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    沉积物中铁的化学相态分析进展

    李超 舒劲松 许斐 杨守业

    李超, 舒劲松, 许斐, 杨守业, 2013. 沉积物中铁的化学相态分析进展. 地球科学, 38(3): 454-460. doi: 10.3799/dqkx.2013.045
    引用本文: 李超, 舒劲松, 许斐, 杨守业, 2013. 沉积物中铁的化学相态分析进展. 地球科学, 38(3): 454-460. doi: 10.3799/dqkx.2013.045
    LI Chao, SHU Jing-song, XU Fei, YANG Shou-ye, 2013. The Analytical Development of Low-Temperature Particulate Fe Speciation. Earth Science, 38(3): 454-460. doi: 10.3799/dqkx.2013.045
    Citation: LI Chao, SHU Jing-song, XU Fei, YANG Shou-ye, 2013. The Analytical Development of Low-Temperature Particulate Fe Speciation. Earth Science, 38(3): 454-460. doi: 10.3799/dqkx.2013.045

    沉积物中铁的化学相态分析进展

    doi: 10.3799/dqkx.2013.045
    基金项目: 

    中国博士后科学基金 2012M511129

    国家自然科学基金 41225020

    国家自然科学基金 41076018

    详细信息
      作者简介:

      李超(1983-), 男, 博士, 从事海洋地质学、边缘海沉积学及地球化学研究.E-mail: cli@tongji.edu.cn

    • 中图分类号: P595;P76

    The Analytical Development of Low-Temperature Particulate Fe Speciation

    • 摘要: 元素铁因其在地球早期环境演化和在海洋初级生产力中的重要角色, 是目前全球变化与地球化学研究的热点.铁元素的相态分析, 对于深入了解其在环境中迁移、转化及生物的吸收利用, 都具有重要意义.回顾沉积物中铁的化学相态分析方法发展过程, 从早期的简单相态分析(degree of pyritization, DOP), 元素的顺序提取法(Tesser方法), 到Raiswell和Poulton等学者提出针对Fe元素特定的相态分析法等.重点介绍较为常用的三步提取法和其在表生地球化学研究中的应用; 结合目前国际上铁地球化学循环研究进展, 提出Fe的化学相态分析的改进建议.

       

    • 图  1  胶体态、纳米颗粒态等的粒径范围(改绘自Raiswell and Canfield, 2012)

      Fig.  1.  Size ranges of particles, colloids, nanoparticles and aqueous species in relation to filterable iron

      图  2  铁的生物地球化学循环中海洋储库的输入和输出示意图(改绘自Raiswell, 2006)

      Fig.  2.  Inputs and outputs to marine reservoirs in the iron biogeochemical cycle

      表  1  颗粒态Fe的三步萃取法(Poulton and Raiswell, 2002)

      Table  1.   The three-step extraction of particulate iron

      分类 提取试剂 Fe的主要赋存形态
      FeHR 连二亚硫酸钠缓冲溶液pH=4.8反应1 h 无定形以及晶体态的含Fe氧化物(除磁铁矿)
      FePR 12 mol/L HCl煮沸2 min 磁铁矿和部分层状硅酸盐矿物中含有的Fe,例如绿泥石、绿脱石、海绿石以及黑云母等
      FeU HF-HClO4-HNO3 与硅酸盐结合的Fe
      下载: 导出CSV

      表  2  颗粒态Fe的七步提取法(Poulton and Canfield, 2005)

      Table  2.   The seven-step extraction of particulate iron

      步骤 分类 主要赋存矿物 所用试剂
      1 可交换态 吸附的含铁矿物 1 mol/L MgCl2 pH=7.0,反应2 h
      2 碳酸盐结合态的铁(Fecarb) 菱铁矿,铁白云石 1 mol/L CH3COONa pH=4.5(用CH3COOH调),50 ℃反应48 h
      3 易被提取的氧化物态(Feox1) 水铁矿,纤铁矿 1 mol/L NH2OH·HCl加入25%(v/v)HOAc
      4 能被提取的氧化物态(Feox2) 针铁矿,赤铁矿和正方针铁矿 0.35 mol/L HAc和0.2 mol/L柠檬酸钠缓冲50 g/L的连二亚硫酸钠溶液(pH=4.8)反应2 h
      5 磁铁矿(Femag) 磁铁矿 0.2 mol/L草酸铵和0.17 mol/L草酸溶液,pH=3.2,反应6 h
      6 低活性层状硅酸盐矿物(FePRS) 绿脱石、绿泥石、海绿石、黑云母等 12 mol/L HCl(5 ml)煮沸,1 min
      7 不活性的含铁硅酸盐(FeU) 残渣(450 ℃ 8 h)用6 mol/L HCl反应24 h
      下载: 导出CSV

      表  3  铁各化学相态提取主要方法比较

      Table  3.   The comparison between the main method of particulate iron extraction

      提出时间 提取方法 所用主要试剂 提取物 文献来源
      1970年 单步提取法 12 mol/L浓HCl沸煮 反应性Fe Berner, 1970
      1979年 五步提取法 MgCl2、醋酸钠、盐酸羟胺溶液、硝酸双氧水溶液以及HF-HClO4混合溶液 金属元素各化学相态 Tessier et al., 1979
      1989年 三步提取法 草酸、连二亚硫酸钠溶液、HF-H2SO4混合溶液 铁的各个化学相态 Canfield, 1989
      1994年 三步提取法 连二亚硫酸钠溶液、冷盐酸、热盐酸 铁的各个化学相态 Raiswell et al., 1994
      2005年 七步提取法 MgCl2、醋酸钠、盐酸羟胺溶液、连二亚硫酸钠溶液、草酸铵溶液、12 mol/L浓HCl以及6 mol/L的HCl 铁的各个化学相态 Poulton and Canfield, 2005
      下载: 导出CSV
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    • 收稿日期:  2012-01-19
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