clay layer into a low-arsenic pre-Holocene (>12 kyr-old) aquifer promotes the reductive dissolution of iron oxides and the release of arsenic. The finding explains a steady rise in arsenic concentrations in a pre-Holocene aquifer below such a clay layer and the repeated failure of a structurally sound community well. Tritium measurements indicate that groundwater from the affected depth interval (40鈥?0鈥塵) was recharged >60 years ago. Deeper (55鈥?5鈥塵) groundwater in the same pre-Holocene aquifer was recharged only 10鈥?0 years ago but is still low in arsenic. Proximity to a confining clay layer that expels organic carbon as an indirect response to groundwater pumping, rather than directly accelerated recharge, caused arsenic contamination of this pre-Holocene aquifer. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249430 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Ivan Mihajlov,M. Rajib H. Mozumder,Benjamí,et al. Arsenic contamination of Bangladesh aquifers exacerbated by clay layers[J]. Nature,2020. |
APA | Ivan Mihajlov.,M. Rajib H. Mozumder.,Benjamí.,n C. Bostick.,Martin Stute.,...&Alexander van Geen.(2020).Arsenic contamination of Bangladesh aquifers exacerbated by clay layers.Nature. |
MLA | Ivan Mihajlov,et al."Arsenic contamination of Bangladesh aquifers exacerbated by clay layers".Nature (2020). |
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