Molecular fractionation of dissolved organic matter on ferrihydrite: effects of dissolved cations

Liu, Minqin; Ding, Yang; Peng, Shimeng; Lu, Yang; Dang, Zhi; Shi, Zhenqing

doi:10.1071/en18235

Cited by 30 publications

(32 citation statements)

References 52 publications

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“…To minimize the adjustable parameters in model calculations, we did not alter the Δ LK 2 value either, which usually accounted for the strong binding sites due to the nitrogen- or sulfur-containing groups. Our previous study also indicated that the adsorptive fractionation of DOM molecules on iron oxyhydroxides changed the concentrations of carboxylic groups in DOM . Therefore, during the model calculations for FA supernatant samples after adsorptive fractionation, only the site density of carboxylic groups (i.e., n A , mmol (g FA) −1 ) was adjusted in WHAM 7, and log K MA and Δ LK 2 were kept unchanged (i.e., log K MA = 1.95 and Δ LK 2 = 1.75).…”

Section: Methodsmentioning

confidence: 99%

“…The adsorptive fractionation of DOM on ferrihydrite and the effects of dissolved cations (e.g., Cu 2+ , Ca 2+ , Na + ) on DOM fractionation have been illustrated at the molecular level, but the effects of anions such as phosphate on DOM fractionation still limit our knowledge about the interactions between the mineral and the organic matter in natural environments. Phosphate is a common oxyanion and exhibits a high affinity to iron oxide surfaces (e.g., ferrihydrite) .…”

Section: Introductionmentioning

confidence: 99%

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Binding Properties of Fulvic Acid Before and After Fractionation on Ferrihydrite: Effects of Phosphate

Ding

Shi

2021

ACS Earth Space Chem.

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Adsorptive fractionation of dissolved organic matter (DOM) on minerals is an important geochemical process that affects the chemical compositions and properties of DOM. Phosphate, a widely occurring oxyanion in the natural environment, can compete with DOM for adsorption to iron (oxy)hydroxide surfaces, and thus, may change the compositions and reactivity of DOM during the adsorptive fractionation process. In this study, we investigated the effect of the adsorptive fractionation of fulvic acid (FA) at the ferrihydrite− water interfaces with or without phosphate on the optical compositions and the binding properties of FA by employing spectroscopic methods combined with two-dimensional correlation spectroscopy (2DCOS) analysis and potentiometric titration coupled with WHAM 7 model calculation. Our results showed that the presence of phosphate increased the concentrations of total organic carbon, aromatic components, chromophores, acidic groups, and fluorescent fractions in FA samples after adsorptive fractionation, indicating that phosphate would compete with these organic components for the binding sites of ferrihydrite and thus affect the partition of FA components at the ferrihydrite−water surfaces. The 2DCOS analysis revealed that phosphate competed with FA components in the order as follows: fulvic-like fractions (350 nm) > humic-like fractions (460 nm) or fulvic-like fractions (305 nm). Furthermore, the presence of phosphate during the adsorptive fractionation of FA enhanced the Cu binding ability of FA but did not change the binding sequence of Cu to FA components. Our results contribute to understanding the metal-binding characteristics of DOM under the influence of complex interactions among DOM, minerals, and inorganic constituents.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Binding Properties of Fulvic Acid Before and After Fractionation on Ferrihydrite: Effects of Phosphate

Ding

Shi

2021

ACS Earth Space Chem.

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“…The results showed that the application of coal fly-ash on peat resulted in an increase in the concentration of soluble Fe (Figure 2C) and the content of exchangeable Ca (Figure 2D). Multivalent cations such as Ca 2+ and Fe 3+ are able to bind the functional groups of organic matter (COO − ) through the adsorption process so that the organic matter cannot be decomposed by soil microorganisms, and thereby decreasing the amounts of carbon mineralization products (CO2 and CH4) [14,25,26].…”

Section: Influence Of Coal Fly-ash Application On Production Of Co2 and Ch4mentioning

confidence: 99%

Reduction in carbon dioxide and methane production of tropical peatlands due to coal fly-ash application

Saidy

Priatmadi

Septiana

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Tropical peatlands with very high organic carbon (C) contents have the potential to be a source of carbon dioxide (CO2) and methane (CH4) production. Therefore, the management of tropical peatlands is essential to prevent peat decomposition and to reduce the production of CO2 and CH4. We added different amounts of coal fly-ash (CFA) (0, 25, 50, 75, 100 and 125 Mg ha−1) to tropical peats in a laboratory study to quantify changes in CO2 and CH4 production in response to the application of CFA. The amounts of CO2 and CH4 produced by the mixtures of peats and CFA over 90 days were monitored on weekly basis. Peat pH, concentrations of hot-water soluble C, calcium and iron were also measured at the end of incubation period. Results of study revealed that the application of CFA up to 50 Mg ha−1 did not change the production of CO2 and CH4, while the application of CFA by 50–125 Mg ha−1 reduced 12–24% of CO2 and 9–15% of CH4. The decrease in the production of CO2 and CH4 due to the relatively high amount of CFA application was related to the decrease in the amount of hot soluble organic C and the increase in the concentrations of Ca and Fe. This study demonstrates the potential of CFA as waste materials from coal processing of power plants in reducing CO2 and CH4 emissions of tropical peatlands.

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“…Higher water alkalinity and HCO 3 − at inlets resulted from the anaerobic decomposition of particulate organic matter, and then [H + ] increased accordingly, which made pH values at inlets lower than in the central lake region. Higher molecular weight and aromaticity of DOM was preferentially fractionated onto iron minerals, and cations (Ca, Na and Cu) intercalated between organic matter and iron by bridging to form organic mineral complexes [31,32]. When oxygen is rapidly depleted, microorganisms use oxidized components such as NO 3 − , Mn(IV), Fe(III) and SO 4 2− as electron acceptors for the decomposition of organic matter [33].…”

Section: Surface and Underlying Watermentioning

confidence: 99%

“…It was reported that microbially mediated reduction reactions of Fe(OH) 3 , SO 4 2− and NO 3 − consumed protons when organic matter oxidized and were responsible for the increase of pH [33]. Thus, reduced Fe(II), together with certain ratios of Ca/Mg, were unbound from clay carbonate [31,32]. Co, Sc and Sr were observed to decrease obviously with depth, which was quite the opposite of the ratio of Ca/Mg (R 2 = 0.7, p ≤ 0.01), having been explained as the same mechanisms to pore water at DC-2 that reverse complexation/encapsulation or cations exchange happened [48,49].…”

Section: Pore Water At Dc-2 and Dc-9mentioning

confidence: 99%

Spatial Variations of Trace Metals and Their Complexation Behavior with DOM in the Water of Dianchi Lake, China

Xiao

Mostofa

et al. 2019

IJERPH

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The dynamics of trace metals and the complexation behavior related to organic matter in the interface between water and sediment would influence water quality and evolution in the lake system. This study characterized the distribution of trace metals and the optical properties of dissolved organic matter (DOM) on the surface, and the underlying and pore water of Dianchi Lake (DC) to understand the origin of metals and complexation mechanisms to DOM. Some species of trace metals were detected and Al, Ti, Fe, Zn, Sr and Ba were found to be the main types of metals in the aquatic environment of DC. Ti, Fe, Sr and Ba predominated in water above the depositional layer. Al, Ti, Fe and Sr were the most abundant metallic types in pore water. Mn and Zn were the main type found at the southern lake site, reflecting the contribution of pollution from an inflowing river. The correlations between DOM and metals suggested that both originated from the major source as particulate organic matter (POM), associated with weathering of Ca-, Mg-carbonate detritus and Fe- or Mn-bearing minerals. High dynamics of DOM and hydrochemical conditions would change most metal contents and speciation in different water compartments. Proportions of trace metals in dissolved organic carbon (DOC) in natural waters were correlated with both DOM molecular weight and structure, different metals were regulated by different organic properties, and the same metal also had specific binding characteristic with DOM in various water compartments. This study highlighted the interrelation of DOM and metals, as well as the pivotal role that organic matter and nutrients played during input, migrations and transformations of metals, thereby reflecting water quality evolution in the lake systems.

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Molecular fractionation of dissolved organic matter on ferrihydrite: effects of dissolved cations

Cited by 30 publications

References 52 publications

Binding Properties of Fulvic Acid Before and After Fractionation on Ferrihydrite: Effects of Phosphate

Binding Properties of Fulvic Acid Before and After Fractionation on Ferrihydrite: Effects of Phosphate

Reduction in carbon dioxide and methane production of tropical peatlands due to coal fly-ash application

Spatial Variations of Trace Metals and Their Complexation Behavior with DOM in the Water of Dianchi Lake, China

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