Andosol clay re-aggregation observed at the microscale during physical organic matter fractionation

2019 ◽  
Vol 182 (2) ◽  
pp. 145-148 ◽  
Author(s):  
Thiago M. Inagaki ◽  
Carsten W. Mueller ◽  
Johannes Lehmann ◽  
Ingrid Kögel-Knabner
Keyword(s):  
Organic Matter ◽  
Physical Organic ◽  
Organic Matter Fractionation

Removal of Pollutants in Different Landfill Leachate Treatment Processes on the Basis of Organic Matter Fractionation

2018 ◽  
Vol 47 (2) ◽  
pp. 297-305 ◽  
Author(s):  
Mehdi Zolfaghari ◽  
Oumar Dia ◽  
Nouha Klai ◽  
Patrick Drogui ◽  
Satinder Kaur Brar ◽  
...  
Keyword(s):  
Organic Matter ◽  
Landfill Leachate ◽  
Leachate Treatment ◽  
Treatment Processes ◽  
Organic Matter Fractionation

Comparison of different soil organic matter fractionation methodologies: Evidences from ultrasensitive 14C measurements

2010 ◽  
Vol 268 (7-8) ◽  
pp. 1062-1066 ◽  
Author(s):  
Fabio Marzaioli ◽  
Carmine Lubritto ◽  
Ilaria Del Galdo ◽  
Antonio D’Onofrio ◽  
M. Francesca Cotrufo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Matter Fractionation

Investigating sorption-driven dissolved organic matter fractionation by multidimensional fluorescence spectroscopy and PARAFAC

2006 ◽  
Vol 304 (1) ◽  
pp. 271-276 ◽  
Author(s):  
Michael R. Banaitis ◽  
Heidi Waldrip-Dail ◽  
Melinda S. Diehl ◽  
Brett C. Holmes ◽  
James F. Hunt ◽  
...  
Keyword(s):  
Organic Matter ◽  
Fluorescence Spectroscopy ◽  
Dissolved Organic Matter ◽  
Organic Matter Fractionation ◽  
Multidimensional Fluorescence

Effects of water matrix and ozonation on natural organic matter fractionation and corresponding disinfection by-products formation

2014 ◽  
Vol 15 (1) ◽  
pp. 75-83 ◽  
Author(s):  
J. Agbaba ◽  
J. Molnar ◽  
A. Tubić ◽  
M. Watson ◽  
S. Maletić ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Natural Organic Matter ◽  
Oxidation Treatment ◽  
Trihalomethane Formation Potential ◽  
Water Matrix ◽  
Organic Matter Fractionation ◽  
Influence Of Water ◽  
The Individual ◽  
By Products

In this study the influence of water matrix and oxidation treatment by ozone on natural organic matter (NOM) fractionation and corresponding disinfection by-products formation was investigated. Three water types were selected, based on their different NOM contents (5.16–9.85 mg/L dissolved organic carbon (DOC)) and structures (42–79% proportion of hydrophobic NOM fraction). It was determined that increasing the ozone dose (0.2–0.8 mg O3/mg DOC) generally led to reductions in DOC (2–26%) and trihalomethane formation potential values (4–58%). Results of NOM fractionation showed that the reactivity of all the individual NOM fractions towards trihalomethane formation decreased after ozone oxidation (0.8 mg O3/mg DOC) by 47–69%, relative to the raw waters.

scholarly journals Natural organic matter fractionation along the treatment of water for human consumption

2013 ◽  
Vol 14 (4) ◽  
pp. 399-406
Keyword(s):  
Organic Matter ◽  
Seasonal Variation ◽  
Water Treatment ◽  
Dissolved Organic Matter ◽  
Natural Organic Matter ◽  
Treatment Plant ◽  
Human Consumption ◽  
Raw Water ◽  
Organic Matter Fractionation ◽  
Hydrophobic Acids

The main objective of this study was to characterize the organic matter present in raw water and along the treatment process, as well as its seasonal variation. A natural organic matter fractionation approach has been applied to Lever water treatment plant located in Douro River, in Oporto (Portugal). The process used was based on the sorption of dissolved organic matter in different types of ion exchange resins, DAX-8, DAX-4 and IRA-958, allowing its separation into four fractions: very hydrophobic acids (VHA), slightly hydrophobic acids (SHA), charged hydrophilic (CHA) and hydrophilic neutral (NEU). The dissolved organic carbon (DOC) determination was used to quantify dissolved organic matter. Samples were collected monthly, during approximately one year, from raw water captured at the surface and under the bed of the river, and after each step of the treatment: pre-filtration in sand/anthracite filters, ozonation, coagulation/flocculation, counter current dissolved air flotation and filtration (CoCoDAFF) and chlorination. The NEU fraction showed a seasonal variation, with maximum values in autumn for the sampling points corresponding to raw water captured at the surface and under the bed of the river. It was usually the predominating fraction and did not show a significant decrease throughout the treatment. Nevertheless their low concentration, the same occurred for the CHA and VHA fractions. There was an overall decrease in the SHA fraction throughout the water treatment (especially after CoCoDAFF and ozonation) as well as in the DOC. The TSUVA254 values obtained for raw water generally varied between 2.0 and 4.0 L mgC-1 m-1 and between 0.75 and 1.78 L mgC-1 m-1 for treated water. It was observed a decrease of TSUVA values along the treatment, especially after ozonation. These results may contribute to a further optimization in the process of treating water for human consumption.

STXM analysis of fungal soil aggregation

2020 ◽  
Author(s):  
Edith C. Hammer ◽  
Per Persson ◽  
Milda Pucetaite
Keyword(s):  
Organic Matter ◽  
Mycorrhizal Fungi ◽  
Soil Aggregates ◽  
Soil Aggregation ◽  
Dimensional Structure ◽  
Soil Matrix ◽  
Physical Organic ◽  
Organic Matter Stabilization ◽  
Mineral Interfaces

<p>Understanding soil’s C sink potential is crucial to support soil management that increases its long-term carbon storage. Soil aggregate formation is known to be a main factor for long-term C sequestration, as C becomes physically protected, or “hidden”, within an increasingly complex three-dimensional structure.</p><p>The dynamic process of soil aggregation is however not yet clearly understood. Soil (micro) organisms are thought to play a decisive role in “gluing together” and redistributing particles. They also move existing organic material, and include own exudates and dead cells into aggregates. Fungi, and especially mycorrhizal fungi play a key role in physical organic matter stabilization as they transport carbon compounds over long distances and into narrow soil pores, but little is known about the chemical remnants they leave to soil aggregates.</p><p><br>We investigated the exudates of single hyphae of two saprotrophic and two mycorrhizal fungi (G. confluens, P. subvisciva, P. involutus, R. irregularis), with and without contact to three types of minerals (quarts, goethite, muscovite). We grew them in sterile cultures on Si<sub>3</sub>N<sub>4</sub> windows and analysed hyphae, their exudate layers and the organo-mineral interfaces. STXM analysis was performed at CLS, Canada, Diamond, UK, at the C(K), K(L), N(K) and Fe(L) absorption edges, and we made complementary measurements with photothermal IR microspectroscopy at Soleil, France. We found differential composition of the exudates depending on fungal species and environmental conditions. In some cases, we could identify spatially resolved oscillating plumes of K exudates emitted from the hyphae, indicating possible exudation channels. Goethite particles in close vicinity to a hypha showed reduced Fe(2+) compounds, suggesting that oxidative processes may take place. We further investigated thin-polished samples of AMF hyphae grown in a sterile soil, and located polysaccharide-, lipid- and protein-compounds in the surrounding soil matrix.</p><p> </p><p>Our results will help to better understand the processes of fungal soil aggregation and physical organic matter stabilization.</p>

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