Effect of Phenolic Acids Derived from Peatland on Surface Behavior of Iron and Its Significance:A Case Study in Hani Peatland
Wu Yu
Xiang Wu
Fu Xianfang
Li Qili
Su Jing
Gong Wen
Wang Han
Abstract：The influence of dissolved organic matters as metal chelators on the bio-available iron input to the ocean has been widely reported by several studies.However,natural dissolved organic matters,especially the phenolics originated from peat-lands and geochemical interactions with iron remains poorly understood.Hani peatland,as the national nature reserve in Jilin Province,is located in the central Longgang Mountain on the west side of Changbai Mountains.Physiochemical characteristics of water samples collected from rivers in Hani,including total dissolved iron,ferrous iron,dissolved organic carbon and pH etc.,were detected in the field.Inner connections of these indexes were demonstrated through multivariate statistical analysis and simulation experiments on geochemical interactions between iron and phenolic acids were conducted in laboratory.Results show that total dissolved phenol plays an important role in the existence and transportation of ferrous iron.Ten phenolic acid, including protocatechuic acid,caffeic acid,gallic acid,gentisic acid,syringic acid,ferulic acid,p-hydroxybenzoic acid,p-cou-maric acid,salicylic acid and vanillic acid,were detected by high performance liquid chromatography.Simulation experiments reveal that phenolics bearing either catechol or galloyl moiety groups (protocatechuic acid,caffeic acid and galllic acid)could chelate ferrous iron,which is the geochemical cause of high concentration of dissolved iron and is crucial for iron transport in peatland.Reducing action of phenolics to Fe(III)is also responsible for maintaining high concentration of Fe(II)and Fe(III)in rivers drained from peatland.Considering the wide distribution of peatlands globally,the higher concentration of Fe in peat-lands,and the enhancement of marine organisms by Fe,the complexation and reductive actions between iron and phenolics o-riginated from peatlands are of important significance to global iron cycle coupled with other element cycles,such as carbon and sulfur,which can significantly influence global ecological balance.
Keywords：Hanipeatlandphenolic acidironenvironmental geologygeochemistry
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 683-691 )