Energy Harvesting, Electrode Processes and the Partitioning and Speciation of Solid Phase Iron and Sulfur in Marine Sediments

2003 ◽  
Author(s):  
Clare E. Reimers
Keyword(s):  
Energy Harvesting ◽  
Marine Sediments ◽  
Solid Phase ◽  
Electrode Processes

The Solid Phase of Marine Sediments

2006 ◽  
pp. 1-25 ◽  
Author(s):  
Dieter K. Fütterer
Keyword(s):  
Marine Sediments ◽  
Solid Phase

scholarly journals Petrographical and Geochemical Signatures Linked to Fe/Mn Reduction in Subsurface Marine Sediments from the Hydrate-Bearing Area, Dongsha, the South China Sea

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 624 ◽  
Author(s):  
Xi Xiao ◽  
Qian-Zhi Zhou ◽  
Shao-Ying Fu ◽  
Qian-Yong Liang ◽  
Xiang-Po Xu ◽  
...  
Keyword(s):  
Organic Matter ◽  
South China Sea ◽  
Marine Sediments ◽  
South China ◽  
Inorganic Carbon ◽  
Solid Phase ◽  
The South China Sea ◽  
Anaerobic Oxidation Of Methane ◽  
The South ◽  
China Sea

Fe and Mn oxides and (oxy)-hydroxides are the most abundant solid-phase electron acceptors in marine sediments, and dissimilatory Fe/Mn reduction usually links with the anaerobic oxidation of methane (AOM) and organic matter oxidation (OMO) in sediments. In this study, we report the results from subsurface marine sediments in the Dongsha hydrate-bearing area in the South China Sea. The petrological and geochemical signatures show that the Fe/Mn reduction mediated by AOM and OMO might occur in sediments above the sulfate-methane transition zone. X-ray diffraction and scanning electron microscopy analyses of sediments indicate that Fe(III)/Mn(IV)-oxides and authigenic carbonate minerals coexisted in the Fe/Mn reduction zone. The lower δ13C values of dissolved inorganic carbon, coupled with an evident increase in total inorganic carbon contents and a decrease in Ca2+ and Mg2+ concentrations indicate the onset of AOM in this zone, and the greater variation of PO43− and NH4+ concentrations in pore water suggests the higher OMO rates in subsurface sediments. Geochemical and mineralogical analyses suggest that the previously buried Fe(III)/Mn(IV) oxides might be activated and lead to the onset of Fe/Mn reduction induced by AOM and OMO. These findings may extend our understanding of the biogeochemical processes involved in Fe/Mn reduction in continental shelves with abundant methane, organic matter, and terrigenous metal oxides.

scholarly journals Assessing bioavailability of DDT and metabolites in marine sediments using solid-phase microextraction with performance reference compounds

2013 ◽  
Vol 32 (9) ◽  
pp. 1946-1953 ◽  
Author(s):  
Lian-Jun Bao ◽  
Fang Jia ◽  
J. Crago ◽  
Eddy Y. Zeng ◽  
D. Schlenk ◽  
...  
Keyword(s):  
Marine Sediments ◽  
Solid Phase Microextraction ◽  
Solid Phase

scholarly journals On the processes of migration and diffusion in the systems with solid-state reagents

2020 ◽  
Vol 10 (2) ◽  
pp. 219-227
Author(s):  
Viacheslav Barsukov ◽  
Volodymyr Khomenko ◽  
Oksana Chernysh
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Diffusion Model ◽  
Diffusion Processes ◽  
Solid Phase ◽  
Electrode Processes ◽  
Bulk Solid ◽  
Efficient Diffusion ◽  
The Difference ◽  
And Migration

This paper deals with peculiarities of diffusion and migration in electrochemical systems with solid-state reagents (ESSSR). Contradictions of the diffusion model are analyzed. It is the difference of applied potentials and the corresponding electric field strength in the bulk solid phase and at the interfaces which is the primary driving force of charge transfer in ESSSR. The time characteristic of diffusion processes is not comparable to the duration of electrode processes at charging/discharging of batteries and especially electrochemical capacitors. In many real systems involving ESSSR, the process of diffusion in solid phase is absent. Examples of charge transfer processes in ESSSR (nickel hydroxide electrode, sparingly soluble quinoid compounds, Li+ intercalation in graphite, etc.) are considered, and the processes are explained using the Grothuss, tunnel and other migration mechanisms. It is shown in this paper that the linear relationship between peak currents in voltammetric curves and the square root of potential scan rate cannot be presented as an ultimate support of the diffusion model, but as а more universal property of ESSSR. In this aspect, the efficient diffusion coefficient, Deff, could be at best discussed, not to distort the ideas of charge-transfer migration mechanisms in the ESSSR.

Development of a matrix solid phase dispersion methodology for the determination of triazine herbicides in marine sediments

2017 ◽  
Vol 133 ◽  
pp. 137-143 ◽  
Author(s):  
Noelia Rodríguez-González ◽  
María-José González-Castro ◽  
Elisa Beceiro-González ◽  
Soledad Muniategui-Lorenzo
Keyword(s):  
Marine Sediments ◽  
Solid Phase ◽  
Triazine Herbicides ◽  
Matrix Solid Phase Dispersion ◽  
Phase Dispersion
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