Interactions between cations and water molecule bridges in soil organic matter

2013 ◽  
Vol 13 (9) ◽  
pp. 1579-1588 ◽  
Author(s):  
Gabriele E. Schaumann ◽  
Daniela Gildemeister ◽  
Yamuna Kunhi Mouvenchery ◽  
Sandra Spielvogel ◽  
Dörte Diehl
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Water Molecule

Influence of water molecule bridges on sequestration of phenol in soil organic matter of sapric histosol

2019 ◽  
Vol 16 (7) ◽  
pp. 541 ◽  
Author(s):  
Pavel Ondruch ◽  
Jiri Kucerik ◽  
Daniel Tunega ◽  
Nadeesha J. Silva ◽  
Adelia J. A. Aquino ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Water Molecule ◽  
Organic Molecules ◽  
Desorption Kinetics ◽  
Modulated Differential Scanning Calorimetry ◽  
Time Constants ◽  
Oh Groups ◽  
Solvation Energies ◽  
Kinetics Of

Environmental contextImmobilisation of organic chemicals in soil organic matter can strongly influence their availability in the environment. We show that the presence of water clusters, called water molecule bridges, hampers the release of organic molecules from soil organic matter. Moreover, water molecule bridges are sensitive to changes in environmental conditions (e.g., temperature or moisture) which affect the release of organic molecules into the environment. AbstractWater molecule bridges (WaMB) can stabilise the supramolecular structure of soil organic matter (SOM) by connecting individual SOM molecular units. WaMB are hypothesised to act as a desorption barrier and thus to physically immobilise molecules in SOM. To test this hypothesis, we prepared two sets of soil samples – aged samples with WaMB developed, and vacuumed samples, in which WaMB were disrupted. The samples were spiked with phenol and then stored under controlled humidity. The degree of phenol immobilisation in SOM was assessed by desorption kinetics of phenol into a gas phase. This was compared with the thermal stability (T*) of WaMB obtained by modulated differential scanning calorimetry (MDSC) and the results were related to computer modelling, which provided the stability and solvation energies of phenol-WaMB-SOM models. The desorption kinetics of phenol was best described by a first-order model with two time constants ranging between 1 and 10h. In aged samples, the time constants correlated with T*, which showed that the desorption time increased with increasing WaMB stability. Molecular modelling proposed that phenol molecules are preferentially locked in nanovoids with polar OH groups pointed to WaMB in the most stable configurations. Both findings support the hypothesis that WaMB can act as a desorption barrier for phenol.

Influence of Organic Chemicals on Water Molecule Bridges in Soil Organic Matter of a Sapric Histosol

2017 ◽  
Vol 121 (12) ◽  
pp. 2367-2376 ◽  
Author(s):  
Pavel Ondruch ◽  
Jiri Kucerik ◽  
Zacharias Steinmetz ◽  
Gabriele E. Schaumann
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Water Molecule ◽  
Organic Chemicals

Formation of Water Molecule Bridges Governs Water Sorption Mechanisms in Soil Organic Matter

Langmuir ◽  
2018 ◽  
Vol 34 (40) ◽  
pp. 12174-12182 ◽  
Author(s):  
Jiří Kučerík ◽  
Pavel Ondruch ◽  
Yamuna Kunhi Mouvenchery ◽  
Gabriele E. Schaumann
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Water Molecule ◽  
Water Sorption ◽  
Sorption Mechanisms

Soil Organic Matter

1962 ◽  
Vol 54 (5) ◽  
pp. 470-470
Author(s):  
T. M. McCalla
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter
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