Spatiotemporal Variability of Groundwater Iodine in the Northern Arid Basins: Significance for Safe Water Supply

Kunfu Pi; Junxia Li; Philippe Van Cappellen

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Spatiotemporal Variability of Groundwater Iodine in the Northern Arid Basins: Significance for Safe Water Supply

机译：Spatiotemporal Variability of Groundwater Iodine in the Northern Arid Basins: Significance for Safe Water Supply

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The genesis of geogenie iodine (i)-contaminated groundwater poses a significant threat to long-term water exploitation. Safe and sustainable water supply, particularly in the northern arid basins, demands a quantitative prediction of the high variability of I distribution over hydrogeological timescales. Here, bioenergetics-informed reactive transport modeling was combined with high-resolution molecular characterization of fueling organic matter to decipher the time-controlled interactions between vertical flow and (bio)geochemical processes in I transport within the Datong aquifers. The declining reactivities of I-bearing organic matter and Fe oxides in the 15—40 m depth decreased the rate of I release, while a growing number of pore volumes flushed through the aquifers to leach out I~ and organic I. This removal effect is compensated by the desorption of I~ from Fe oxides and secondary FeS generated from the concurrent reduction of Fe oxides and S042_. Consequently, peak concentrations of groundwater I~ may have appeared, depending upon the vertical recharge rate, at the first several pore volumes flushed through the aquifers. The current vertical distributions of the various I species likely represent a quasi-steady state between I mobilization and leaching. These new mechanistic insights into the dynamic hydrogeological— (bio)geochemical processes support secure groundwater use in the I-affected northern arid basins.

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来源
《Environmental Science & Technology: ES&T》 |2023年第1期|340-349|共10页
作者
Kunfu Pi; Junxia Li; Philippe Van Cappellen;
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作者单位

School of Environmental Studies, China University of Geosciences, 430074 Wuhan, China;

Ecohydrology Research Group, Department of Earth and Environmental Sciences, University of Waterloo, N2L 3G1 Waterloo, Canada;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
iodine; geogenie contaminated groundwater; bioenergetics-informed modeling redox zonation; risk prediction; water supply;

Spatiotemporal Variability of Groundwater Iodine in the Northern Arid Basins: Significance for Safe Water Supply

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