Determination of 129I in waters associated with coalbed methane using solvent extraction and accelerator mass spectrometry measurement

Chen, Ning; Zhou, Weijian; Fan, Yukun; Zhang, Luyuan; Xing, Shu; Liu, Qi; Hou, Xiaolin

doi:10.1007/s10967-022-08679-2

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…This corresponds to the iodine isotopic signature of coal. In particular, coal, being the product of sedimentary rocks that have been in place for millions or even billions of years, has 129 I that decay to levels below detection limits . The addition of iodine released from coal theoretically reduces the 129 I/ 127 I in aerosols.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, coal, being the product of sedimentary rocks that have been in place for millions or even billions of years, 36 has 129 I that decay to levels below detection limits. 37 The addition of iodine released from coal theoretically reduces the 129 I/ 127 I in aerosols. Accordingly, as calculated by the PMF model, coal combustion contributed 72.7, 47.0, 37.0, and 52.5% of iodine to PM 2.5 in Changchun, Beijing, Chengdu, and Hong Kong, respectively, indicating the dominant contribution of coal combustion (Figure 5).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Isotopic Evidence Unveils Fossil Fuels Contribution to Atmospheric Iodine

Fan,

Xu,

Hou

et al. 2023

Environ. Sci. Technol.

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Iodine is a crucial nutrient for public health, and its presence in the terrestrial atmosphere is a key factor in determining the prevalence of iodine deficiency disorders. While oceanic iodine emissions decrease at lower sea surface temperatures, the primary contributors to atmospheric iodine can vary from oceanic sources in the summer to other sources in winter. However, the specific sources and their respective contributions have remained unexplored. Fortunately, the atomic ratio of 129 I to 127 I significantly differs between nuclear activity and fossil fuels like coal and petroleum, which formed millions to billions of years ago. This distinction makes 129 I a valuable tool for identifying iodine sources. In our study, we analyzed iodine isotopes and incorporated additional indicators such as element content in PM 2.5 samples. Our findings reveal, for the first time, that in winter inland areas, fuel oil, alongside coal combustion, is a significant source of atmospheric iodine. This research enhances our comprehension of the impact of human activities on iodine levels in the environment. This understanding is crucial not only for addressing iodine deficiency-related health concerns but also for comprehending stratospheric ozone depletion, a phenomenon closely associated with atmospheric iodine.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Isotopic Evidence Unveils Fossil Fuels Contribution to Atmospheric Iodine

Fan,

Xu,

Hou

et al. 2023

Environ. Sci. Technol.

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Chemical characteristics, formation mechanisms, and geological evolution processes of high-salinity coal reservoir water in the Binchang area of the southern Ordos Basin, China

Lin,

Wang,

Qiao

et al. 2024

International Journal of Coal Geology

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Chronological Study of Coal‐seam Water and its Implication on Gas Production in the South Qinshui Basin

CHEN,

FANG,

LANG

et al. 2024

Acta Geologica Sinica (Eng)

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The knowledge of the residence time of formation water is fundamental to understanding the subsurface flow and hydrological setting. To better identify the origin and evolution of coal seam water and its impact on gas storage and production, this study collected coalbed methane co‐produced water in the southeast Qinshui Basin and detected chemical and isotopic compositions, especially 36Cl and 129I concentrations. The calculated tracer ages of 129I (5.2–50.6 Ma) and 36Cl (0.13–0.76 Ma) are significantly younger than the age of coal‐bearing formation (Pennsylvanian ‐ Cisuralian), indicating freshwater recharge after coal deposition. The model that utilises 129I/I and 36Cl/Cl ratios to constrain the timing of recharge and the proportion of recharge water reveals that over 60% of pre‐anthropogenic meteoric water entered coal seams since 10 Ma and mixed with residue initial deposition water, corresponding to the basin inversion in Cenozoic. The spatial distribution of major ion concentrations reveals the primary recharge pathway for meteoric water from coal outcrops at the eastern margin to the basin center. This study demonstrates the occurrence of higher gas production rates from wells that accept water recharge in recent times and suggests the possible potential of the non‐stagnant zones for high gas production.

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Determination of 129I in waters associated with coalbed methane using solvent extraction and accelerator mass spectrometry measurement

Cited by 3 publications

References 31 publications

Isotopic Evidence Unveils Fossil Fuels Contribution to Atmospheric Iodine

Isotopic Evidence Unveils Fossil Fuels Contribution to Atmospheric Iodine

Chemical characteristics, formation mechanisms, and geological evolution processes of high-salinity coal reservoir water in the Binchang area of the southern Ordos Basin, China

Chronological Study of Coal‐seam Water and its Implication on Gas Production in the South Qinshui Basin

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