scholarly journals Chemical and microbiological characterization of the Recent surface sediments in Kagoshima Bay and its significance to organic matter accumulation

2006 ◽  
Vol 63 ◽  
pp. 3-15
Author(s):  
Nguyen Dung Thi Phuong ◽  
Hiroto Maeda ◽  
Yosuke Taoka ◽  
Miwako Nakashima ◽  
Masayasu Hidaka ◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Sediments ◽  
Organic Matter Accumulation ◽  
Kagoshima Bay

scholarly journals dummyChemical and microbiological characterization of the Recent surface sediments in Kagoshima Bay and its significance to organic matter accumulation

1500 ◽  
Vol 99963 ◽  
pp. 9993-99915
Author(s):  
authorNguyen Dung Thi dummyPhuong ◽  
authorHiroto dummyMaeda ◽  
authorYosuke dummyTaoka ◽  
authorMiwako dummyNakashima ◽  
authorMasayasu dummyHidaka ◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Sediments ◽  
Organic Matter Accumulation ◽  
Kagoshima Bay

Characterization of organic matter in surface sediments of the Mackenzie River Basin, Canada

2009 ◽  
Vol 77 (3-4) ◽  
pp. 416-423 ◽  
Author(s):  
Jesse Carrie ◽  
Hamed Sanei ◽  
Fariborz Goodarzi ◽  
Gary Stern ◽  
Feiyue Wang
Keyword(s):  
Organic Matter ◽  
River Basin ◽  
Surface Sediments ◽  
Mackenzie River Basin ◽  
Mackenzie River

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

scholarly journals Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3511
Author(s):  
Elena Gershelis ◽  
Andrey Grinko ◽  
Irina Oberemok ◽  
Elizaveta Klevantseva ◽  
Natalina Poltavskaya ◽  
...  
Keyword(s):  
Organic Matter ◽  
Surface Sediments ◽  
Continental Margins ◽  
Laptev Sea ◽  
Lena River ◽  
Nearshore Sediments ◽  
Rock Eval ◽  
Molecular Indicators ◽  
Sedimentation Regime ◽  
The Laptev Sea

Global warming in high latitudes causes destabilization of vulnerable permafrost deposits followed by massive thaw-release of organic carbon. Permafrost-derived carbon may be buried in the nearshore sediments, transported towards the deeper basins or degraded into the greenhouse gases, potentially initiating a positive feedback to climate change. In the present study, we aim to identify the sources, distribution and degradation state of organic matter (OM) stored in the surface sediments of the Laptev Sea (LS), which receives a large input of terrestrial carbon from both Lena River discharge and intense coastal erosion. We applied a suite of geochemical indicators including the Rock Eval parameters, traditionally used for the matured OM characterization, and terrestrial lipid biomarkers. In addition, we analyzed a comprehensive grain size data in order to assess hydrodynamic sedimentation regime across the LS shelf. Rock-Eval (RE) data characterize LS sedimentary OM with generally low hydrogen index (100–200 mg HC/g TOC) and oxygen index (200 and 300 CO2/g TOC) both increasing off to the continental slope. According to Tpeak values, there is a clear regional distinction between two groups (369–401 °C for the inner and mid shelf; 451–464 °C for the outer shelf). We suggest that permafrost-derived OM is traced across the shallow and mid depths with high Tpeak and slightly elevated HI values if compared to other Arctic continental margins. Molecular-based degradation indicators show a trend to more degraded terrestrial OC with increasing distance from the coast corroborating with RE results. However, we observed much less variation of the degradation markers down to the deeper sampling horizons, which supports the notion that the most active OM degradation in LS land-shelf system takes part during the cross-shelf transport, not while getting buried deeper.

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