Molecular Fractionation of Dissolved Organic Matter with Metal Salts

2012 ◽  
Vol 46 (8) ◽  
pp. 4419-4426 ◽  
Author(s):  
Thomas Riedel ◽  
Harald Biester ◽  
Thorsten Dittmar
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Metal Salts ◽  
Molecular Fractionation

Dissolved Organic Matter Sorption and Molecular Fractionation by Naturally Occurring Bacteriogenic Iron (Oxyhydr)oxides

2019 ◽  
Vol 53 (8) ◽  
pp. 4295-4304 ◽  
Author(s):  
Tyler D. Sowers ◽  
Kathryn L. Holden ◽  
Elizabeth K. Coward ◽  
Donald L. Sparks
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Naturally Occurring ◽  
Molecular Fractionation

Sorption and molecular fractionation of biochar-derived dissolved organic matter on ferrihydrite

2020 ◽  
Vol 392 ◽  
pp. 122260 ◽  
Author(s):  
Peng Zhang ◽  
Aiju Liu ◽  
Peng Huang ◽  
Lujuan Min ◽  
Hongwen Sun
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Molecular Fractionation

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

2019 ◽  
Vol 16 (2) ◽  
pp. 137 ◽  
Author(s):  
Minqin Liu ◽  
Yang Ding ◽  
Shimeng Peng ◽  
Yang Lu ◽  
Zhi Dang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Carbon Cycling ◽  
Natural Environment ◽  
Divalent Cations ◽  
Ion Cyclotron Resonance ◽  
Underlying Mechanisms ◽  
Cu Ions ◽  
Molecular Fractionation ◽  
Background Electrolytes

Environmental contextCarbon sequestration and dynamics are influenced by adsorptive fractionation of dissolved organic matter (DOM) on minerals. We found that the molecular fractionation of DOM on ferrihydrite was highly dependent on the presence of Na, Ca and Cu ions in water. These results advance our mechanistic understanding of the dynamic behaviour of DOM, and contribute to predicting carbon cycling and contaminant behaviour in the natural environment. AbstractThe adsorptive fractionation of dissolved organic matter (DOM) at the ferrihydrite and water interface is a key geochemical process controlling DOM compositions and reactivity, thus affecting carbon cycling and contaminant behaviour in the environment. However, the effects of cations on DOM fractionation and the underlying mechanisms are poorly understood. In this study, Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) combined with spectroscopic methods were employed to investigate molecular fractionation of DOM on ferrihydrite under different cations in the background electrolytes, including Na, Ca, and Cu ions. The results indicated that DOM fractionation was influenced by the combined effects of cation type, intrinsic molecular property, and extent of DOM adsorption. DOM adsorption on ferrihydrite exhibited the strongest and the weakest fractionation under Na and Ca background electrolytes, respectively. Both Ca and Cu background electrolytes reduced the adsorption of highly unsaturated and phenolic/polyphenolic molecules with high molecular weight and number of O atoms. In addition to the molecular acidity, the complexation of Ca and Cu ions to DOM binding sites and the coagulation effect of divalent cations may affect molecular fractionation. Additionally, DOM fractionation was enhanced with increasing DOM adsorption. Our results contribute to predicting carbon cycling and contaminant behaviour in the natural environment.

Molecular fractionation and sub-nanoscale distribution of dissolved organic matter on allophane

2019 ◽  
Vol 6 (7) ◽  
pp. 2037-2048 ◽  
Author(s):  
Yang Ding ◽  
Yang Lu ◽  
Peng Liao ◽  
Shimeng Peng ◽  
Yuzhen Liang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Spatial Distribution ◽  
Dissolved Organic Matter ◽  
Molecular Fractionation

We elucidated the spatial distribution of DOM on allophane and the mechanisms controlling the adsorptive fractionation of DOM molecules.

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

2019 ◽  
Vol 520 ◽  
pp. 69-76 ◽  
Author(s):  
Yu Wang ◽  
Zheyun Zhang ◽  
Lanfang Han ◽  
Ke Sun ◽  
Jie Jin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Oxidation States ◽  
Iron Minerals ◽  
Molecular Fractionation
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