Microbial Contributions to Iodide Enrichment in Deep Groundwater in the North China Plain

Jiang, Zhou; Huang, Minghui; Jiang, Yongguang; Dong, Yiran; Shi, Liang; Li, Junxia; Wang, Yanxin

doi:10.1021/acs.est.2c06657

Cited by 14 publications

(16 citation statements)

References 58 publications

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“…It should be noted that in addition to SRB, the dissimilatory iodate-reducing bacteria could also contribute to the reduction of iodate to iodide in groundwater of the NCP, which was revealed by our previous results of groundwater metagenomes and heterologous expression of the detected dissimilatory iodate-reducing idrABP1P2 gene clusters in groundwater. 8 The concentrations of organic iodine in groundwater samples accounted for 0−18.8% of total iodine (Figure S1). Organic iodine was formed by the interaction of organic matter and those reactive intermediates during the transformation of iodine species, such as molecular iodine (I 2 ), hypoiodous acid (HIO), and triiodide (I 3 − ) through covalent attachments.…”

Section: Discussionmentioning

confidence: 99%

“…Thermodynamically, iodide is the dominant species in reducing and weakly alkaline geogenic high-iodine groundwater, while iodate and organic iodine are mainly bound to aquifer sediments. , Given the low affinity of iodide to solid matrices, microbially mediated reduction of iodate is considered to be the main mechanism for iodide generation and enrichment in groundwater. − To date, dissimilatory iodate-reducing bacteria and iron-reducing bacteria have been found to reduce iodate to iodide. For instance, dissimilatory iodate-reducing Denitromonas sp.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, ferrous iron is able to reduce iodate abiotically . Given the detection of IdrABP1P2 and the absorption of iodine into iron minerals in aquifers, dissimilatory iodate-reducing bacteria and iron-reducing bacteria were proposed to contribute to iodate reduction and iodide enrichment in groundwater. , …”

Section: Introductionmentioning

confidence: 99%

“…14 Given the detection of IdrABP1P2 and the absorption of iodine into iron minerals in aquifers, dissimilatory iodatereducing bacteria and iron-reducing bacteria were proposed to contribute to iodate reduction and iodide enrichment in groundwater. 8,15 As an important representative of underground microbial populations, sulfate-reducing bacteria (SRB) widely exist in groundwater discharge areas and play a crucial role in the mobilization of toxic substances such as arsenic, uranium, and petroleum hydrocarbons in aquifers. 16−18 However, the role of SRB in iodine mobilization in geogenic iodine-rich groundwater systems has not been elucidated.…”

Section: Introductionmentioning

confidence: 99%

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Bacterial Sulfate Reduction Facilitates Iodine Mobilization in the Deep Confined Aquifer of the North China Plain

Jiang,

Qian,

Cui

et al. 2023

Environ. Sci. Technol.

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Bacterial sulfate reduction plays a crucial role in the mobilization of toxic substances in aquifers. However, the role of bacterial sulfate reduction on iodine mobilization in geogenic high-iodine groundwater systems has been unexplored. In this study, the enrichment of groundwater δ34SSO4 (15.56 to 69.31‰) and its significantly positive correlation with iodide and total iodine concentrations in deep groundwater samples of the North China Plain suggested that bacterial sulfate reduction participates in the mobilization of groundwater iodine. Similar significantly positive correlations were further observed between the concentrations of iodide and total iodine and the relative abundance of the dsrB gene by qPCR, as well as the composition and abundance of sulfate-reducing bacteria (SRB) predicted from 16S rRNA gene high-throughput sequencing data. Subsequent batch culture experiments by the SRB Desulfovibrio sp. B304 demonstrated that SRB could facilitate iodine mobilization through the enzyme-driven biotic and sulfide-driven abiotic reduction of iodate to iodide. In addition, the dehalogenation of organoiodine compounds by SRB and the reductive dissolution of iodine-bearing iron minerals by biogenic sulfide could liberate bound or adsorbed iodine into groundwater. The role of bacterial sulfate reduction in iodine mobilization revealed in this study provides new insights into our understanding of iodide enrichment in iodine-rich aquifers worldwide.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bacterial Sulfate Reduction Facilitates Iodine Mobilization in the Deep Confined Aquifer of the North China Plain

Jiang,

Qian,

Cui

et al. 2023

Environ. Sci. Technol.

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“…47,48 Our recent metagenomic study detected the presence of mtrCAB and dmsEFAB in high iodine groundwater in the North China Plain. 11 Thus, the abiotic or biotic reduction of IO 3…”

Section: Environmental Significancementioning

confidence: 99%

Abiotic and Biotic Reduction of Iodate Driven by Shewanella oneidensis MR-1

Jiang,

Cui,

Qian

et al. 2023

Environ. Sci. Technol.

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Iodate (IO3 –) can be abiotically reduced by Fe(II) or biotically reduced by the dissimilatory Fe(III)-reducing bacterium Shewanella oneidensis (MR-1) via its DmsEFAB and MtrCAB. However, the intermediates and stoichiometry between the Fe(II) and IO3 – reaction and the relative contribution of abiotic and biotic IO3 – reduction by biogenic Fe(II) and MR-1 in the presence of Fe(III) remain unclear. In this study, we found that abiotic reduction of IO3 – by Fe(II) produced intermediates HIO and I– at a ratio of 1:2, followed by HIO disproportionation to I– and IO3 –. Comparative analyses of IO3 – reduction by MR-1 wild type (WT), MR-1 mutants deficient in DmsEFAB or MtrCAB, and Shewanella sp. ANA-3 in the presence of Fe(III)-citrate, Fe(III) oxides, or clay minerals showed that abiotic IO3 – reduction by biogenic Fe(II) predominated under iron-rich conditions, while biotic IO3 – reduction by DmsEFAB played a more dominant role under iron-poor conditions. Compared to that in the presence of Fe(III)-citrate, MR-1 WT reduced more IO3 – in the presence of Fe(III) oxides and clay minerals. The observed abiotic and biotic IO3 – reduction by MR-1 under Fe-rich and Fe-limited conditions suggests that Fe(III)-reducing bacteria could contribute to the transformation of iodine species and I– enrichment in natural iodine-rich environments.

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Effects of iodine content on the hydrochemical characteristics and microbial community structure of groundwater in coastal zone: A case study of Bailang River Basin

Cao,

Li,

Yang

et al. 2024

Water Environment Research

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Iodine is an important component of the thyroid gland, producing hormones. Excess iodine can trigger autoimmune thyroid disease. The salt–freshwater interaction zone of the coastal aquifer is affected by seawater intrusion, and the physical and chemical environment is constantly changing. Exploring the characteristics and influencing factors of high‐iodine groundwater in coastal areas play an important role in the prevention and control of groundwater pollution. In this study, the hydrochemical characteristics of high‐iodine groundwater were analyzed. The interrelationship between the water's chemical components was revealed, and the microbial community composition under different iodine concentration gradients in the groundwater was examined using 16sRNA high‐throughput sequencing. The influence of water quality on microbial distribution was also explored. The results showed that the iodine content in the Bailang River Basin ranged from 31 to 1776 μg/L, and the high‐iodine groundwater samples accounted for 67.7%, with uneven spatial distribution. Groundwater samples with different iodine concentrations were grouped and compared, and there was no significant difference in the diversity and richness of microbial communities. At the genus level, iodine concentrations were significantly correlated with Sediminibacterium and Thauera. In addition to iodine, nitrates and sulfates also have a significant effect on microbial communities.Practitioner Points Groundwater in the south bank of Laizhou Bay is predominantly alkaline, with uneven spatial distribution of iodine content. As the concentration of iodide increases, the groundwater chemical type tends towards Na‐Cl type. The concentration of iodine has little effect on the richness and diversity of microbial communities. The concentrations of sulfate, nitrate, and nitrite also affect the microbial structure and species diversity of groundwater.

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Microbial Contributions to Iodide Enrichment in Deep Groundwater in the North China Plain

Cited by 14 publications

References 58 publications

Bacterial Sulfate Reduction Facilitates Iodine Mobilization in the Deep Confined Aquifer of the North China Plain

Bacterial Sulfate Reduction Facilitates Iodine Mobilization in the Deep Confined Aquifer of the North China Plain

Abiotic and Biotic Reduction of Iodate Driven by Shewanella oneidensis MR-1

Effects of iodine content on the hydrochemical characteristics and microbial community structure of groundwater in coastal zone: A case study of Bailang River Basin

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