Progress on Redox Characteristics of an Iron Oxide-Ferrous System in the Hyporheic Zone
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摘要:
潜流带是河流与地下水交互的关键带，具有非均质性，其中低渗透区富含的铁氧化物，在污染物的非生物自然衰减过程中发挥着重要作用。本文从铁氧化物和溶解性二价铁Fe(Ⅱ)aq的共存体系出发，评述了该体系的氧化还原能力及影响因素，并以地下水中常见的污染物氯代烃为例阐述了铁氧化物-Fe(Ⅱ)aq体系在氯代烃非生物自然衰减中的作用。指出铁氧化物-Fe(Ⅱ)aq体系的还原能力可用氧化还原电位（Eh）表示，Eh的大小受pH值、温度、溶解氧（DO）、溶解性二价铁浓度、无机和有机配体等因素的影响，可用来定量描述氯代烃等污染物被还原的速率常数。目前铁氧化物-Fe(Ⅱ)aq体系Eh的快速测定、含水层中铁氧化物种类和含量、不同铁氧化物共存和复杂水化学条件下Eh与氯代烃等污染物还原速率常数之间的关系，是准确评估污染物非生物自然衰减能力和程度的重要内容。
Abstract:The hyporheic zone is a critical zone for the interaction between groundwater and surface water. The heterogeneous system composed of iron oxides and ferrous in the low-permeability zone of the hyporheic zone is vital for the abiotic natural attenuation of pollutants. This review summarized the universality, reduction ability, and influencing factors of the iron oxides and ferrous in groundwater. Chlorinated hydrocarbons are taken as typical pollutants to indicate the role of iron oxide and ferrous system in their abiotic natural attenuation process. The review indicates that the reducing ability of the iron oxide and ferrous system can be expressed by Eh which is influenced by pH, ferrous concentration, and natural organic matter. Whereas the rate constant of abiotic natural attenuation of pollutants can be quantitatively described by Eh. So far, the rapid and accurate determination of Eh and the establishment of quantitative relationships between various pollutants and Eh under complex hydrochemical conditions will be the key to evaluating the abiotic natural attenuation of pollutants in aquifers. The BRIEF REPORT is available for this paper at
http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202309090150 .-
Key words:
- hyporheic zone /
- iron oxides /
- heterogeneity /
- abiotic natural attenuation
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表 1 常见铁氧化物的类型
Table 1. Types of common iron oxides.
氧化铁 水合羟基氧化铁 化学式 铁氧化物 化学式 铁氧化物 β-Fe2O3 β-Fe2O3 Fe5HO8·4H2O 水铁矿 ε-Fe2O3 ε-Fe2O3 α-FeOOH 针铁矿 FeO 方铁矿 γ-FeOOH 纤铁矿 Fe3O4 磁铁矿 β-FeOOH 四方纤铁矿 γ-Fe3O4 磁赤铁矿 δ’-FeOOH(结晶度低) 六方纤铁矿 α-Fe2O3 赤铁矿 δ-FeOOH(结晶度高) 六方纤铁矿 Fe16O16(OH)y(SO4)x·nH2O 施氏矿物 Fe(OH)3 纳伯尔矿 FexⅢFeyⅡ(OH)3x+2y−z(A−)z (A=Cl−；1/2CO32−；1/2SO42−) 绿锈 注：修改自杨忠兰等(2021)［7］。 
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