Mechanistic insights into iodine enrichment in groundwater during the transformation of iron minerals in aquifer sediments

Li, Junxia; Wang, Yuting; Xue, Xiaobin; Siebecker, Matthew G.; Sparks, Donald L.; Wang, Yanxin

doi:10.1016/j.scitotenv.2020.140922

Cited by 33 publications

(30 citation statements)

References 53 publications

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“…With increasing PVs through the aquifers, the concentrations of organic I were elevated for the entire depth profile (Figure G-I). Likewise, the rate of organic I accumulation was higher at the early stage due to the faster degradation of organic matter and the formation of iodinated organic compounds . Decreasing the production rate of organic I has led its concentration to approach a maximum that is constrained by the vertical flow velocity.…”

Section: Resultsmentioning

confidence: 99%

“…Likewise, the rate of organic I accumulation was higher at the early stage due to the faster degradation of organic matter and the formation of iodinated organic compounds. 5 Decreasing the production rate of organic I has led its concentration to approach a maximum that is constrained by the vertical flow velocity. The maximum was lower owing to greater dilution at faster groundwater flow and thus required fewer PVs to approach (e.g., 0.26 vs 0.41 μmol/L at 33 m depth, Figure 6I vs 6G).…”

Section: Prediction Of Iodine Spatiotemporal Variabilitymentioning

confidence: 99%

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

Xie

et al. 2022

Environ. Sci. Technol.

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The genesis of geogenic 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 SO 4 2− . 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 quasisteady 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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Section: Resultsmentioning

confidence: 99%

Section: Prediction Of Iodine Spatiotemporal Variabilitymentioning

confidence: 99%

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

Xie

et al. 2022

Environ. Sci. Technol.

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“…Oxidation iodine species (IO 3 − and organo-iodine) more occur in oxidizing and organic rich environments 2 , 17 . The stronger absorption capacity of oxidation iodine onto mineral surfaces 20 than I − makes the species to be dominant (contributing 64.30% ± 26.40% to total iodine content) in iodine-deficient areas (TI < 10 μg/L). The dispersed distribution of high iodate groundwater under varying geo-environmental zones is reflected by a poor correlation between IO 3 − and TI (R 2 = 0.19, P < 0.001) (Supplementary Fig.…”

Section: Spatial Distribution Of Iodine Speciationmentioning

confidence: 99%

“…Oxidation iodine (IO 3 − and organo-iodine), which often appear in a non-steady state, are more likely to exist under weak oxidizing thermodynamic conditions 16 commonly found in low-iodine groundwater. IO 3 − is more likely to bond with sediment rather than enrich groundwater 20 , and thus groundwater IO 3 − rarely exceeds the threshold at which oxidative damage occurs 21 . Different organo-iodine compounds can also comprise a significant fraction of TI 16 .…”

Section: Introductionmentioning

confidence: 99%

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Deficiency and excess of groundwater iodine and their health associations

Yan

Han

et al. 2022

Nat Commun

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More than two billion people worldwide have suffered thyroid disorders from either iodine deficiency or excess. By creating the national map of groundwater iodine throughout China, we reveal the spatial responses of diverse health risks to iodine in continental groundwater. Greater non-carcinogenic risks relevant to lower iodine more likely occur in the areas of higher altitude, while those associated with high groundwater iodine are concentrated in the areas suffered from transgressions enhanced by land over-use and intensive anthropogenic overexploitation. The potential roles of groundwater iodine species are also explored: iodide might be associated with subclinical hypothyroidism particularly in higher iodine regions, whereas iodate impacts on thyroid risks in presence of universal salt iodization exhibit high uncertainties in lower iodine regions. This implies that accurate iodine supply depending on spatial heterogeneity and dietary iodine structure optimization are highly needed to mitigate thyroid risks in iodine-deficient and -excess areas globally.

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A review of groundwater iodine mobilization, and application of isotopes in high iodine groundwater

Zheng,

Li,

et al. 2024

Environ Geochem Health

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Mechanistic insights into iodine enrichment in groundwater during the transformation of iron minerals in aquifer sediments

Cited by 33 publications

References 53 publications

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

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

Deficiency and excess of groundwater iodine and their health associations

A review of groundwater iodine mobilization, and application of isotopes in high iodine groundwater

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