15N NMR Investigation of the Covalent Binding of Reduced TNT Amines to Soil Humic Acid, Model Compounds, and Lignocellulose

2002 ◽  
Vol 36 (17) ◽  
pp. 3787-3796 ◽  
Author(s):  
K. A. Thorn ◽  
K. R. Kennedy
Keyword(s):  
Humic Acid ◽  
Covalent Binding ◽  
15N Nmr ◽  
Model Compounds ◽  
Soil Humic Acid

scholarly journals Studies on The Metabolism of Model Compounds Related to Soil Humic Acid I. The Decomposition of N-(O-Carboxyphenyl)Glycine

1964 ◽  
Vol 17 (1) ◽  
pp. 153 ◽  
Author(s):  
JN Ladd
Keyword(s):  
Amino Acid ◽  
Humic Acid ◽  
Nitrogen Atom ◽  
Aromatic Ring ◽  
Model Compound ◽  
Model Compounds ◽  
Adaptation Studies ◽  
Soil Humic Acid ◽  
Achromobacter Sp

An Achromobacter sp. which has been isolated from Urrbrae loam adaptively oxidizes N -(o-carboxyphenyl)glycine, selected as a model compound since it con� tains an aromatic ring bonded directly to the nitrogen atom of an a-amino acid, as proposed for humic acid polymers. Simultaneous adaptation studies indicate that this compound is metabolized via anthranilate, 5-hydl'Oxyanthranilate, and 2,5- dihydroxybenzoate. The rate of oxidation of N -(o-carhoxyphenyl)glycine is inhibited by N.methyianthranilate and salicylate, the latter by inhibiting the conversion of anthranilate to 5-hydroxyanthranilate.

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.

Synthesis and chromatographic characterization of [Tc-99m]technetium-humic acid species

2000 ◽  
Vol 88 (2) ◽  
Author(s):  
D. Rößler ◽  
K. Franke ◽  
R. Süß ◽  
E. Becker ◽  
H. Kupsch
Keyword(s):  
Humic Acid ◽  
Stannous Chloride ◽  
Gel Permeation Chromatography ◽  
Paper Electrophoresis ◽  
Gel Permeation ◽  
Soil Humic Acid ◽  
Chromatographic Characterization ◽  
Ph Dependent ◽  
Layer Chromatography

A natural moor soil humic acid (HA) was labeled with Tc-99m via reduction of pertechnetate with stannous chloride. The humic acid species obtained were characterized by thin layer chromatography (TLC), gel permeation chromatography (GPC), sequential chromatographic analysis (SCA), paper electrophoresis and micropore filtration. Labeling was found to take place in all ranges of molecular weight. Due to the complex humic acid composition and the formation of hydroxo species the labeling yields strongly depend on the separation conditions, ranging from 42% to 80%. The pH-dependent distribution of mobile and immobile species was determined by SCA for HTcO

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.

Characteristics of soil humic acid fractions separated by ultrafiltration

1997 ◽  
Vol 28 (9-10) ◽  
pp. 787-796 ◽  
Author(s):  
J. C. Lobartini ◽  
G. A. Orioli ◽  
K. H. Tan
Keyword(s):  
Humic Acid ◽  
Soil Humic Acid

Near edge X-ray absorption fine structure (NEXAFS) of model compounds for the humic acid/actinide ion interaction

2005 ◽  
Vol 148 (3) ◽  
pp. 151-157 ◽  
Author(s):  
Markus Plaschke ◽  
Jörg Rothe ◽  
Marcus Altmaier ◽  
Melissa A. Denecke ◽  
Thomas Fanghänel
Keyword(s):  
Fine Structure ◽  
Humic Acid ◽  
Model Compounds ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

Structure of Soil Humic Acid. II. Some Copper Oxide Oxidation Products1-3

1962 ◽  
Vol 27 (1) ◽  
pp. 170-174 ◽  
Author(s):  
GISELE GREENE ◽  
CORNELIUS STEELINK
Keyword(s):  
Humic Acid ◽  
Copper Oxide ◽  
Soil Humic Acid

scholarly journals Binding of cadmium to soil humic acid as a function of carboxyl group content

2010 ◽  
Vol 29 (2) ◽  
pp. 215 ◽  
Author(s):  
Tatjana Anđelković ◽  
Ružica Nikolić ◽  
Aleksandar Bojić ◽  
Darko Anđelković ◽  
Goran Nikolić
Keyword(s):  
Humic Acid ◽  
Binding Constants ◽  
Formation Constants ◽  
Carboxyl Groups ◽  
Complexation Reaction ◽  
Infrared Spectroscopic Analysis ◽  
Soil Humic Acid ◽  
Carboxyl Group Content ◽  
The Stability ◽  
Scatchard Plots

The binding of Cd(II) to soil humic acid (HA) at pH 6.5 and in 0.1 mol/L KNO3 ionic medium, was studied by potentiometric titration with a cadmium ion selective electrode. The influence of carboxyl groups in cation-humic interactions was investigated by selective blocking of humic acid carboxyl groups with thionyl chloride and methanol. Infrared spectroscopic analysis confirmed that esterification took place. Differences between underivatized and derivatized HA complexation properties are ascribed to carboxyl groups. The Scatchard plots and incremental formation constants were used to obtain values for Cd-binding constants, for both HAs. The derivatization decreased the number of HA complexing sites by approximately 60 %, which correlates with acid-base properties of both HAs, studied by barium hydroxide and calcium acetate exchange methods. The stability constants for binding at the strongest sites (logKINT) was larger for underivatized HA (5.40) than for derivatized HA (4.92), indicating greater stability in the case when carboxyl groups are involved in complexation reaction.

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