大同盆地地下水中碳硫同位素组成特征及其对碘迁移富集的指示

朱沉静; 李俊霞; 谢先军

doi:10.3799/dqkx.2021.090

Volume 46 Issue 12

Dec. 2021

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Zhu Chenjing, Li Junxia, Xie Xianjun, 2021. Carbon and Sulfur Isotopic Features and Its Implications for Iodine Mobilization in Groundwater System at Datong Basin, Northern China. Earth Science, 46(12): 4480-4491. doi: 10.3799/dqkx.2021.090

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Zhu Chenjing, Li Junxia, Xie Xianjun, 2021. Carbon and Sulfur Isotopic Features and Its Implications for Iodine Mobilization in Groundwater System at Datong Basin, Northern China. Earth Science, 46(12): 4480-4491. doi: 10.3799/dqkx.2021.090

Citation:

Zhu Chenjing, Li Junxia, Xie Xianjun, 2021. Carbon and Sulfur Isotopic Features and Its Implications for Iodine Mobilization in Groundwater System at Datong Basin, Northern China. Earth Science, 46(12): 4480-4491. doi: 10.3799/dqkx.2021.090

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Carbon and Sulfur Isotopic Features and Its Implications for Iodine Mobilization in Groundwater System at Datong Basin, Northern China

doi: 10.3799/dqkx.2021.090

Zhu Chenjing^{1
,
,},
Li Junxia^{1, 2
,
,
,},
Xie Xianjun^{1, 2}

1.
School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
2.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430078, China

Received Date: 2021-04-08
Publish Date: 2021-12-15

Abstract

Abstract

In order to understand the dominant hydro-biogeochemical processes affecting the migration and transformation of iodine in groundwater system, in this study it analyzed the chemistry and carbon/sulfur isotope signatures of groundwater samples from typical high iodine area in Datong basin. Results show that the iodine concentrations of groundwater range from 14.40 to 1 030.00 μg/L and high iodine groundwater (I>100 μg/L) is mainly distributed in the discharge area near the center of the basin. The δ³⁴S_SO₄ and δ¹³C_DIC signatures of groundwater have the ranges of (-12.11‰)-(-9.79‰) and 4.04‰-16.63‰, respectively. The positive correlation between the δ¹³C_DIC values and DOC concentrations in groundwater suggests that microbial degradation of organic matter is one of the important sources of DIC in the Datong basin. The correlation between the low δ¹³C_DIC values and the high δ³⁴S_SO₄ values indicates that groundwater SO₄^2- serves as one of the electron accepters during the biodegradation of organic matter, and groundwater environment was dominant by the weak reducing conditions. High iodine groundwater is characterized by lower δ¹³C_DIC and higher δ³⁴S_SO₄, indicating that microbial degradation of organic matter, which acts as a dominate host of sediment iodine, promotes the release of iodine into groundwater. Moreover, the transformation among iodine species, for instance, from organic iodine/iodate to iodide, also favors the enrichment of groundwater iodine under the reducing conditions.
- iodine,
- groundwater,
- Datong basin,
- C/S isotopes,
- mobilization,
- hydrogeology

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References(47)

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Carbon and Sulfur Isotopic Features and Its Implications for Iodine Mobilization in Groundwater System at Datong Basin, Northern China

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