Geochemical interactions between iron and phenolics originated from peatland in Hani, China: implications for effective transport of iron from terrestrial systems to marine

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Geochemical interactions between iron and phenolics originated from peatland in Hani, China: implications for effective transport of iron from terrestrial systems to marine

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作者：Yu Wu ; Wu Xiang ; Xianfang Fu ; Sen Yan ; Jing Su ; Jinling Liu…
关键词：Peatland ; Phenolic acids ; Metal–organic interactions ; Iron transportation
刊名：Environmental Earth Sciences
出版年：2016
出版时间：February 2016
年：2016
卷：75
期：4
全文大小：549 KB
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作者单位：Yu Wu (1)
Wu Xiang (1) (2)
Xianfang Fu (1)
Sen Yan (1)
Jing Su (1)
Jinling Liu (1)
Zhengyu Bao (1)

1. School of Earth Sciences, China University of Geosciences (Wuhan), Wuhan, 430074, China
2. Sate Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China
刊物类别：Earth and Environmental Science
刊物主题：None Assigned
出版者：Springer Berlin Heidelberg
ISSN：1866-6299

文摘

Iron is a restrictive element for primary productivity in the oceans. The influence of dissolved organic matters as metal chelators on the bio-available iron input to the ocean has been widely reported. However, natural dissolved organic matters, especially the phenolics originated from peatlands and geochemical interactions with iron remains poorly understood. In this study, solid phase extraction-high performance liquid chromatography experiments were conducted to determine the vertical distributions of phenolic acids in different peat layers in Hani Peatland, China. Ten phenolic acids, including protocatechuic acid, p-hydroxybenzoic acid, gentisic acid, caffeic acid, etc. were detected. Simulation experiments of phenolics-Fe interactions under alkaline conditions (pH = 8.0 ± 0.1) indicated phenolic acids bearing either catechol or galloyl groups (such as protocatechuic acid, caffeic acid and gallic acid) could chelate iron to produce relatively stable phenolics-Fe complexes and therefore help to weaken its precipitation in the oxidative condition. In addition, the simulation experiments with artificial coastal waters demonstrated that this complexation could ensure that at least 25 % of the initial Fe load dissolve in coastal water, implying large part of dissolved iron in rivers draining from peatlands could be transported through the estuarine zones. Considering the wide distribution of peatlands globally, the higher concentration of Fe in peatlands, and the enhancement of marine organisms by Fe, the geochemical interactions between iron and phenolics originated from peatlands are of important significance to transport bio-available iron from terrestrial system to oceans. Keywords Peatland Phenolic acids Metal–organic interactions Iron transportation