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    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

    朱沉静, 李俊霞, 谢先军, 2021. 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. 地球科学, 46(12): 4480-4491. doi: 10.3799/dqkx.2021.090
    引用本文: 朱沉静, 李俊霞, 谢先军, 2021. 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. 地球科学, 46(12): 4480-4491. doi: 10.3799/dqkx.2021.090
    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

    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

    doi: 10.3799/dqkx.2021.090
    基金项目: 

    国家自然科学基金项目 42020104005

    国家自然科学基金项目 41502230

    详细信息
      作者简介:

      朱沉静(1997-), 硕士研究生, 主要从事地下水污染与防治等方面的研究工作.ORCID: 0000-0002-3234-4153.E-mail: chenj_zhu@cug.edu.cn

      通讯作者:

      李俊霞, ORCID: 0000-0001-5191-3166.E-mail: jxli@cug.edu.cn

    • 中图分类号: P641

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

    • 摘要: 为深入探究地下水系统中影响碘迁移转化的主控水文生物地球化学过程,对大同盆地典型高碘地下水区完成样品采集,分析地下水样品基础理化性质及碳硫同位素组成特征.结果表明,大同盆地地下水碘含量变化范围为14.40~1 030.00 μg/L,高碘地下水(I>100 μg/L)主要分布在盆地中心排泄区.地下水中溶解性无机碳的δ13CDIC值变化范围为-12.11‰~-9.79‰,硫酸盐δ34SSO4值介于4.04‰~16.63‰.δ13CDIC和DOC之间存在较明显的正相关关系,表明有机质的微生物降解过程是区域地下水无机碳的重要来源之一.同时,δ13CDIC与δ34SSO4一定的负相关关系表明硫酸盐是有机质微生物降解过程中潜在电子受体之一,且地下水水环境以偏还原环境为主.高碘地下水表现出低δ13CDIC、高δ34SSO4的同位素特征,表明有机质的微生物降解过程是控制地下水中碘迁移释放的主要过程之一,与该过程相伴而生的碘形态转化进一步促使碘以碘离子的形式在偏还原的地下水环境中发生富集.

       

    • 图  1  大同盆地研究区采样点位置与地下水碘含量概况

      绿色线表示河流

      Fig.  1.  Sampling location of groundwater samples from Datong basin

      图  2  Piper三线图

      Fig.  2.  Piper diagram of groundwater samples from Datong basin

      图  3  地下水碘含量垂向分布图

      Fig.  3.  Depth profile of iodine concentrations in groundwater samples

      图  4  地下水DOC与δ13CDIC(a)、HCO3-(b)关系图

      Fig.  4.  The plots of groundwater DOC vs. δ13CDIC(a), DOC vs. HCO3-(b)

      图  5  地下水δ34S$ {}_{\mathrm{S}{\mathrm{O}}_{4}} $与SO42-/ Cl-(a)、δ13CDIC (b)关系图

      Fig.  5.  The plots of groundwater δ34S$ {}_{\mathrm{S}{\mathrm{O}}_{4}} $ vs. SO42-/Cl-(a), δ34S$ {}_{\mathrm{S}{\mathrm{O}}_{4}} $ vs. δ13CDIC (b)

      图  6  碘含量I与δ13CDIC(a)、δ34S$ {}_{\mathrm{S}{\mathrm{O}}_{4}} $(b)关系图

      Fig.  6.  The plots of groundwater iodine I vs. δ13CDIC(a), I vs. δ34S$ {}_{\mathrm{S}{\mathrm{O}}_{4}} $(b)

      表  1  研究区地下水主要水化学组分统计

      Table  1.   Statistics of groundwater chemistry compositions in the study area

      样品编号 深度(m) 总碘(μg/L) δ13CDIC (‰) δ34S$ {}_{\mathrm{S}{\mathrm{O}}_{4}} $ (‰) pH Eh (mV) 方解石SI 白云石SI 石膏SI DOC (mg/L) Fetot (mg/L) K++Na+ (mg/L) Ca2+ (mg/L) Mg2+ (mg/L) HCO3- (mg/L) SO42- (mg/L) Cl- (mg/L) EC (μS/cm)
      Ⅰ区 DT13-01 - 17.50 -9.79 4.41 8.59 37.70 1.19 2.19 -1.61 3.15 2.17 13.57 68.22 13.39 221.2 110.7 11.46 537
      DT13-02 - 75.90 -10.75 10.12 7.30 -34.60 0.65 1.09 -0.83 2.67 1.59 30.59 221.5 61.62 543.2 404.4 123.4 1 542
      DT13-22 30 21.10 -12.11 4.30 7.81 12.90 0.46 1.02 -1.53 3.09 0.04 35.12 104.5 53.51 316.3 137.8 170.8 1 046
      DT13-23 60 14.40 -11.77 4.04 7.75 -10.10 0.55 1.13 -2.13 1.53 0.04 22.29 58.21 27.14 456.3 44.32 18.14 540
      Ⅱ区 DT13-08 60 1 030 -7.59 9.42 7.44 -16.40 0.51 2.09 -1.07 15.6 0.07 1 016 124.8 633.9 878.7 1 677 2 398 9 231
      DT13-13 48 201.0 -14.20 11.21 7.88 -53.00 0.68 1.82 -1.91 4.52 0.48 400.8 30.13 39.27 1 014 246.3 178.0 2 151
      DT13-14 50 96.10 -13.13 11.15 7.76 -11.00 0.64 1.63 -1.74 3.43 0.22 185.9 49.66 48.65 755.8 191.3 104.4 1 340
      DT13-15 70 637.0 -12.36 11.09 8.01 -138.4 0.73 2.15 -1.64 4.36 0.90 516.3 37.11 80.01 804.2 514.2 501.5 3 117
      DT13-16 18 50.10 -10.37 8.96 8.13 -33.40 0.56 1.92 -2.07 7.29 0.17 561.6 14.30 39.27 1 093 447.9 313.2 3 009
      DT13-21 25 151.0 -13.26 6.89 8.03 29.30 0.63 1.89 -2.33 2.79 0.48 156.1 26.94 51.37 641.7 86.41 105.0 1 200
      DT13-24 30 17.40 -9.70 12.09 7.26 46.30 0.32 1.26 -1.41 4.43 0.02 190.2 95.42 177.4 654.8 383.9 358.9 2 649
      DT13-25 - 158.0 -8.61 16.63 8.93 16.50 0.95 2.54 -1.55 2.02 0.07 545.0 25.82 49.55 298.9 783.8 566.1 3 034
      Ⅲ区 DT13-04 75 934.0 -16.93 - 8.30 -102.0 0.20 1.43 -4.11 38.1 0.36 366.7 3.30 15.11 1 305 12.01 170.8 1 689
      DT13-10 19 479.0 -13.60 13.28 8.28 -2.70 0.52 1.71 -2.58 7.56 0.03 418.7 8.23 16.57 1 230 178.8 173.0 1 940
      DT13-12 52 151.0 -9.09 - 8.53 -38.50 0.28 1.66 -4.06 27.0 0.28 297.6 2.86 14.81 1 080 13.22 112.6 1 505
      DT13-17 20 143.0 -10.77 13.01 7.28 28.10 0.66 1.71 -0.13 12.9 0.09 1 066 453.6 514.9 570.7 4 206 1 142 8 812
      DT13-19 35 31.10 -13.90 11.35 7.70 72.50 0.44 1.66 -2.13 3.70 0.02 106.5 48.97 131.7 513.9 113.7 194.9 1 715
      DT13-26 16 125.0 -8.42 11.66 8.10 3.80 0.45 1.53 -2.15 2.22 0.05 152.0 23.08 43.70 383.1 148.4 114.7 1 164
      DT13-27 30 439.0 -12.97 15.48 7.63 -88.70 0.87 2.61 -0.56 17.2 - 1 974 227.9 750.9 755.4 3 521 3 301 10 339
      DT13-29 - 18.80 -7.36 - 8.29 - 0.42 1.68 -2.48 2.71 - 75.53 13.58 41.22 409.3 101.7 24.07 838
      DT13-30 28 30.90 -7.85 - 7.91 -35.60 0.31 1.15 -2.51 2.19 0.06 156.8 33.71 50.45 301.5 47.72 144.1 1 409
      注:-.水样的浓度低于检测限;SI.正值表示处于过饱和状态,负值表示处于未饱和状态.
      下载: 导出CSV
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