论文部分内容阅读
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.
Numerous studies have shown that the chelation of dissolved organic matter with iron has an important effect on the bioavailability of iron output, however, the geochemical mechanisms for the interaction with iron are still poor for natural organic matter, especially for peat swamp sources In this paper, we investigated the physical and chemical indexes of soluble total iron, ferrous and water-soluble total phenol in peat swamp source water from Hani peat swamp in the west of Changbai Mountain.At the same time, the composition and content of phenolic acids in peat were measured, The main forms of iron in soil, and carried out a simulated experiment of iron-iron interaction to study the mechanism of iron and phosphorus interaction in peat swamp source water.The results showed that the concentration of ferrous iron in Hani peat swamp water and water-soluble total phenol concentration were significantly correlated , Indicating water-soluble total phenols have an important impact on the existence and migration of ferrous metals. Hani peat contains protocatechuic acid, caffeic acid, gallic acid, gentisic acid, syringic acid, ferulic acid, p-hydroxybenzoic acid, Coumaric acid, salicylic acid, vanillic acid, etc. Among them, protocatechuic acid, caffeic acid and gallic acid having a catechol or galloyl structure can react with ferrous It is the key to stabilize Fe (Ⅱ) in peat swamp source and to migrate long distance.The study also shows that the effect of protocatechuic acid, caffeic acid, gallic acid and gentisic acid on Fe (Ⅲ) Significant reduction was beneficial to maintain high concentrations of Fe (Ⅲ) and Fe (Ⅱ) in the marsh water. The iron in Hani peat was mainly active (exchangeable, complex and amorphous) Which laid the foundation for the migration, transformation and recycling of iron.Because of the huge global distribution of peat bogs and the promotion of marine ferrous metals by ferrous iron, the mechanism of action of phenolic acids on iron is of great importance to the transportation of bio-available iron to terrestrial systems by terrestrial systems Meaning, and carbon cycle, sulfur cycle and climate change have a significant impact.