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 ◽  
...  

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.

2008 ◽  
Vol 40 (9) ◽  
pp. 2076-2078 ◽  
Author(s):  
S. Marinari ◽  
G. Masciandaro ◽  
B. Ceccanti ◽  
S. Grego

2017 ◽  
Vol 121 (12) ◽  
pp. 2367-2376 ◽  
Author(s):  
Pavel Ondruch ◽  
Jiri Kucerik ◽  
Zacharias Steinmetz ◽  
Gabriele E. Schaumann

1991 ◽  
Vol 23 (1-3) ◽  
pp. 447-454 ◽  
Author(s):  
H. M. Liljestrand ◽  
Y. D. Lee

The results of controlled batch experimental studies of the adsorption and desorption kinetics of dichlorobenzene to 1) size fractionated, washed sediments, 2) aggregate, washed sediment, 3) dissolved/colloidal sediment materials, and 4) bulk sediments,are used to determine the effect of inhomogeneous mixtures on the overall sorption rates. The size-segregated sediments are modeled as spherical particles with a porous outer shell of organic matter for sorption and an inert, inorganic core. The characteristic times of intraparticle diffusive transport are found to vary with particle size by about two orders of magnitude. The distribution of natural organic matter content with particle size results in sorption rates which differ greatly from that predicted by the monodisperse, homogeneous particle model. Coupled, reversible reactions between the solute and each solid size fraction are presented as a conceptual model for the interpretation of the empirical results of batch experiments.


Langmuir ◽  
2018 ◽  
Vol 34 (40) ◽  
pp. 12174-12182 ◽  
Author(s):  
Jiří Kučerík ◽  
Pavel Ondruch ◽  
Yamuna Kunhi Mouvenchery ◽  
Gabriele E. Schaumann

Chemosphere ◽  
1999 ◽  
Vol 38 (12) ◽  
pp. 2807-2824 ◽  
Author(s):  
D. Schmitt ◽  
M. Kumke ◽  
F. Seibel ◽  
F.H. Frimmel

2014 ◽  
Vol 278 ◽  
pp. 336-342 ◽  
Author(s):  
Helen Clegg ◽  
Matthew J. Riding ◽  
Robin Oliver ◽  
Kevin C. Jones ◽  
Kirk T. Semple

Sign in / Sign up

Export Citation Format

Share Document