Characterization of organic matter in cross-margin sediment transects of an upwelling region in the Campos Basin (SW Atlantic, Brazil) using lipid biomarkers

2012 ◽  
Vol 112 (1-3) ◽  
pp. 311-327 ◽  
Author(s):  
Dulce R. P. Oliveira ◽  
Lívia G. M. S. Cordeiro ◽  
Renato S. Carreira
Keyword(s):  
Organic Matter ◽  
Lipid Biomarkers ◽  
Campos Basin ◽  
Sw Atlantic

Distribution and characterization of organic matter using lipid biomarkers: A case study in a pristine tropical bay in NE Brazil

2016 ◽  
Vol 168 ◽  
pp. 1-9 ◽  
Author(s):  
R.S. Carreira ◽  
L.G.M.S. Cordeiro ◽  
M.C. Bernardes ◽  
V. Hatje
Keyword(s):  
Organic Matter ◽  
Lipid Biomarkers ◽  
Tropical Bay

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.

Structural Characterization of Soil Organic Matter and Humic Acids in Particle-Size Fractions of an Agricultural Soil

2002 ◽  
Vol 66 (1) ◽  
pp. 129 ◽  
Author(s):  
Benny Chefetz ◽  
Jorge Tarchitzky ◽  
Ashish P. Deshmukh ◽  
Patrick G. Hatcher ◽  
Yona Chen
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Acids ◽  
Structural Characterization ◽  
Agricultural Soil ◽  
Size Fractions ◽  
Particle Size Fractions

scholarly journals Characterization of Soil Organic Matter Individual Fractions (Fulvic Acids, Humic Acids, and Humins) by Spectroscopic and Electrochemical Techniques in Agricultural Soils

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1067
Author(s):  
Aleksandra Ukalska-Jaruga ◽  
Romualda Bejger ◽  
Guillaume Debaene ◽  
Bożena Smreczak
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Substances ◽  
Humic Acids ◽  
Agricultural Soils ◽  
Fulvic Acids ◽  
Sorption Properties ◽  
Aliphatic Chains

The objective of this paper was to investigate the molecular characterization of soil organic matter fractions (humic substances (HS): fulvic acids-FAs, humic acids-HAs, and humins-HNs), which are the most reactive soil components. A wide spectrum of spectroscopic (UV–VIS and VIS–nearIR), as well as electrochemical (zeta potential, particle size diameter, and polydispersity index), methods were applied to find the relevant differences in the behavior, formation, composition, and sorption properties of HS fractions derived from various soils. Soil material (n = 30) used for the study were sampled from the surface layer (0–30 cm) of agricultural soils. FAs and HAs were isolated by sequential extraction in alkaline and acidic solutions, according to the International Humic Substances Society method, while HNs was determined in the soil residue (after FAs and HAs extraction) by mineral fraction digestion using a 0.1M HCL/0.3M HF mixture and DMSO. Our study showed that significant differences in the molecular structures of FAs, Has, and HNs occurred. Optical analysis confirmed the lower molecular weight of FAs with high amount of lignin-like compounds and the higher weighted aliphatic–aromatic structure of HAs. The HNs were characterized by a very pronounced and strong condensed structure associated with the highest molecular weight. HAs and HNs molecules exhibited an abundance of acidic, phenolic, and amine functional groups at the aromatic ring and aliphatic chains, while FAs mainly showed the presence of methyl, methylene, ethenyl, and carboxyl reactive groups. HS was characterized by high polydispersity related with their structure. FAs were characterized by ellipsoidal shape as being associated to the long aliphatic chains, while HAs and HNs revealed a smaller particle diameter and a more spherical shape caused by the higher intermolecular forcing between the particles. The observed trends directly indicate that individual HS fractions differ in behavior, formation, composition, and sorption properties, which reflects their binding potential to other molecules depending on soil properties resulting from their type. The determined properties of individual HS fractions are presented as averaged characteristics over the examined soils with different physico-chemical properties.

Geochemical characterization of the organic matter in the Devonian Pimenteiras Formation, Parnaiba Basin, Brazil – Implications for depositional environment and the potential of hydrocarbon generation

2021 ◽  
Vol 201 ◽  
pp. 108461
Author(s):  
Agostinho Mussa ◽  
Wolfgang Kalkreuth ◽  
Ana Maria Pimentel Mizusaki ◽  
Marcos Müller Bicca ◽  
Jørgen A. Bojesen-Koefoed
Keyword(s):  
Organic Matter ◽  
Depositional Environment ◽  
Hydrocarbon Generation ◽  
Geochemical Characterization ◽  
Parnaíba Basin

scholarly journals Living Benthic Foraminifera from the Surface and Subsurface Sediment Layers Applied to the Environmental Characterization of the Brazilian Continental Slope (SW Atlantic)

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1863
Author(s):  
Luciana Cristina de Carvalho Santa-Rosa ◽  
Sibelle Trevisan Disaró ◽  
Violeta Totah ◽  
Silvia Watanabe ◽  
Ana Tereza Bittencourt Guimarães
Keyword(s):  
Continental Slope ◽  
Benthic Foraminifera ◽  
Subsurface Layer ◽  
Environmental Characterization ◽  
Potiguar Basin ◽  
Middle Slope ◽  
Sw Atlantic ◽  
Sediment Layers ◽  
Lower Slope

Living benthic foraminifera (>63 µm) were studied to characterize the continental slope of the Potiguar Basin (SW Atlantic). Foraminifers from the surface (0–2 cm), subsurface (2–5 cm), and integrated (0–5 cm) sediment layers were analyzed to verify their contribution to environmental characterization. It was also estimated if and which changes occur when the subsurface is added. Sampling stations were distributed in five transects in four isobaths (150, 400, 1000, and 2000 m). Sediment samples were fixed with 4% buffered formaldehyde and stained with Bengal rose. Were recorded 396 species in the surface layer, 228 in the subsurface, and 449 in integrating both layers. This study did not include tubular agglutinated species. The assemblages from 150 m isobath indicated the upper slope, from 400 m indicated the middle slope and the ones from the 2000 m indicated the lower slope. The surface layer’s assemblage at 1000 m isobath was more similar to the middle slope; in contrast, its subsurface layer´s assemblage had more similarity with the lower slope. Rarefaction curves, Permanova, and NMDS routines indicated a high resemblance between surface and integrated layers. Therefore, the first two centimeters were sufficient to characterize this region based on living benthic foraminifera.

scholarly journals Contrasting lipid biomarkers in mountain rivers in the Nepal Himalayas: Organic matter characteristics and contribution to the fluvial carbon pool

2021 ◽  
pp. 101231
Author(s):  
Rajendra Bhandari ◽  
Joyanto Routh ◽  
Subodh Sharma ◽  
Rajendra Joshi
Keyword(s):  
Organic Matter ◽  
Carbon Pool ◽  
Lipid Biomarkers ◽  
Mountain Rivers

Organic matter characterization of the Lower Cretaceous tight reservoirs in the Danish North Sea

2021 ◽  
Vol 238 ◽  
pp. 103714
Author(s):  
Arka Rudra ◽  
Hamed Sanei ◽  
H.P. Nytoft ◽  
H.I. Petersen ◽  
Carlette Blok ◽  
...  
Keyword(s):  
Organic Matter ◽  
North Sea ◽  
Lower Cretaceous ◽  
Tight Reservoirs

Sources and compositional characterization of chromophoric dissolved organic matter in a Hainan tropical mangrove-estuary

2021 ◽  
pp. 126572
Author(s):  
Lu Yan ◽  
Xianjun Xie ◽  
Kang Peng ◽  
Ningdi Wang ◽  
Yuyao Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Chromophoric Dissolved Organic Matter ◽  
Mangrove Estuary ◽  
Compositional Characterization
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