东北哈尼泥炭沼泽中酚酸的组成、酚铁相互作用及其环境意义
发布时间：2019-06-22 14:53
【摘要】：大量研究表明,溶解性有机质与铁的螯合对生物可利用性铁的输出有重要影响.然而,对于天然有机质,尤其是泥炭沼泽源的酚类物质,与铁相互作用的地球化学机制仍然缺乏研究.以长白山西麓哈尼泥炭沼泽为研究对象,调查了泥炭沼泽源水体可溶性总铁、亚铁、水溶性总酚等理化指标.同时,测定了泥炭中酚酸的组成及含量,分析对比泥炭与土壤中铁的主要赋存形态.并开展了酚铁相互作用模拟实验,研究了泥炭沼泽源水体中酚铁相互作用机制.结果表明:哈尼泥炭沼泽水体中亚铁浓度与水溶性总酚浓度显著相关,说明水溶性总酚对亚铁的存在及运移有重要影响.哈尼泥炭中含有原儿茶酸、咖啡酸、没食子酸、龙胆酸、丁香酸、阿魏酸、对羟基苯甲酸、对香豆酸、水杨酸、香草酸等多种酚酸.其中,具有儿茶酚或没食子酰基结构的原儿茶酸、咖啡酸和没食子酸能与亚铁形成稳定螯合物,是泥炭沼泽源水体中Fe(Ⅱ)保持稳定并可以远距离迁移的关键.研究还表明,原儿茶酸、咖啡酸、没食子酸和龙胆酸对Fe(Ⅲ)有显着的还原作用,有利于沼泽区水体中的保持较高Fe(Ⅲ)和Fe(Ⅱ)浓度.哈尼泥炭中铁主要以活动态(可交换态、络合态和无定形态)为主,为铁的迁移、转化和循环奠定了基础.鉴于泥炭沼泽在全球的分布面积巨大以及亚铁对海洋生物有促进作用,酚酸对铁的作用机制对陆地系统向海洋输送生物可利用铁具有重要意义,并对碳循环、硫循环以及气候变化有重要影响.
[Abstract]:A large number of studies have shown that the chelation of dissolved organic matter with iron has an important effect on the output of bioavailable iron. However, there is still a lack of study on the geochemical mechanism of the interaction between natural organic matter, especially phenols from peat swamps, and iron. Taking Hani peat swampy in the western foot of Changbai Mountain as the research object, the physical and chemical indexes of soluble total iron, ferrous and water soluble total phenols in the source water of peat swampy were investigated. At the same time, the composition and content of phenolic acid in peat were determined, and the main forms of iron in peat and soil were analyzed and compared. The simulation experiment of phenol-iron interaction was carried out, and the mechanism of phenoliron interaction in peat swampy source water was studied. The results showed that the concentration of ferrous in Hani peat swampy water was significantly correlated with the concentration of water-soluble total phenols, which indicated that water-soluble total phenols had an important effect on the existence and migration of ferrous. Hani peat contains protocatechuic acid, caffeine, Gallic acid, gentian acid, eugenic acid, ferulic acid, p-hydroxybenzoic acid, p-coumaric acid, salicylic acid, vanillic acid and other phenolic acids. Among them, protocatechuic acid, caffeine and Gallic acid with catechol or Gallic acid structure can form stable chelates with ferrous, which is the key to the stability and long-distance migration of Fe (II) in peat swampy water. The results also showed that protocatechuic acid, caffeine, Gallic acid and gentian acid had significant reduction effect on Fe (III), which was beneficial to maintain high concentrations of Fe (III) and Fe (鈪，
本文编号：2504684
[Abstract]:A large number of studies have shown that the chelation of dissolved organic matter with iron has an important effect on the output of bioavailable iron. However, there is still a lack of study on the geochemical mechanism of the interaction between natural organic matter, especially phenols from peat swamps, and iron. Taking Hani peat swampy in the western foot of Changbai Mountain as the research object, the physical and chemical indexes of soluble total iron, ferrous and water soluble total phenols in the source water of peat swampy were investigated. At the same time, the composition and content of phenolic acid in peat were determined, and the main forms of iron in peat and soil were analyzed and compared. The simulation experiment of phenol-iron interaction was carried out, and the mechanism of phenoliron interaction in peat swampy source water was studied. The results showed that the concentration of ferrous in Hani peat swampy water was significantly correlated with the concentration of water-soluble total phenols, which indicated that water-soluble total phenols had an important effect on the existence and migration of ferrous. Hani peat contains protocatechuic acid, caffeine, Gallic acid, gentian acid, eugenic acid, ferulic acid, p-hydroxybenzoic acid, p-coumaric acid, salicylic acid, vanillic acid and other phenolic acids. Among them, protocatechuic acid, caffeine and Gallic acid with catechol or Gallic acid structure can form stable chelates with ferrous, which is the key to the stability and long-distance migration of Fe (II) in peat swampy water. The results also showed that protocatechuic acid, caffeine, Gallic acid and gentian acid had significant reduction effect on Fe (III), which was beneficial to maintain high concentrations of Fe (III) and Fe (鈪，
本文编号：2504684
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