Results 111 to 120 of about 757 (137)
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TMAH thermochemolysis characterization of marine sedimentary organic matter in a Newfoundland fjord
Organic Geochemistry, 2003Abstract Marine sedimentary organic matter of Trinity Bay and its associated fjord, the Northwest Arm (Newfoundland), was characterized by “batch-wise” tetramethyl ammonium hydroxide (TMAH) thermochemolysis. TMAH thermochemolysis products were characterized using GC/MS, and they included aromatic and aliphatic compounds determined as methyl esters ...
K.Jerry Pulchan +2 more
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Science of The Total Environment, 2015
Tetramethylammonium hydroxide-assisted thermochemolysis performed in an off-line mode proved a useful tool in determining organic compounds in the effluent from laboratory-scale phytoremediation systems. Studies were performed with artificial wastewaters contaminated with xylenols and densely rooted Juncus effuses plants.
Juergen, Poerschmann +1 more
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Tetramethylammonium hydroxide-assisted thermochemolysis performed in an off-line mode proved a useful tool in determining organic compounds in the effluent from laboratory-scale phytoremediation systems. Studies were performed with artificial wastewaters contaminated with xylenols and densely rooted Juncus effuses plants.
Juergen, Poerschmann +1 more
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Journal of Analytical and Applied Pyrolysis, 1999
Abstract Aromatic aldehydes are well known products in the pyrolysis of humic substances, polysaccharides, lignins and wood species. Our studies with model compounds show that these aldehydes undergo a disproportionation/methylation or disproportionation/butylation reaction if pyrolysis is carried out in the presence of tetramethylammonium hydroxide (
I. Tanczos, K. Rendl, H. Schmidt
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Abstract Aromatic aldehydes are well known products in the pyrolysis of humic substances, polysaccharides, lignins and wood species. Our studies with model compounds show that these aldehydes undergo a disproportionation/methylation or disproportionation/butylation reaction if pyrolysis is carried out in the presence of tetramethylammonium hydroxide (
I. Tanczos, K. Rendl, H. Schmidt
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Tetramethylammonium hydroxide (TMAH) thermochemolysis of 2-arylcoumaran lignin model compounds
Journal of Analytical and Applied Pyrolysis, 2009Abstract Phenolic 2-arylcoumarans 1 – 6 were used to examine the behaviors of β-5 subunits in lignin during tetramethylammonium hydroxide (TMAH) thermochemolysis. Products were monitored by gas chromatography/mass spectrometry. The process predominantly provided dimeric products with the opened hydrofuran ring. Substituent changes at the γ-position
Ken-ichi Kuroda +3 more
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Journal of Chromatography A, 2009
A simple and direct approach was developed for thermochemolytic analysis of a wide range of biomolecules present in plant materials using an injection port of a gas chromatograph/mass spectrometer (GC/MS) and a novel solids injector consisting of a coiled stainless steel wire placed inside a modified needle syringe.
Farzad, Shadkami, Robert, Helleur
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A simple and direct approach was developed for thermochemolytic analysis of a wide range of biomolecules present in plant materials using an injection port of a gas chromatograph/mass spectrometer (GC/MS) and a novel solids injector consisting of a coiled stainless steel wire placed inside a modified needle syringe.
Farzad, Shadkami, Robert, Helleur
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Soil Science Society of America Journal, 2000
Tetramethylammonium hydroxide (TMAH) thermochemolysis–gas chromatography/mass spectrometry (GC/MS) was employed to study the chemical structure of soil organic matter sampled from a soil plot in which corn ( Zea mays L.) was farmed continuously for 15 yr.
Benny Chefetz +3 more
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Tetramethylammonium hydroxide (TMAH) thermochemolysis–gas chromatography/mass spectrometry (GC/MS) was employed to study the chemical structure of soil organic matter sampled from a soil plot in which corn ( Zea mays L.) was farmed continuously for 15 yr.
Benny Chefetz +3 more
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Derivatization and Thermochemolysis Treatment aboard the MOMA experiment
2019The Mars Organic Molecule Analyzer (MOMA) experiment onboard the ExoMars 2020 rover will analyze the content in organic molecules present in samples collected at subsurface of Mars. MOMA has two complementary analytical modes : Laser Desorption/Ionization-Mass Spectrometry and Pyrolysis-Gas Chromatography-Mass Spectrometry. In addition to the pyrolysis
Grand, N. +14 more
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Journal of Analytical and Applied Pyrolysis, 2013
Abstract Thermally assisted hydrolysis and methylation (THM) in the presence of tetramethylammonium hydroxide (TMAH) of a range of layers in eight peat cores from the Ryggmossen peatland (central Sweden) was carried out. This yielded a complex mixture including components I (methylated 4-isopropenylphenol (IUPAC name: 1-methoxy-4-(prop-1-en-2-yl ...
Swain EY, Abbott GD
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Abstract Thermally assisted hydrolysis and methylation (THM) in the presence of tetramethylammonium hydroxide (TMAH) of a range of layers in eight peat cores from the Ryggmossen peatland (central Sweden) was carried out. This yielded a complex mixture including components I (methylated 4-isopropenylphenol (IUPAC name: 1-methoxy-4-(prop-1-en-2-yl ...
Swain EY, Abbott GD
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Analysis of lichens under environmental stress using TMAH thermochemolysis–gas chromatography
Journal of Analytical and Applied Pyrolysis, 2001Abstract Plants often react to various kinds of stress by changes in their organic composition as the result of defense or stress-induced metabolism. This study investigated the use of lichens as stress monitors by examining changes in their chemistry under various environmental conditions.
T. MacGillivray, R. Helleur
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