大九湖泥炭沼泽源铁有机配合物的络合稳定性及其生态环境意义

黄玉冰; 赵甜甜; 向武; 赵云鹏; 刘洋

doi:10.3799/dqkx.2020.149

Volume 46 Issue 5

May 2021

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Article Navigation > Earth Science > 2021 > 46(5): 1862-1870

Huang Yubing, Zhao Tiantian, Xiang Wu, Zhao Yunpeng, Liu Yang, 2021. Stability of Organic Iron Complexes in Dajiuhu Peats and Its Ecological Significance. Earth Science, 46(5): 1862-1870. doi: 10.3799/dqkx.2020.149

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Huang Yubing, Zhao Tiantian, Xiang Wu, Zhao Yunpeng, Liu Yang, 2021. Stability of Organic Iron Complexes in Dajiuhu Peats and Its Ecological Significance. Earth Science, 46(5): 1862-1870. doi: 10.3799/dqkx.2020.149

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Stability of Organic Iron Complexes in Dajiuhu Peats and Its Ecological Significance

doi: 10.3799/dqkx.2020.149

Huang Yubing^{1
,
,},
Zhao Tiantian¹,
Xiang Wu^{1, 2
,
,
,},
Zhao Yunpeng¹,
Liu Yang¹

1.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences, Wuhan 430074, China

Received Date: 2020-11-07
Publish Date: 2021-05-15

Abstract

Abstract

In order to study the complexing stability of organic iron complexes from peat, the stability of DOM-Fe²⁺, Fe³⁺ in different molecular weights of Dajiuhu peatland was determined by potentiometric titration and fluorescence quenching titration. There are obvious differences between the results of potentiometric titration (4.0-6.1) and fluorescence quenching titration (1.5-4.1), which can be explained by the deprotonation of OH in high pH value and the oxidation of Fe²⁺ during the experiments. Potentiometric titration is suitable for studying the complexing stability of different molecular weights of DOM-Fe; the pH would not change during the experiment using fluorescence quenching titration method. Thus, the fluorescence method can be well applied to the element of variable valency. The results show that the complexing stability constants of DOM-Fe³⁺ is higher than that of Fe²⁺, and that of low-molecular-weight DOM with Fe²⁺ and Fe³⁺ is higher. The experiment indicates that high stability of DOM-Fe in peat, and relatively low-molecular-weight DOM has stronger ability to complex iron. Even Fe²⁺ is oxidized to Fe³⁺, it can still complex with DOM stably, which is conducive to the output of terrestrial dissolved iron to aquatic ecosystem. The complexing stability of iron organic complexes from peat will also affect the bioavailability of iron.
- stability constant,
- potentiometric titration,
- fluorescence quenching titration,
- dissolved organic matter,
- iron,
- environmental geochemistry

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References(44)

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Stability of Organic Iron Complexes in Dajiuhu Peats and Its Ecological Significance

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