干旱区生态环境知识资源中心(Arid): Transport and migration of plutonium in different soil types and rainfall regimes

Arid

DOI	10.1016/j.jenvrad.2022.106883
	Transport and migration of plutonium in different soil types and rainfall regimes
	Cook, Megan; Kleinschmidt, Ross; Brugger, Joel; Wong, Vanessa N. L.
通讯作者	Cook, M
来源期刊	JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
ISSN	0265-931X
EISSN	1879-1700
出版年	2022
卷号	248
英文摘要	Leaching and transport of contaminants is a complex interacting system affected by a suite of environmental factors. This study demonstrates the potential significance of weather events and moisture movement when interpreting plutonium (Pu) migration and advective transport in the soil matrix. Using a column transport experiment, two soil types, a sandy soil and clay-rich soil, were spiked with Pu-238 as a tracer to observe the effect of simulated tropical and arid rainfall events on Pu mobility. Partition coefficients (Kd) were determined over a period of weeks and under varying rainfall rates to establish the impact of changing weather events on Pu mobility. The variability of these temporal Kds covers six orders of magnitude over a relatively brief time period. This demonstrates the necessity for non-static Kds to accurately describe Pu transport in these systems. The Pu Kds determined by these column transport experiments fall within the bounds of anticipated values (approximately 80-300,000 mL g(-1)) from immobile (magnitude 10(6) mL g(-1)) to moderately mobile (magnitude 10(1) mL g(-1)). The overall transport rate, shown by a decrease in calculated Kd, increases in environments where rainfall is more episodic, such as in arid regions as opposed to the consistently abundant rainfall in tropical regions. In contrast to the Pu-238 spike, Pu239+240 resulting from contamination from nuclear tests in the sandy soil (aged for > 30 years) showed higher mobility; we hypothesise that the ageing of the contamination, in particular Pu-bearing particles, accounts for this significant increase in Pu mobility. Low intensity, high frequency events in tropical sandy soil systems containing Pu particle contamination have the potential to mobilise Pu (> 10(5) decrease in calculated Kd) over shorter periods of weeks, and not years as previously assumed. This increased mobility, when applied to radioecological models using Kd as a site-specific parameter, shows that there is likely to be a continued impact (risk quotient > 1) on non-human biota in tropical sandy soil ecosystems.
英文关键词	Plutonium Kd Arid Tropical Transport Soil
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000799782700002
WOS关键词	SORPTION ; MONTMORILLONITE ; DESORPTION ; STABILITY ; COLLOIDS
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/2XILL650/393426
推荐引用方式 GB/T 7714	Cook, Megan,Kleinschmidt, Ross,Brugger, Joel,et al. Transport and migration of plutonium in different soil types and rainfall regimes[J],2022,248.
APA	Cook, Megan,Kleinschmidt, Ross,Brugger, Joel,&Wong, Vanessa N. L..(2022).Transport and migration of plutonium in different soil types and rainfall regimes.JOURNAL OF ENVIRONMENTAL RADIOACTIVITY,248.
MLA	Cook, Megan,et al."Transport and migration of plutonium in different soil types and rainfall regimes".JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 248(2022).