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江汉平原高砷地下水稳定碳同位素特征及其指示意义

袁晓芳 邓娅敏 杜尧 甘义群

袁晓芳, 邓娅敏, 杜尧, 甘义群. 江汉平原高砷地下水稳定碳同位素特征及其指示意义[J]. 地质科技通报, 2020, 39(5): 156-163. doi: 10.19509/j.cnki.dzkq.2021.0008
引用本文: 袁晓芳, 邓娅敏, 杜尧, 甘义群. 江汉平原高砷地下水稳定碳同位素特征及其指示意义[J]. 地质科技通报, 2020, 39(5): 156-163. doi: 10.19509/j.cnki.dzkq.2021.0008
Yuan Xiaofang, Deng Yamin, Du Yao, Gan Yiqun. Characteristics of stable carbon isotopes and its implications on arsenic enrichment in shallow groundwater of the Jianghan Plain[J]. Bulletin of Geological Science and Technology, 2020, 39(5): 156-163. doi: 10.19509/j.cnki.dzkq.2021.0008
Citation: Yuan Xiaofang, Deng Yamin, Du Yao, Gan Yiqun. Characteristics of stable carbon isotopes and its implications on arsenic enrichment in shallow groundwater of the Jianghan Plain[J]. Bulletin of Geological Science and Technology, 2020, 39(5): 156-163. doi: 10.19509/j.cnki.dzkq.2021.0008

江汉平原高砷地下水稳定碳同位素特征及其指示意义

doi: 10.19509/j.cnki.dzkq.2021.0008
基金项目: 

国家自然科学基金项目 41977174

详细信息
    作者简介:

    袁晓芳(1995-), 女, 现正攻读水文地质学专业硕士学位, 主要从事地下水污染与防治、地下水中有机质对砷迁移转化的影响等方面的研究工作。E-mail:yuanxiaofang1995@163.com

    通讯作者:

    邓娅敏(1980-), 女, 教授, 主要从事地下水污染与防治、水岩相互作用及其环境效应等方面的教学与研究工作。E-mail:yamin.deng@cug.edu.cn

  • 中图分类号: X142

Characteristics of stable carbon isotopes and its implications on arsenic enrichment in shallow groundwater of the Jianghan Plain

  • 摘要: 溶解性有机碳(DOC)是地下水中砷释放过程的关键因素,为查明江汉平原高砷地下水稳定碳同位素特征,识别有机质的降解过程对砷富集的影响,采用稳定碳同位素分析测试技术并结合地下水化学特征,对江汉平原典型砷中毒病区的浅层地下水进行了区域采样分析。结果表明:浅层承压水的砷质量浓度为0.23~2 621 μg/L。地表水较地下水具有更负的δ13CDOCδ13CDIC值。地下水中溶解性无机碳(DIC)的δ13CDIC值在-11.9‰~-3.99‰之间,溶解性有机碳的δ13CDOC值在-28.5‰~-19.6‰之间。地下水的δ13CDIC-δ13CDOC差值与ρ(As)呈一定负相关关系,表明微生物作用下有机质的降解促进了As的富集。δ13CDIC-δ13CDOC差值与δ13CDICρ(DOC)均具有较显著的正相关关系,表明地下水中有机质的氧化分解是导致δ13CDIC贫化的重要过程,微生物作用下溶解性有机质的降解是地下水中无机碳的重要来源。此外,江汉平原少数高砷地下水呈现较大的δ13CDIC值,推断江汉平原高砷含水层强还原环境下可能存在的产甲烷过程导致了明显的碳同位素分馏。

     

  • 图 1  研究区及采样点分布

    Figure 1.  Location of the study area and sampling sites for surface water and groundwater

    图 2  江汉平原地下水中As与DOC、HCO3-、Fe、NH4+质量浓度的关系图

    Figure 2.  Relationships between concentration of As and DOC, HCO3-, Fe2+, NH4+ concentrations in groundwater of the Jianghan Plain

    图 3  江汉平原地表水和地下水中溶解性无机碳和有机碳中δ13C值的范围

    Figure 3.  Range of δ13C value of DIC and DOC in surface water and groundwater in the Jianghan Plain

    图 4  承压水中δ13CDIC与ORP、As、HCO3-关系图

    Figure 4.  Relationships between δ13CDIC and ORP, As, HCO3- concentration in confined water

    图 5  δ13CDIC-δ13CDOC分别与δ13CDIC(a)、ρ(As)(b)、ρ(DOC)(c)以及δ13CDICρ(As)(d)关系图

    Figure 5.  Relationships between δ13CDIC-δ13CDOC and δ13CDIC(a), As(b), DOC(c) concentrations, and relationship between δ13CDIC and As concentrations (d)

    表  1  江汉平原地下水主要水化学指标统计

    Table  1.   Statistics of groundwater chemistry in the Jianghan Plain

    指标 pH Ca+ Mg2+ K+ Na+ Cl- SO42- NO3- HCO3- DOC Fe2+ NH4+ As
    ρB/(mg·L-1) ρB/(mg·L-1) ρB/(μg·L-1)
    浅层潜水 6.52~7.00
    (6.84)
    104~190
    (136)
    20.30~29.00
    (23.90)
    1.42~2.18
    (1.84)
    7.50~36.6
    (18.60)
    7.68~39.8
    (21.60)
    3.36~129
    (45.40)
    0.24~121
    (40.60)
    452~595
    (534)
    1.86~5.61
    (3.13)
    0.15~12.00
    (5.88)
    0.10~6.50
    (3.43)
    0.38~97.7
    (60.10)
    浅层承压水 6.51~7.51
    (7.02)
    58.50~180
    (125)
    12.10~32.4
    (24.20)
    0.31~5.54
    (1.83)
    5.10~31.50
    (16.70)
    4.07~37.50
    (9.30)
    3.58~67.10
    (7.18)
    0.16~0.62
    (0.34)
    418~917
    (646)
    0.72~22.90
    (3.81)
    0.06~12.70
    (6.69)
    0.04~13.70
    (3.58)
    0.23~2 621
    (193.00)
    注:括号中为平均值
    下载: 导出CSV

    表  2  江汉平原、大同盆地、河套平原地下水中δ13CDIC及As、Fe质量浓度范围

    Table  2.   δ13CDIC values and As, Fe concentrations in Jianghan Plain, Datong Basin and Hetao Plain

    指标 δ13CDIC/‰ ρ(As)/(μg·L-1) ρ(Fe)/(mg·L-1) 资料来源
    江汉平原 -18.5~-3.28 0.23~2 621 0.03~20.7 本研究
    大同盆地 -22.04~-6.93 3.83~1 052 0.026~0.53 文献[29]
    河套平原 -12.8~-5.34 1.32~499 0.009~3.52 文献[25]
    下载: 导出CSV
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