Factors regulating the flux of phosphate at the sediment — water interface of a subtropical calcareous lake: A simulation study with intact sediment cores

1997 ◽  
Vol 99 (1-4) ◽  
pp. 401-409 ◽  
Author(s):  
W. Eckert ◽  
A. Nishri ◽  
R. Parparova
Keyword(s):  
Simulation Study ◽  
Sediment Cores ◽  
Water Interface

Pigment Preservation in Lake Sediments: A Comparison of Sedimentary Environments in Trout Lake, Wisconsin

1991 ◽  
Vol 48 (3) ◽  
pp. 472-486 ◽  
Author(s):  
James P. Hurley ◽  
David E. Armstrong
Keyword(s):  
Accumulation Rate ◽  
Sediment Cores ◽  
Sediment Accumulation ◽  
Sediment Surface ◽  
Water Interface ◽  
Sedimentary Pigments ◽  
Sedimentary Environments ◽  
Trout Lake ◽  
Secondary Carotenoids ◽  
Β Carotene

Fluxes and concentrations of a phorbins and major algal carotenoids were quantified in sediment trap material and sediment cores from two basins of Trout Lake, Wisconsin (TrDH and TrAB). The basins were chosen to contrast the influence of oxygen content at the sediment–water interface (TrDH, oxic and TrAB, reducing), sediment accumulation rate, and focusing. Pigment diagenesis occurred in both basins, but transformations and destruction were more extensive in TrDH. Although untransformed chlorophyll a was the major phorbin deposited at the sediment surface of both basins (51–64 mol%), pigment destruction, coupled with transition to pheophytin, accounted for substantial losses, especially in oxic TrDH sediments. Fucoxanthin, peridinin, and diadinoxanthin, despite representing > 70% of the deposited carotenoid flux, were substantially degraded or transformed in both basins. However, preservation was relatively high for secondary carotenoids, such as diatoxanthin and β-carotene, and for a major cryptomonad pigment, alloxanthin. Residual profiles in sediments show that pigment sedimentation from the epilimnion and accumulation in the permanent sediments are not directly related and that diagenesis must be considered in interpreting sedimentary pigments.

Characterization of the Reduced and Oxidized Polypyrrole/Water Interface:  A Molecular Dynamics Simulation Study

2003 ◽  
Vol 107 (35) ◽  
pp. 9339-9343 ◽  
Author(s):  
J. J. López Cascales ◽  
A. J. Fernández ◽  
T. F. Otero
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Simulation Study ◽  
Dynamics Simulation ◽  
Water Interface

SUPRAMOLECULAR SYSTEMS BEHAVIOR AT THE AIR-WATER INTERFACE. MOLECULAR DYNAMIC SIMULATION STUDY.

2008 ◽  
Author(s):  
C. Sandoval ◽  
M. Saavedra ◽  
L. Gargallo ◽  
D. Radić ◽  
Alberto D’Amore ◽  
...  
Keyword(s):  
Molecular Dynamic Simulation ◽  
Molecular Dynamic ◽  
Dynamic Simulation ◽  
Simulation Study ◽  
Water Interface ◽  
Supramolecular Systems ◽  
Air Water Interface ◽  
Molecular Dynamic Simulation Study

scholarly journals Behaviour of Metal(loid)s at the Sediment-Water Interface in an Aquaculture Lagoon Environment (Grado Lagoon, Northern Adriatic Sea, Italy)

2021 ◽  
Vol 11 (5) ◽  
pp. 2350
Author(s):  
Elisa Petranich ◽  
Matteo Crosera ◽  
Elena Pavoni ◽  
Jadran Faganeli ◽  
Stefano Covelli
Keyword(s):  
Sediment Cores ◽  
Fish Farm ◽  
Trophic Chain ◽  
Water Interface ◽  
Northern Adriatic Sea ◽  
Overlying Water ◽  
Northern Adriatic ◽  
In Situ Experiments ◽  
Diffusive Fluxes ◽  
Lagoon Environment

The cycling of metal(loid)s at the sediment–water interface (SWI) was evaluated at two selected sites (VN1 and VN3) in an active fish farm in the Grado Lagoon (Northern Adriatic, Italy). In situ experiments using a transparent benthic chamber and the collection of short sediment cores were performed, to investigate the behavior of metal(loid)s in the solid (sediments) and dissolved (porewaters) phases. Total and labile concentration of metal(loid)s were also determined in sediments, to quantify their potential mobility. Comparable total concentrations were found at both sites, excluding As, Mn, Pb and V, which were higher at VN3. Metal(loid) porewater profiles showed a diagenetic sequence and a close dependence with redox (suboxic/anoxic) conditions in the surface sediments. Positive diffusive fluxes along with benthic fluxes, particularly at the more oxic site, VN1, were found for almost all metal(loid)s, indicating their tendency to migrate towards the overlying water column. Despite sediments at two sites exhibiting high total metal(loid) concentrations and moderate effluxes at the SWI, the results suggest that they are hardly remobilized from the sediments. Recycling of metal(loid)s from the SWI would not constitute a threat for the aquatic trophic chain in the fish farm.

Effects of Fe addition on sediment P dynamics in a eutrophic lake

2021 ◽  
Author(s):  
Melanie Münch ◽  
Rianne van Kaam ◽  
Karel As ◽  
Stefan Peiffer ◽  
Gerard ter Heerdt ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Surface Water ◽  
Water Column ◽  
Sediment Cores ◽  
Surface Water Quality ◽  
Water Interface ◽  
Eutrophic Lakes ◽  
Fe Addition

<p>The decline of surface water quality due to excess phosphorus (P) input is a global problem of increasing urgency. Finding sustainable measures to restore the surface water quality of eutrophic lakes with respect to P, other than by decreasing P inputs, remains a challenge. The addition of iron (Fe) salts has been shown to be effective in removing dissolved phosphate from the water column of eutrophic lakes. However, the resulting changes in biogeochemical processes in sediments as well as the long-term effects of Fe additions on P dynamics in both sediments and the water column are not well understood.</p><p>In this study, we assess the impact of past Fe additions on the sediment P biogeochemistry of Lake Terra Nova, a well-mixed shallow peat lake in the Netherlands. The Fe-treatment in 2010 efficiently reduced P release from the sediments to the surface waters for 6 years. Since then, the internal sediment P source in the lake has been increasing again with a growing trend over the years.</p><p>In 2020, we sampled sediments at three locations in Terra Nova, of which one received two times more Fe during treatment than the other two. Sediment cores from all sites were sectioned under oxygen-free conditions. Both the porewaters and sediments were analysed for their chemical composition, with sequential extractions providing insight into the sediment forms of P and Fe. Additional sediment cores were incubated under oxic and anoxic conditions and the respective fluxes of P and Fe across the sediment water interface were measured.</p><p>The results suggest that Fe and P dynamics in the lake sediments are strongly coupled. We also find that the P dynamics are sensitive to the amount of Fe supplied, even though enhanced burial of P in the sediment was not detected. The results of the sequential extraction procedure for P, which distinguishes P associated with humic acids and Fe oxides, as well as reduced flux of Fe(II) across the sediment water interface in the anoxic incubations, suggest a major role of organic matter in the interaction of Fe and P in these sediments.</p><p>Further research will include investigations of the role of organic matter and sulphur in determining the success of Fe-treatment in sequestering P in lake sediments. Based on these data in combination with reactive transport modelling we aim to constrain conditions for successful lake restoration through Fe addition.</p>

Dynamics of the Photogenerated Hole at the Rutile TiO2(110)/Water Interface: A Nonadiabatic Simulation Study

2014 ◽  
Vol 118 (47) ◽  
pp. 27393-27401 ◽  
Author(s):  
Georgios A. Tritsaris ◽  
Dmitry Vinichenko ◽  
Grigory Kolesov ◽  
Cynthia M. Friend ◽  
Efthimios Kaxiras
Keyword(s):  
Simulation Study ◽  
Water Interface ◽  
Rutile Tio2 ◽  
Photogenerated Hole

Effect of surfactant headgroups on the oil/water interface: An interfacial tension measurement and simulation study

2013 ◽  
Vol 1052 ◽  
pp. 50-56 ◽  
Author(s):  
Jiafang Xu ◽  
Yang Zhang ◽  
Haixiang Chen ◽  
Pan Wang ◽  
Zhenhua Xie ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Simulation Study ◽  
Water Interface ◽  
Oil Water

Simulation Study of the Silicon Oxide and Water Interface

2010 ◽  
Vol 7 (12) ◽  
pp. 2586-2601 ◽  
Author(s):  
Christian D. Lorenz ◽  
Mesfin Tsige ◽  
Susan B. Rempe ◽  
Michael Chandross ◽  
Mark J. Stevens ◽  
...  
Keyword(s):  
Simulation Study ◽  
Silicon Oxide ◽  
Water Interface

INCLUSION COMPLEXES BEHAVIOR AT THE AIR-WATER INTERFACE. MOLECULAR DYNAMIC SIMULATION STUDY.

2008 ◽  
Author(s):  
L. Gargallo ◽  
D. Vargas ◽  
C. Sandoval ◽  
M. Saavedra ◽  
N. Becerra ◽  
...  
Keyword(s):  
Molecular Dynamic Simulation ◽  
Molecular Dynamic ◽  
Dynamic Simulation ◽  
Inclusion Complexes ◽  
Simulation Study ◽  
Water Interface ◽  
Air Water Interface ◽  
Molecular Dynamic Simulation Study
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