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    东北哈尼泥炭沼泽中酚酸的组成、酚铁相互作用及其环境意义

    邬钰 向武 傅先芳 李启立 苏靖 龚文 王翰

    邬钰, 向武, 傅先芳, 李启立, 苏靖, 龚文, 王翰, 2016. 东北哈尼泥炭沼泽中酚酸的组成、酚铁相互作用及其环境意义. 地球科学, 41(4): 683-691. doi: 10.3799/dqkx.2016.057
    引用本文: 邬钰, 向武, 傅先芳, 李启立, 苏靖, 龚文, 王翰, 2016. 东北哈尼泥炭沼泽中酚酸的组成、酚铁相互作用及其环境意义. 地球科学, 41(4): 683-691. doi: 10.3799/dqkx.2016.057
    Wu Yu, Xiang Wu, Fu Xianfang, Li Qili, Su Jing, Gong Wen, Wang Han, 2016. Effect of Phenolic Acids Derived from Peatland on Surface Behavior of Iron and Its Significance:A Case Study in Hani Peatland. Earth Science, 41(4): 683-691. doi: 10.3799/dqkx.2016.057
    Citation: Wu Yu, Xiang Wu, Fu Xianfang, Li Qili, Su Jing, Gong Wen, Wang Han, 2016. Effect of Phenolic Acids Derived from Peatland on Surface Behavior of Iron and Its Significance:A Case Study in Hani Peatland. Earth Science, 41(4): 683-691. doi: 10.3799/dqkx.2016.057

    东北哈尼泥炭沼泽中酚酸的组成、酚铁相互作用及其环境意义

    doi: 10.3799/dqkx.2016.057
    基金项目: 

    国家自然科学基金项目 41172330

    详细信息
      作者简介:

      邬钰(1990-),女,硕士研究生,主要从事环境地球化学研究.E-mail: wuyu_cug@126.com

      通讯作者:

      向武,E-mail: bgegxw@aliyun.com

    • 中图分类号: P59

    Effect of Phenolic Acids Derived from Peatland on Surface Behavior of Iron and Its Significance:A Case Study in Hani Peatland

    • 摘要: 大量研究表明,溶解性有机质与铁的螯合对生物可利用性铁的输出有重要影响.然而,对于天然有机质,尤其是泥炭沼泽源的酚类物质,与铁相互作用的地球化学机制仍然缺乏研究.以长白山西麓哈尼泥炭沼泽为研究对象,调查了泥炭沼泽源水体可溶性总铁、亚铁、水溶性总酚等理化指标.同时,测定了泥炭中酚酸的组成及含量,分析对比泥炭与土壤中铁的主要赋存形态.并开展了酚铁相互作用模拟实验,研究了泥炭沼泽源水体中酚铁相互作用机制.结果表明:哈尼泥炭沼泽水体中亚铁浓度与水溶性总酚浓度显著相关,说明水溶性总酚对亚铁的存在及运移有重要影响.哈尼泥炭中含有原儿茶酸、咖啡酸、没食子酸、龙胆酸、丁香酸、阿魏酸、对羟基苯甲酸、对香豆酸、水杨酸、香草酸等多种酚酸.其中,具有儿茶酚或没食子酰基结构的原儿茶酸、咖啡酸和没食子酸能与亚铁形成稳定螯合物,是泥炭沼泽源水体中Fe(Ⅱ)保持稳定并可以远距离迁移的关键.研究还表明,原儿茶酸、咖啡酸、没食子酸和龙胆酸对Fe(Ⅲ)有显着的还原作用,有利于沼泽区水体中的保持较高Fe(Ⅲ)和Fe(Ⅱ)浓度.哈尼泥炭中铁主要以活动态(可交换态、络合态和无定形态)为主,为铁的迁移、转化和循环奠定了基础.鉴于泥炭沼泽在全球的分布面积巨大以及亚铁对海洋生物有促进作用,酚酸对铁的作用机制对陆地系统向海洋输送生物可利用铁具有重要意义,并对碳循环、硫循环以及气候变化有重要影响.

       

    • 图  1  哈尼泥炭沼泽区位置

      Fig.  1.  Location of Hani peatland

      图  2  土壤(1~3号)和泥炭(4~10号)样品中铁的赋存形态及含量

      Fig.  2.  Different speciations and concentration of iron in soil(No.1-3) and peat(No.4-10) samples

      图  3  不同酚酸对亚铁的保护能力

      Fig.  3.  Various phenolic acids' protective capacity for ferrous iron

      图  4  不同酚酸对Fe(Ⅲ)的还原

      Fig.  4.  Reductive actions between various phenolic acids and Fe(Ⅲ)

      表  1  铁与其他指标的相关性分析

      Table  1.   Correlation analysis of iron and various chemical indexes

      氟离子 氯离子 硝酸根 硫酸根 亚铁 总铁 总酚 UV254 DOC
      氟离子 1 0.570** -0.369 -0.401* 0.523** 0.531** 0.415* 0.566** 0.132
      氯离子 1 -0.313 -0.209 0.480* 0.401* 0.312 0.353 0.360
      硝酸根 1 0.378 -0.551** -0.604** -0.585** -0.714** -0.649**
      硫酸根 1 -0.133 -0.741** -0.717** -0.636** -0.529**
      亚铁 1 0.547** 0.489** 0.703** 0.354
      总铁 1 0.923** 0.929** 0.706**
      总酚 1 0.897** 0.773**
      UV254 1 0.709**
      DOC 1
      注:**.在0.01水平(双侧)上显著相关;*.在0.05水平(双侧)上显著相关.
      下载: 导出CSV

      表  2  铁的理论形态和浓度(pH=8)

      Table  2.   Theoretical species and concentration of iron

      理论形态 浓度(mol/L)
      Fe(OH)3- 9.76×10-24
      Fe(OH)+ 3.83×10-20
      Fe(OH)+2 1.17×10-24
      Fe(OH)2+ 4.58×10-19
      Fe2(OH)24+ 4.53×10-47
      Fe(OH)3(aq) 4.95×10-19
      Fe(OH)4- 4.64×10-20
      Fe3(OH)45+ 3.00×10-64
      Fe(OH)2(aq) 3.06×10-23
      下载: 导出CSV

      表  3  没食子酸、咖啡酸和原儿茶酸加入亚铁前后特征峰波长变化

      Table  3.   Changes in absorption spectra for gallic acid, caffeic acid and protocatechuic acid before and after addition of Fe2+

      酚酸 特征峰波长(nm) 加入亚铁后特征峰波长(nm)
      没食子酸 220,260 230,290
      咖啡酸 230,290,310 285,/,330
      原儿茶酸 250,289 300
      注:“/”代表数值在检测限以下.
      下载: 导出CSV
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