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    包气带土壤DOM三维荧光表征及对砷污染的指示意义

    黄爽兵 王焰新 曹菱 王程 余梅 皮坤福 贾陈忠

    黄爽兵, 王焰新, 曹菱, 王程, 余梅, 皮坤福, 贾陈忠, 2012. 包气带土壤DOM三维荧光表征及对砷污染的指示意义. 地球科学, 37(3): 605-611. doi: 10.3799/dqkx.2012.069
    引用本文: 黄爽兵, 王焰新, 曹菱, 王程, 余梅, 皮坤福, 贾陈忠, 2012. 包气带土壤DOM三维荧光表征及对砷污染的指示意义. 地球科学, 37(3): 605-611. doi: 10.3799/dqkx.2012.069
    HUANG Shuang-bin, WANG Yan-xing, CHAO Ling, WANG Cheng, YU Mei, PI Kun-fu, JIA Chen-zhong, 2012. Characterization of DOM from Soil in Unsaturated Zone and Its Implications on Arsenic Mobilization into Groundwater. Earth Science, 37(3): 605-611. doi: 10.3799/dqkx.2012.069
    Citation: HUANG Shuang-bin, WANG Yan-xing, CHAO Ling, WANG Cheng, YU Mei, PI Kun-fu, JIA Chen-zhong, 2012. Characterization of DOM from Soil in Unsaturated Zone and Its Implications on Arsenic Mobilization into Groundwater. Earth Science, 37(3): 605-611. doi: 10.3799/dqkx.2012.069

    包气带土壤DOM三维荧光表征及对砷污染的指示意义

    doi: 10.3799/dqkx.2012.069
    基金项目: 

    国家自然科学基金重点项目 40830748

    中法合作交流项目 40711120189

    详细信息
      作者简介:

      黄爽兵(1982-), 男, 博士研究生, 主要从事地下水污染与防治研究.E-mail: shuangbinghuang@gmail.com

    • 中图分类号: X143;R124

    Characterization of DOM from Soil in Unsaturated Zone and Its Implications on Arsenic Mobilization into Groundwater

    • 摘要: 为了解包气带土壤DOM组成特征, 探索其对砷向地下水中迁移的影响, 对江汉平原高砷区土壤DOM进行了三维荧光光谱分析.结果表明DOM主要为类腐殖质成分, 芳香性官能团的减少导致荧光强度随包气带深度增加而变小, 局部深度荧光信号不规则变化指示非均质土壤剖面上DOM组分或主导官能团的变化.平行因子分析表明, DOM组分可更细致地分解为4种组分, 与微生物源的还原、氧化醌类和陆生的腐殖质富里酸类等相似.砷很可能在DOM腐殖质成分络合作用下与之随水体一起向下迁移, 砷的迁移也可能与微生物源的醌类作用过程有关.三维荧光光谱分析准确、快速地刻画了包气带土壤DOM的组分类别及空间变化特征, 初步揭示了DOM影响砷迁移的可能作用方式, 为进一步的地下水砷污染机制的研究提供了重要的参考信息.

       

    • 图  1  土壤DOM荧光EEM光谱示意图(由上至下依次为S1-1、S2-1、S3-1)

      Fig.  1.  3D fluorescent EEM diagram of soil DOM

      图  2  EEM总荧光强度与土壤提取DOC浓度关系(以S1为例)

      Fig.  2.  Relationship of integrated fluorescence intensity with DOC concentration in soil DOM

      图  3  平行因子模型鉴定的4种荧光组分激发、发射光谱特征

      Fig.  3.  Characteristics of excitation-emission spectra for four components identified by PARAFAC model

      图  4  DOM组分与水溶态砷随深度的变化关系(左为S1,右为S2)

      Fig.  4.  Variation of DOM components and WEA with depth

      表  1  采集的土壤样品描述

      Table  1.   Description of soil samples collected in field site

      样品编号 经纬度 取样深度(cm) 土壤剖面岩性分层 DOC(mg/L) 砷含量(μg/kg)
      S1-1 E 113°40′38″
      N 30°09′24″
      5 灰红色亚粘土,含较多杂质 24.2 27.8
      S1-2 20 灰黄色亚粘土 21.5 6.90
      S1-3 40 黄色粘土 18.4 0.00
      S1-4 60 灰黄色粘土,少量铁锈 17.3 0.00
      S1-5 80 黄色、黄褐色粘土 16.0 0.00
      S2-1 E 113°39′10″
      N 30°09′29″
      5 灰色亚砂土 22.0 28.1
      S2-2 20 灰色、灰黄色亚砂土 19.6 38.9
      S2-3 40 灰黄色亚砂土 36.2 26.9
      S2-4 60 灰黄色亚粘土,黄色斑迹,疑为生物遗迹 18.5 30.9
      S2-5 80 灰黄色亚粘土,少量黄色斑迹 18.2 2.50
      S3-1 E 113°08′49″
      N 30°19′25″
      5 灰色亚粘土,含根须 16.0 36.7
      S3-2 20 灰色亚粘土,含白色贝壳 15.5 19.8
      S3-3 40 灰色亚粘土 17.3 36.4
      S3-4 60 灰黄色亚粘土 17.9 22.1
      S3-5 80 灰黄色亚粘土 12.8 8.60
      注:DOC即溶解性有机碳;砷含量最后换算成土壤含砷量;测试在生物地质与环境地质国家重点实验室完成.
      下载: 导出CSV

      表  2  土壤DOM的荧光峰位置及荧光强度

      Table  2.   The fluorescence peak position of soil DOM and its intensity (R.U.)

      样点编号 峰A 峰C IA/IC
      Ex/Em(nm) 峰强IA(R.U.) Ex/Em(nm) 峰强IC(R.U.)
      S1-1 270/443 1.14 330/437.5 0.81 1.41
      S1-2 260/415.5 0.42 320/421 0.35 1.20
      S1-3 240/413.5 0.32 310/420 0.30 1.07
      S1-4 230/407.5 0.37 350/410 0.28 1.34
      S1-5 260/427 0.20 340/416 0.17 1.16
      S2-1 270/448.5 0.92 330/443.5 0.95 0.98
      S2-2 270/446 0.84 310/432.5 0.82 1.01
      S2-3 260/444 0.60 320/425 0.51 1.17
      S2-4 260/446 0.72 320/426.5 0.54 1.33
      S2-5 240/443 0.26 330/419.5 0.20 1.30
      S3-1 240/444.5 0.39 370/436 0.52 0.75
      S3-2 240/441.5 0.44 370/439 0.55 0.81
      S3-3 270/444.5 0.44 330/413.5 0.50 0.88
      S3-4 230/396 0.66 390/426.5 0.26 2.58
      S3-5 230/402.5 0.50 390/408.5 0.25 1.99
      注:Ex表示激发波长;Em表示发射波长;R.U.表示以350 nm激发光下荧光强度的拉曼积分作归一化处理,单位以Raman(R.U.)表示;IA/IC表示峰A和峰C强度比.
      下载: 导出CSV

      表  3  平行因子分析鉴定的荧光组分及特征

      Table  3.   The peak position of identified DOM components and its characterization

      组分 Ex./Em.Max(nm) 以前报道的相似组分(nm) 性质和可能来源 参考文献
      C1 270(370)/458.5 SQ2: 270(375)/462 (1)还原醌类;微生物来源 Cory and McKnight (2005)
      C4: 250(360)/440 (2)陆源/原位富里酸 Stedmon and Markager (2005)
      C2 320/410 C2: 315/418;P1: 310/414 (1)陆源腐殖质 Murphy et al.(2008)
      Component 5:325/428 (2)陆地或人为腐殖质,农业活动 Stedmon and Markager (2005)
      C3 < 250(300)/383 Q3: < 250(300)/388 氧化醌类;微生物来源 Cory and McKnight (2005)
      C4 370/439.5 ‘C’peak: 320-360/420-460 陆源腐殖质 Coble(1996)
      注:Ex./Em.Max表示荧光强度最大处的激发/发射波长对,基于平行因子分析.
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2011-06-15
    • 网络出版日期:  2021-11-09
    • 刊出日期:  2012-05-01

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