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    江汉平原高砷地下水中DOM三维荧光特征及其指示意义

    鲁宗杰 邓娅敏 杜尧 沈帅 马腾

    鲁宗杰, 邓娅敏, 杜尧, 沈帅, 马腾, 2017. 江汉平原高砷地下水中DOM三维荧光特征及其指示意义. 地球科学, 42(5): 771-782. doi: 10.3799/dqkx.2017.065
    引用本文: 鲁宗杰, 邓娅敏, 杜尧, 沈帅, 马腾, 2017. 江汉平原高砷地下水中DOM三维荧光特征及其指示意义. 地球科学, 42(5): 771-782. doi: 10.3799/dqkx.2017.065
    Lu Zongjie, Deng Yamin, Du Yao, Shen Shuai, Ma Teng, 2017. EEMs Characteristics of Dissolved Organic Matter and Their Implication in High Arsenic Groundwater of Jianghan Plain. Earth Science, 42(5): 771-782. doi: 10.3799/dqkx.2017.065
    Citation: Lu Zongjie, Deng Yamin, Du Yao, Shen Shuai, Ma Teng, 2017. EEMs Characteristics of Dissolved Organic Matter and Their Implication in High Arsenic Groundwater of Jianghan Plain. Earth Science, 42(5): 771-782. doi: 10.3799/dqkx.2017.065

    江汉平原高砷地下水中DOM三维荧光特征及其指示意义

    doi: 10.3799/dqkx.2017.065
    基金项目: 

    中央高校基本科研业务费专项基金“摇篮计划” CUGL140412

    国家自然科学基金面上项目 41572226

    中国地质调查局项目 12120114069301

    中国地质调查局项目 121201001000150121

    详细信息
      作者简介:

      鲁宗杰(1991-),男,硕士研究生,主要从事地下水污染与防治、水文地球化学等方面的科研工作.ORCID:0000-0002-1562-724X. E-mail:nicklulu@126.com

      通讯作者:

      邓娅敏,ORCID:0000-0002-4815-7176.E-mail:yamin.deng@cug.edu.cn

    • 中图分类号: P592

    EEMs Characteristics of Dissolved Organic Matter and Their Implication in High Arsenic Groundwater of Jianghan Plain

    • 摘要: 水体中溶解性有机质(dissolved organic matter, DOM)是含水层中砷释放的主控因素之一.江汉平原河湖众多、沟渠广布,地表水体与浅层地下水的交互作用使得DOM的组分特征及其强度有显著差异.为查明江汉平原地下水中溶解性有机质在砷迁移转化过程中的作用,对江汉平原地表水和浅层地下水进行三维荧光光谱分析,使用平行因子分析法提取水体中有机质的分子组成、功能特点和荧光特征,并分析各组分相对含量与地下水中砷与铁的关联.江汉平原水体中DOM包括3种主要组分,组分C1、C2为类腐殖质,C2是生物降解过程中产生的小分子,C3为类蛋白物质.地下水DOM以类腐殖质组分C1、C2为主,地表水以类蛋白类物质C3和小分子腐殖质C2为主.高砷地下水中DOM以陆源为主,主要通过两种途径促进As的迁移转化:(1) DOM的腐殖质组分充当微生物群落的电子运输工具,促进微生物作用下的有机质氧化和铁氧化物的还原,并伴随As的释放及大量溶解性有机碳(dissolved organic carbon, DOC)和HCO3-的产生;(2) As以铁等金属阳离子为桥接物与腐殖质结合,通过形成As-Fe-DOM络合物,导致地下水中砷的迁移.

       

    • 图  1  研究区及采样点分布

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

      图  2  平行因子鉴别出的3个荧光组分及其荧光特征

      Fig.  2.  Spectral characteristics of the 3 components model identified by EEM-PARAFAC

      图  3  研究区地表水与浅层地下水中DOM各组分相对含量

      Fig.  3.  Distribution of DOM in groundwater and surface water of Jianghan plain

      图  4  地下水中As含量与荧光指数的关系

      Fig.  4.  Relationship between As concentrations and f450/500 value of groundwater in Jianghan plain

      图  5  江汉平原浅层地下水中DOC、HCO3-、Fe与As浓度的关系

      Fig.  5.  Relationships between As and DOC, HCO3-, Fe concentrations of groundwater in Jianghan plain

      图  6  菱铁矿饱和指数(SI)与Fe浓度、Fe/As浓度比值关系

      Fig.  6.  The saturation index (SI=lg IAP/K) for siderite (FeCO3) versus the Fe concentration and the Fe/As (mM/μM) here M is mol/L, in the groundwater of the Jianghan plain

      图  7  不同As浓度的地下水中天然有机物组分的Fmax与As之间的关系

      Fig.  7.  Relationship between As concentration and Fmax of groundwater in Jianghan plain

      表  1  江汉平原主要河流沿程水化学指标

      Table  1.   Statistics for water chemistry of surface water in Jianghan plain

      所属地表水系pHDO
      (mg/L)
      Ca2+
      (mg/L)
      K+
      (mg/L)
      Mg2+
      (mg/L)
      Na+
      (mg/L)
      Cl-
      (mg/L)

      SO42-
      (mg/L)
      DOC
      (mg/L)
      NH4-N
      (mg/L)
      TDS
      (mg/L)
      硬度CaCO3
      (mg/L)
      水质
      类别

      沙洋段7.797.9350.82.449.099.389.5236.42.400.13185147
      潜江段6.878.7550.02.439.027.507.8134.82.660.15180146


      泽口段6.792.1198.211.318.033.345.545.533.93.20439294
      毛咀段6.691.7479.76.8714.327.632.932.931.67.05345232
      三伏潭段6.651.8680.17.4013.617.734.534.527.34.28326232
      袁家市段6.562.9983.67.3515.024.434.634.66.833.75343244
      彭场镇段6.664.7372.58.0812.615.537.437.423.93.23282210
      沙湖镇段6.713.0067.27.4911.714.533.533.58.093.18258195


      潜江段6.728.6649.22.408.867.798.3334.85.500.11181144
      监利段8.068.2449.62.999.459.4213.636.92.940.36185144
      黄家口段7.595.1448.23.879.7410.218.936.53.790.48192141
      峰口镇段7.715.0846.43.538.949.0616.236.03.530.59183132

      江陵段7.546.3752.42.639.039.8310.438.62.180.86193150
      监利段7.686.3754.02.689.429.3110.138.52.380.54197155
      下载: 导出CSV

      表  2  研究区地下水水化学指标统计

      Table  2.   Statistics for water chemistry of groundwater in Jianghan plain

      水化指标单位浅层潜水浅层承压水
      最大值最小值平均值最大值最小值平均值
      pH7.506.416.877.596.266.80
      ECμS/cm2 0893339941 315399869
      EhmV170207758-207-108
      氨氮mg/L1.550.020.2417.70.023.64
      Femg/L0.830.020.3220.80.017.23
      Mnmg/L3.41<0.0010.778.20<0.0010.91
      Ca2+mg/L21758.712317059.8116
      Mg2+mg/L41.16.4023.634.112.224.4
      Na+mg/L1286.9335.636.36.5418.5
      K+mg/L47.60.6210.120.00.512.29
      Cl-mg/L1400.7429.433.70.374.68
      NO3-mg/L910.3235.19.970.040.73
      SO42-mg/L2560.6565.327.90.727.73
      HCO3-mg/L730189442904267619
      DOCmg/L15.60.703.0814.410.984.01
      Asμg/L36.20.338.672 5500.54136
      TDSmg/L1 193227521692218477
      硬度mg/L713174407556204393
      下载: 导出CSV

      表  3  水体中3个荧光组分特征及其与确定组分的对比

      Table  3.   Descriptions of the three-component PARAFAC model of Ex/Em wavelengths data and their comparison with previous identified components

      组分Ex./Em.Max(nm)荧光类型文献报道
      C1245(340)/460~480类腐殖质;分子量大;易与金属离子络合237~260(300~370)/400~500(Coble, 1996; Hudson et al., 2007)
      240/456(Holbrook et al., 2006)
      225(330)/460(Carstea et al., 2014)
      <240~275(339~420)/434~520(Ishii and Boyer, 2012)
      C2250(325)/420陆源类腐殖质;生物降解过程中产生的最小分子237~260(300~370)/400~500 (Coble, 1996; Hudson et al., 2007)
      250(325)/416 (Stedmon et al., 2003)
      325/428 (Stedmon and Markager, 2005a)
      315/418 (Murphy and Stedmon, 2008)
      C3240~250/340类蛋白物质(类色氨酸);对微环境的变化敏感225~237/340~381 (Coble, 1996; Hudson et al., 2007)
      275/340 (Coble, 1996; Hudson et al., 2007)
      280/328 (Stedmon and Markager, 2005b)
      240/338 (Murphy et al., 2008)
      注:Ex./Em.Max(nm)表示荧光强度最大处的激发/发射波长,基于平行因子分析;括号中数值为第2个波峰所对应的波长.
      下载: 导出CSV
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    • 收稿日期:  2016-11-30
    • 刊出日期:  2017-05-15

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