【摘要】：大量研究表明,溶解性有機(jī)質(zhì)與鐵的螯合對(duì)生物可利用性鐵的輸出有重要影響.然而,對(duì)于天然有機(jī)質(zhì),尤其是泥炭沼澤源的酚類物質(zhì),與鐵相互作用的地球化學(xué)機(jī)制仍然缺乏研究.以長(zhǎng)白山西麓哈尼泥炭沼澤為研究對(duì)象,調(diào)查了泥炭沼澤源水體可溶性總鐵、亞鐵、水溶性總酚等理化指標(biāo).同時(shí),測(cè)定了泥炭中酚酸的組成及含量,分析對(duì)比泥炭與土壤中鐵的主要賦存形態(tài).并開展了酚鐵相互作用模擬實(shí)驗(yàn),研究了泥炭沼澤源水體中酚鐵相互作用機(jī)制.結(jié)果表明:哈尼泥炭沼澤水體中亞鐵濃度與水溶性總酚濃度顯著相關(guān),說明水溶性總酚對(duì)亞鐵的存在及運(yùn)移有重要影響.哈尼泥炭中含有原兒茶酸、咖啡酸、沒食子酸、龍膽酸、丁香酸、阿魏酸、對(duì)羥基苯甲酸、對(duì)香豆酸、水楊酸、香草酸等多種酚酸.其中,具有兒茶酚或沒食子�；Y(jié)構(gòu)的原兒茶酸、咖啡酸和沒食子酸能與亞鐵形成穩(wěn)定螯合物,是泥炭沼澤源水體中Fe(Ⅱ)保持穩(wěn)定并可以遠(yuǎn)距離遷移的關(guān)鍵.研究還表明,原兒茶酸、咖啡酸、沒食子酸和龍膽酸對(duì)Fe(Ⅲ)有顯著的還原作用,有利于沼澤區(qū)水體中的保持較高Fe(Ⅲ)和Fe(Ⅱ)濃度.哈尼泥炭中鐵主要以活動(dòng)態(tài)(可交換態(tài)、絡(luò)合態(tài)和無定形態(tài))為主,為鐵的遷移、轉(zhuǎn)化和循環(huán)奠定了基礎(chǔ).鑒于泥炭沼澤在全球的分布面積巨大以及亞鐵對(duì)海洋生物有促進(jìn)作用,酚酸對(duì)鐵的作用機(jī)制對(duì)陸地系統(tǒng)向海洋輸送生物可利用鐵具有重要意義,并對(duì)碳循環(huán)、硫循環(huán)以及氣候變化有重要影響.
[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，

本文編號(hào)：2504684