Cation-induced coagulation of aquatic plant-derived dissolved organic matter: Investigation by EEM-PARAFAC and FT-IR spectroscopy
Cation-induced coagulation of aquatic plant-derived dissolved organic matter: Investigation by EEM-PARAFAC and FT-IR spectroscopy
复制标题
水生植物来源的溶解有机物的阳离子诱导凝结：通过 EEM-PARAFAC 和 FT-IR 光谱进行研究
DOI：
10.1016/j.envpol.2017.11.076
复制
发表时间：
2018-03-01
影响因子：
8.9
通讯作者：
Wu, Fengchang
中科院分区：
文献类型：
--
作者：
Liu, Shasha;Zhu, Yuanrong;Wu, Fengchang
金属离子对植物来源的溶解有机物(DOM)的络合和混凝作用是水生系统中有机物的重要生物地球化学过程。为此，研究了Ca(II)、Al(III)和Fe(III)离子对水生植物来源DOM的混凝和分级作用。通过对加入金属离子后上清液中溶解有机碳的分析，确定了金属离子对DOM的诱导去除。加入金属离子后，利用荧光激发发射矩阵平行因子(EEM-PARAFAC)分析和傅立叶变换红外光谱(FT-IR)对溶解和凝聚的有机组分进行了表征。添加Ca(II)、Fe(III)或Al(III)可净去除水生植物来源的DOM。Fe(III)或Al(III)对DOM的去除效率高于Ca(II)。然而，这三种金属去除植物来源的DOM的能力低于之前报道的腐殖质材料。通过荧光成分和红外吸收峰的变化表征了植物来源的DOM组分与金属离子缔合的分子和结构特征。Ca(II)、Al(III)或Fe(III)离子均能去除芳香族和类羧酸类有机物。Ca(II)优先去除含酰胺类有机物，Fe(III)或Al(III)选择性去除酚类物质。这些观察表明，植物来源的DOM可能会对水质和生物产生长期的影响，因为它与水生态系统中的金属阳离子的混凝作用很差。植物来源的DOM具有与天然有机物不同的性质，在污水处理过程中不宜尝试通过添加金属盐来去除。(C)2017爱思唯尔有限公司。保留所有权利。
Complexation and coagulation of plant-derived dissolved organic matter (DOM) by metal cations are important biogeochemical processes of organic matter in aquatic systems. Thus, coagulation and fractionation of DOM derived from aquatic plants by Ca(II), Al(III), and Fe(III) ions were investigated. Metal ion-induced removal of DOM was determined by analyzing dissolved organic carbon in supernatants after addition of these metal cations individually. After additions of metal ions, both dissolved and coagulated organic fractions were characterized by use of fluorescence excitation emission matrix parallel factor (EEM-PARAFAC) analysis and Fourier transform infrared (FT-IR) spectroscopy. Addition of Ca(II), Fe(III) or Al(III) resulted in net removal of aquatic plant-derived DOM. Efficiencies of removal of DOM by Fe(III) or Al(III) were greater than that by Ca(II). However, capacities to remove plant-derived DOM by the three metals were less than which had been previously reported for humic materials. Molecular and structural features of plant-derived DOM fractions in associations with metal cations were characterized by changes in fluorescent components and infrared absorption peaks. Both aromatic and carboxylic-like organic matters could be removed by Ca(II), Al(III) or Fe(III) ions. Whereas organic matters containing amides were preferentially removed by Ca(II), and phenolic materials were selectively removed by Fe(III) or Al(III). These observations indicated that plant-derived DOM might have a long-lasting effect on water quality and organisms due to its poor coagulation with metal cations in aquatic ecosystems. Plant-derived DOM is of different character than natural organic matter and it is not advisable to attempt removal through addition of metal salts during treatment of sewage. (C) 2017 Elsevier Ltd. All rights reserved.