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    泥炭沼泽源酚酸对铁有机复合体的溶解作用及其环境意义

    杨渭林 向武 汪亦柳 刘煜

    杨渭林, 向武, 汪亦柳, 刘煜, 2018. 泥炭沼泽源酚酸对铁有机复合体的溶解作用及其环境意义. 地球科学, 43(11): 4056-4065. doi: 10.3799/dqkx.2018.289
    引用本文: 杨渭林, 向武, 汪亦柳, 刘煜, 2018. 泥炭沼泽源酚酸对铁有机复合体的溶解作用及其环境意义. 地球科学, 43(11): 4056-4065. doi: 10.3799/dqkx.2018.289
    Yang Weilin, Xiang Wu, Wang Yiliu, Liu Yu, 2018. Dissolution of Fe-Organic Associations by Peatland-Derived Phenolic Acids and Its Environmental Significance. Earth Science, 43(11): 4056-4065. doi: 10.3799/dqkx.2018.289
    Citation: Yang Weilin, Xiang Wu, Wang Yiliu, Liu Yu, 2018. Dissolution of Fe-Organic Associations by Peatland-Derived Phenolic Acids and Its Environmental Significance. Earth Science, 43(11): 4056-4065. doi: 10.3799/dqkx.2018.289

    泥炭沼泽源酚酸对铁有机复合体的溶解作用及其环境意义

    doi: 10.3799/dqkx.2018.289
    基金项目: 

    国家自然科学基金项目 41472316

    详细信息
      作者简介:

      杨渭林(1992-), 男, 硕士研究生, 主要从事环境地球化学研究

      通讯作者:

      向武

    • 中图分类号: P618.31

    Dissolution of Fe-Organic Associations by Peatland-Derived Phenolic Acids and Its Environmental Significance

    • 摘要: 泥炭沼泽是具有全球意义的湿地类型,研究泥炭沼泽源酚酸对铁有机复合体的溶解作用有助于深入了解铁碳耦合地球化学循环过程.以中国东北金川泥炭沼泽为研究对象,提取了泥炭腐殖质,并实验合成了铁有机复合体及一系列的铁氧化物.选择原儿茶酸、咖啡酸和没食子酸等代表性泥炭沼泽源酚酸对铁有机复合体以及铁氧化物等系统开展了不同条件下的溶解试验.结果表明酚酸对无定型的水铁矿和新合成的铁有机复合溶解能力相对较弱,而对结晶态的赤铁矿、针铁矿和老化后的铁有机复合体的溶解能力较强.pH值、酚酸浓度和铁氧化物自身的结构和组成都对铁矿物的溶解作用产生影响.反映了铁有机复合体在酚酸溶液体系中比无机铁氧化物更稳定,这与泥炭沼泽中有机结合态铁比例较高、而普通矿质土壤中结晶态铁氧化物占比更大的事实相吻合.证明了铁有机复合体是泥炭沼泽中影响铁碳循环耦合的关键载体.泥炭沼泽中铁碳作用十分复杂,既能以铁有机络合物形式向海洋等水生生态系统输出大量的溶解性铁,也能通过铁有机复合体的形成促进泥炭沼泽有机碳的保存,进而影响全球铁碳循环耦合,具有重要的生态环境意义.

       

    • 图  1  合成铁矿物的电子显微镜下照片

      Fig.  1.  SEM graphics of five synthetic iron minerals

      图  2  合成铁矿物的XRD图谱

      a.水铁矿;b.针铁矿;c.赤铁矿;d.老化后的胡敏酸铁;e.新鲜的胡敏酸铁

      Fig.  2.  XRD patterns of synthetic iron minerals

      图  3  胡敏酸的傅里叶红外光谱特征

      Fig.  3.  FTIR pattern of humic acid

      图  4  不同酚酸溶解铁矿物的浓度效应

      Fig.  4.  The concentration effects of iron dissolution by phenolic acids

      图  5  不同溶解条件下的铁矿物溶解曲线

      Fig.  5.  The dissolution curves of iron minerals under different conditions

      图  6  没食子酸、原儿茶酸和咖啡酸分子结构

      Fig.  6.  The molecule diagrams of gallic acid, protocatechuic acid and caffeic acid

      表  1  铁氧化物和铁有机复合体在不同溶解体系下的溶解量

      Table  1.   The dissolved concentrations of iron oxides and iron-organic associations in different dissolution systems

      铁矿物 酚酸浓度
      (mmol/L)
      原儿茶酸 咖啡酸 没食子酸
      pH=8.0 pH=5.5 pH=8.0 pH=5.5 pH=8.0 pH=5.5
      水铁矿 0.1 0.205±0.013 0.184±0.022 0.246±0.007 0.246±0.013 0.137±0.013 0.141±0.023
      0.5 0.164±0.017 0.164±0.006 0.128±0.023 0.142±0.013 0.142±0.023 0.164±0.006
      1.0 0.142±0.013 0.142±0.006 0.178±0.017 0.205±0.046 0.205±0.028 0.331±0.028
      赤铁矿 0.1 1.222±0.132 0.271±0.080 1.299±0.273 0.229±0.013 1.112±0.147 1.493±0.418
      0.5 0.906±0.196 0.161±0.024 0.875±0.109 0.288±0.210 0.740±0.220 1.133±0.060
      1.0 0.682±0.136 0.090±0.042 0.609±0.211 0.180±0.217 0.756±0.344 0.718±0.191
      针铁矿 0.1 5.709±0.740 1.724±0.502 0.738±0.393 2.489±0.052 2.277±0.251 2.142±0.497
      0.5 4.171±1.044 0.948±0.233 0.437±0.195 1.887±0.048 1.469±0.098 1.147±0.020
      1.0 2.714±0.231 0.055±0.013 0.072±0.055 0.409±0.025 0.996±0.073 0.120±0.010
      HA-FE 0.1 0.377±0.046 0.354±0.025 0.359±0.023 0.577±0.028 0.504±0.017 0.737±0.013
      0.5 0.329±0.061 0.205±0.007 0.282±0.011 0.458±0.064 0.404±0.022 0.591±0.017
      1.0 0.133±0.011 0.124±0.007 0.232±0.034 0.472±0.050 0.345±0.028 0.582±0.073
      LHA-Fe 0.1 4.210±0.031 0.646±0.289 5.092±0.185 1.876±0.075 3.885±1.844 4.865±0.169
      0.5 1.016±0.298 0.074±0.007 3.865±0.122 0.549±0.422 1.695±0.589 1.120±0.067
      1.0 0.088±0.013 0.061±0.017 0.088±0.013 0.187±0.006 0.088±0.006 0.164±0.029
      注:溶解量单位为10-6.
      下载: 导出CSV

      表  2  不同反应体系中溶解铁含量随酚酸浓度变化程度

      Table  2.   The degrees of dissolved iron change in different reaction systems

      铁矿物 原儿茶酸 咖啡酸 没食子酸
      pH=8.0 pH=5.5 pH=8.0 pH=5.5 pH=8.0 pH=5.5
      赤铁矿 79.1% 200.1% 113.3% 27.2% 47.2% 107.8%
      针铁矿 110.3% 3 034.5% 925.0% 508.9% 128.5% 1 681.2%
      HA-Fe 183.7% 186.2% 54.6% 22.2% 45.9% 26.7%
      LHA-Fe 4 684.1% 965.3% 5 708.4% 904.8% 4 314.7% 2 860.4%
      下载: 导出CSV

      表  3  不同反应体系中铁矿物溶解速率

      Table  3.   Dissolution rates of iron minerals in different systems

      铁矿物 原儿茶酸 咖啡酸 没食子酸
      pH=8.0 pH=5.5 pH=8.0 pH=5.5 pH=8.0 pH=5.5
      针铁矿 0.729 0.207 0.412 0.149 0.288 0.318
      赤铁矿 0.202 0.080 -0.107 0.108 0.275 0.210
      HA-Fe 0.059 0.026 0.052 0.053 0.146 0.209
      LHA-Fe 0.117 0.007 0.195 0.063 0.127 0.131
      注:溶解速率单位为mg/h.
      下载: 导出CSV

      表  4  铁有机复合体和铁氧化物在不同酚酸溶液中的K

      Table  4.   The K of Fe-organic associations and iron oxides in different phenolic acid solutions

      有机复合体 HA-Fe LHA-Fe 赤铁矿 针铁矿
      原儿茶酸 58.2% 346.6% 545.9% 201.6%
      没食子酸 11.4% 177.4% 35.7% 138.4%
      咖啡酸 11.4% 254.7% -34.7% 28.0%
      下载: 导出CSV
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    • 收稿日期:  2018-08-12
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