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.

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

scholarly journals Temporal and Spatial Distribution and Fluorescence Spectra of Dissolved Organic Matter in Plateau Lakes: A Case Study of Qinghai Lake

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3481
Author(s):  
Zheng Li ◽  
Zhenghui Fu ◽  
Yang Zhang ◽  
Yunyan Guo ◽  
Feifei Che ◽  
...  
Keyword(s):  
Organic Matter ◽  
Spatial Distribution ◽  
Dissolved Organic Matter ◽  
Fluorescence Intensity ◽  
Rapid Development ◽  
Water Environment ◽  
Anthropogenic Sources ◽  
Qinghai Lake ◽  
Total Fluorescence ◽  
Temporal And Spatial

Dissolved organic matter (DOM) has a great impact on the main pollution indicators of lakes (such as chemical oxygen demand, COD). Therefore, DOM is the research basis for understanding the meaning of the water environment and the laws of the migration and transformation of pollutants. Qinghai Lake is one of the world’s typical inland plateau lake wetlands. It plays important roles in improving and regulating the climate and in promoting a virtuous regional ecological cycle. In recent years, with the acceleration of urbanization and the rapid development of tourism, under the background of climate change, and with grassland degradation and precipitation change, the whole basin of Qinghai Lake has been facing great ecological pressure. In order to comprehensively explore the water environment of Qinghai Lake and to protect the sustainable development of the basin, a systematic study was carried out on the whole basin of Qinghai Lake. The results show the following: (1) from 2010 to 2020, the annual average value of CODCr in Qinghai Lake fluctuated in the range from class III to class V according to the surface water environmental quality standard, showing first a downward trend and then an upward trend. (2) The concentration of CDOM in Qinghai Lake had obvious temporal and spatial changes. (3) The spatial distribution of the total fluorescence intensity of FDOM in water was also different in different seasons. However, in the three surveys, the area with the highest total fluorescence intensity of FDOM in the water body appeared near Erlangjian in the south of Qinghai Province, indicating that anthropogenic sources are the main controlling factors of dissolved organic matter in the lake.

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 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

Emerging investigator series: spatial distribution of dissolved organic matter in ice and at air–ice interfaces

2019 ◽  
Vol 21 (7) ◽  
pp. 1076-1084 ◽  
Author(s):  
Subha Chakraborty ◽  
Tara F. Kahan
Keyword(s):  
Organic Matter ◽  
Spatial Distribution ◽  
Dissolved Organic Matter ◽  
Surface Interactions ◽  
Heterogeneous Reactions ◽  
Organic Solutes ◽  
Ice Surface ◽  
Snow And Ice

Organic solutes in snow and ice can be distributed heterogeneously throughout the ice bulk and across the ice surface. This may affect air-surface interactions and heterogeneous reactions in snow-covered regions.

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