干旱区生态环境知识资源中心(Arid): Radionuclide transport in fractured chalk under abrupt changes in salinity

Arid

DOI	10.1016/j.scitotenv.2023.168636
	Radionuclide transport in fractured chalk under abrupt changes in salinity
	Turkeltaub, Tuvia; Weisbrod, Noam; Zavarin, Mavrik; Chang, Elliot; Kersting, Annie B.; Teutsch, Nadya; Roded, Sari; Tran, Emily L.; Geller, Yehonatan; Gerera, Yarden; Klein-BenDavid, Ofra
通讯作者	Turkeltaub, T
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2024
卷号	912
英文摘要	Internationally, it has been agreed that geologic repositories for spent fuel and radioactive waste are considered the internationally agreed upon solution for intermediate and long-term disposal. In countries where traditional nuclear waste repository host rocks (e.g., clay, salt, granite) are not available, other low permeability lithologies must be studied. Here, chalk is considered to determine its viability for disposal. Despite chalk's low bulk permeability, it may contain fracture networks that can facilitate radionuclide transport. In arid areas, groundwater salinity may change seasonally due to the mixing between brackish groundwater and fresh meteoric water. Such salinity changes may impact the radionuclides' mobility. In this study, radioactive U(VI) and radionuclide simulant tracers (Sr, Ce and Re) were injected into a naturally fractured chalk core. The mobility of tracers was investigated under abrupt salinity variations. Two solutions were used: a low ionic strength (IS) artificial rainwater (ARW; IS similar to 0.002) and a high IS artificial groundwater (AGW; IS similar to 0.2). During the experiments, the tracers were added to ARW, then the carrier was changed to AGW, and vice versa. Ce was mobile only in colloidal form, while Re was transported as a conservative tracer. Both Re and Ce demonstrated no change in mobility due to salinity changes. In contrast, U and Sr showed increased mobility when AGW was introduced and decreased mobility when ARW was introduced into the core. These experimental results, supported by reactive transport modeling, suggest that saline groundwater solutions promote U and Sr release via ion-exchange and enhance their migration in fractured chalk. The study emphasizes the impact of salinity variations near spent fuel repositories and their possible impact on radionuclide mobility.
英文关键词	Radionuclides Ionic strength Carbonate rocks Reactive transport Strontium Uranium Cerium
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001134131100001
WOS关键词	PLUTONIUM TRANSPORT ; IONIC-STRENGTH ; PARTICLE-SIZE ; VADOSE ZONE ; WATER-FLOW ; SORPTION ; COLLOIDS ; URANIUM ; IMPACT ; ADSORPTION
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405444
推荐引用方式 GB/T 7714	Turkeltaub, Tuvia,Weisbrod, Noam,Zavarin, Mavrik,et al. Radionuclide transport in fractured chalk under abrupt changes in salinity[J],2024,912.
APA	Turkeltaub, Tuvia.,Weisbrod, Noam.,Zavarin, Mavrik.,Chang, Elliot.,Kersting, Annie B..,...&Klein-BenDavid, Ofra.(2024).Radionuclide transport in fractured chalk under abrupt changes in salinity.SCIENCE OF THE TOTAL ENVIRONMENT,912.
MLA	Turkeltaub, Tuvia,et al."Radionuclide transport in fractured chalk under abrupt changes in salinity".SCIENCE OF THE TOTAL ENVIRONMENT 912(2024).