Preferential molecular fractionation of dissolved organic matter by iron minerals with different oxidation states

Wang, Yu; Zhang, Zheyun; Han, Lanfang; Sun, Ke; Jin, Jie; Yang, Yu; Yang, Yan; Hao, Zhineng; Liu, Jingfu; Xing, Baoshan

doi:10.1016/j.chemgeo.2019.05.003

Cited by 46 publications

(39 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While the interactions between iron sulfide minerals (e.g., mackinawite) and heavy metals and pollutants have been extensively studied in the context of bioremediation applications ( Chen et al, 2019 ), to our best knowledge, only two studies have explored TC levels in iron sulfide minerals in laboratory incubations ( Balind, 2019 ; Wang et al, 2019 ). In experiments co-precipitating mackinawite with dissolved organic carbon extracted with water from soil, corn, and phytoplankton, levels of TOC in mackinawite of up to ~80 mg/g, ~105 mg/g, and ~ 145 mg/g were measured, respectively.…”

Section: Resultsmentioning

confidence: 99%

Quantification of Organic Carbon Sequestered by Biogenic Iron Sulfide Minerals in Long-Term Anoxic Laboratory Incubations

2022

View full text Add to dashboard Cite

Organic carbon sequestration in sedimentary environments controls oxygen and carbon dioxide concentrations in the atmosphere. While minerals play an important role in the preservation of organic carbon, there is a lack of understanding about the formation and stability of organo-mineral interactions in anoxic environments, especially those involving authigenic iron sulfide minerals. In this study, we quantified organic carbon and nitrogen sequestered in biogenic iron sulfide minerals co-precipitated with sulfate-reducing bacteria (SRB) in freshwater and marine conditions in long-term laboratory experiments. The amounts of C and N associated with biogenic iron sulfide minerals increased with increasing cell biomass concentrations available in the media. C and N levels stabilized over the first 2 months of incubation and remained stable for up to 1 year. Crystalline mackinawite (FeS) formed in all experimental conditions and transformed to greigite only in some experimental conditions. We did not find evidence that this mineral transformation affected C and N levels, neither could we identify the factors that controlled greigite formation. Pyrite did not form in our experimental conditions. While C concentrations in minerals correlated with concentrations of reduced sulfate in both the freshwater and marine media, removal of OC by iron sulfide minerals was more efficient in freshwater than marine conditions. Removal of OC by iron sulfide minerals was also more efficient when cells were present (SRB biomass) in comparison with abiotic incubations with organic mixtures (e.g., tryptone, yeast extract, and casamino acids). Our study highlights the potential for biogenic iron sulfide minerals to quantitatively contribute to organic carbon preservation in anoxic environments.

show abstract

Section: Resultsmentioning

confidence: 99%

Quantification of Organic Carbon Sequestered by Biogenic Iron Sulfide Minerals in Long-Term Anoxic Laboratory Incubations

2022

View full text Add to dashboard Cite

show abstract

“…(2) Fourier transform mass spectrometers have an extremely high mass-resolving power and mass accuracy compared to other MS techniques [60,61]. Ultrahigh-resolution mass spectrometry, such as FT-ICR-MS and Orbitrap-MS, allows for the simultaneous analysis of hundreds to thousands of different organic molecules from soil-derived water and chemical extracts based on exact m/z ratios [3,28,62,63]. Both techniques allow for the prediction and classification of molecular formulae in unknown samples, and are both sensitive to isotopic composition (e.g., these techniques can be used for stable isotope probing (SIP) experiments) [28].…”

Section: Multifaceted Analysis Of Redox Heterogeneity In Soilsmentioning

confidence: 99%

Redox Heterogeneity Entangles Soil and Climate Interactions

Wilmoth

2021

Sustainability

View full text Add to dashboard Cite

Interactions between soils and climate impact wider environmental sustainability. Soil heterogeneity intricately regulates these interactions over short spatiotemporal scales and therefore needs to be more finely examined. This paper examines how redox heterogeneity at the level of minerals, microbial cells, organic matter, and the rhizosphere entangles biogeochemical cycles in soil with climate change. Redox heterogeneity is used to develop a conceptual framework that encompasses soil microsites (anaerobic and aerobic) and cryptic biogeochemical cycling, helping to explain poorly understood processes such as methanogenesis in oxygenated soils. This framework is further shown to disentangle global carbon (C) and nitrogen (N) pathways that include CO2, CH4, and N2O. Climate-driven redox perturbations are discussed using wetlands and tropical forests as model systems. Powerful analytical methods are proposed to be combined and used more extensively to study coupled abiotic and biotic reactions that are affected by redox heterogeneity. A core view is that emerging and future research will benefit substantially from developing multifaceted analyses of redox heterogeneity over short spatiotemporal scales in soil. Taking a leap in our understanding of soil and climate interactions and their evolving influence on environmental sustainability then depends on greater collaborative efforts to comprehensively investigate redox heterogeneity spanning the domain of microscopic soil interfaces.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Preferential molecular fractionation of dissolved organic matter by iron minerals with different oxidation states

Cited by 46 publications

References 42 publications

Quantification of Organic Carbon Sequestered by Biogenic Iron Sulfide Minerals in Long-Term Anoxic Laboratory Incubations

Quantification of Organic Carbon Sequestered by Biogenic Iron Sulfide Minerals in Long-Term Anoxic Laboratory Incubations

Redox Heterogeneity Entangles Soil and Climate Interactions

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

Contact Info

Product

Resources

About