Advanced Thermal Characterization of Fractionated Natural Organic Matter

2005 ◽  
Vol 34 (3) ◽  
pp. 842-853 ◽  
Author(s):  
Rossane C. DeLapp ◽  
Eugene J. LeBoeuf ◽  
Jie Chen ◽  
Baohua Gu
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Thermal Characterization

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 Molecular characterization of an end-residue of humeomics applied to a soil humic acid

RSC Advances ◽  
2014 ◽  
Vol 4 (45) ◽  
pp. 23658-23665 ◽  
Author(s):  
A. Nebbioso ◽  
A. Piccolo ◽  
M. Lamshöft ◽  
M. Spiteller
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Molecular Characterization ◽  
Natural Organic Matter ◽  
Molecular Composition ◽  
Chemical Fractionation ◽  
Soil Humic Acid

Humeomics encompasses step-wise chemical fractionation and instrumental determination to fully characterize the heterogeneous molecular composition of natural organic matter.

scholarly journals Characterization of interactions between natural organic matter and metals by tangential-flow ultrafiltration and ICP OES

2011 ◽  
Vol 22 (1) ◽  
pp. 98-103 ◽  
Author(s):  
Adilson C. Santos ◽  
Luciane P. C. Romão ◽  
Valéria L. de Oliveira ◽  
Mônica C. Santos ◽  
Carlos A. B. Garcia ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Icp Oes ◽  
Tangential Flow

Characterization of Natural Organic Matter by Nuclear Magnetic Resonance Spectroscopy

1997 ◽  
Author(s):  
Jerry A. Leenheer
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Organic Matter ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Natural Organic Matter ◽  
Major Elements ◽  
Structure Information ◽  
Abundant Element ◽  
Nuclear Magnetic

Natural organic matter (NOM) is a major intermediate in the global carbon, nitrogen, sulfur, and phosphorus cycles. NOM is also the environmental matrix that frequently controls binding, transport, degradation, and toxicity of many organic and inorganic contaminants. Despite its importance, NOM is poorly understood at the structural chemistry level because of its molecular complexity and heterogeniety. Nuclear magnetic resonance (NMR) spectroscopy is one of the most useful spectrometric methods used to investigate NOM structure because qualitative and quantitative organic structure information for certain organic elements can be generated by NMR for NOM in both the solution and solid states under nondegradative conditions. However, NMR spectroscopy is not as sensitive as infrared or ultraviolet-visible spectroscopy; it is not at present applicable to organic oxygen and sulfur, and quantification of NMR spectra is difficult under certain conditions. The purpose of this overview is to present briefly the “state of the art” of NMR characterization of NOM, and to suggest future directions for NMR research into NOM. More comprehensive texts concerning the practice of NMR spectroscopy and its application to NOM in various environments have been produced by Wilson and by Wershaw and Mikita. Carbon, hydrogen, and oxygen are the major elements of NOM; together they comprise about 90% of the mass. The minor elements that constitute the remainder are nitrogen, sulfur, phosphorus, and trace amounts of the various halogen elements. With the exception of coal, in which carbon is the most abundant element, the order of relative abundance in NOM on an atomic basis is H > C > O > N > S > P = halogens. The optimum NMR-active nuclei for these elements are 1H, 13C, 17O, 15N, 33S, 31P, and 19F. The natural abundances and receptivities of these nuclei relative to 1H are given in Table 12.1. Quadrupolar effects for 17O, 33S, and halogen elements other than 19F lead to line broadening that greatly limits resolution in NMR studies of these elements in NOM.

Characterization of natural organic matter adsorption in granular activated carbon adsorbers

2011 ◽  
Vol 45 (13) ◽  
pp. 3951-3959 ◽  
Author(s):  
Silvana Velten ◽  
Detlef R.U. Knappe ◽  
Jacqueline Traber ◽  
Hans-Peter Kaiser ◽  
Urs von Gunten ◽  
...  
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Natural Organic Matter ◽  
Granular Activated Carbon
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