Structural Investigations: Nuclear Magnetic Resonance Spectroscopy Investigations of Silylated Refractory Organic Substances

Hertkorn, Norbert; Günzl, A.; Freitag, D.; Kettrup, A.

doi:10.1002/9783527611195.ch2f

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…However, progress has been made by introducing techniques like dipolar decoupling (DD), cross polarization magic-angle spinning (CPMAS), DEPT (distortionless enhancement by polarization transfer), INEPT (insensitive nuclei enhanced by polarization transfer) and others. A major effort in the characterization of aqueous HS was made during the ROSIG project using 1 H NMR, 13 C NMR, 15 N NMR, and 2-D NMR techniques for the same set of reference samples (Haiber et al, 2002;Hertkorn et al, 2002;Lambert and Lankes, 2002;Lankes and Lüdemann, 2002).…”

Section: Nmrmentioning

confidence: 99%

Structural characterization of aquatic humic substances ? The need for a multiple method approach

Abbt‐Braun

Lankes

Frimmel

2004

Aquatic Sciences - Research Across Boundaries

154

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An overview of different characterization methods and the possibilities for describing structural elements of humic substances from aqueous environments (HS, or refractory organic substances (ROS)) is given within this review. The application of different analytical methods for the qualitative and quantitative characterization of HS, including physical/chemical analysis (elemental analysis, acid/base titration), spectroscopic methods (UV/VIS, NMR, fluorescence, mass spectrometry), fractionation methods (gel chromatography, flow-fieldflow-fractionation), and degradation methods (oxidation, Aquatic Sciences pyrolysis, hydrolysis) are discussed. The paper focuses on the most commonly used chemical, spectroscopic and chromatographic methods used in the last few years. Aspects concerning information related to newer procedures are considered. Case studies representing results gained from reference samples isolated from brown water and wastewater effluents are given to cross-check results gained from several methods. The influence of different isolation procedures on the specific character of the fractions is also discussed.

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Section: Nmrmentioning

confidence: 99%

Structural characterization of aquatic humic substances ? The need for a multiple method approach

Abbt‐Braun

Lankes

Frimmel

2004

Aquatic Sciences - Research Across Boundaries

154

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“…This study is notable, as it illustrates the potential of silylation in combination with NMR for characterization of functional groups of NOM, although no attempt was made to characterize the molecular structures carrying these groups. 73 3.4. Other Reagents.…”

Section: Hexamethyldisilazane (Hmds)mentioning

confidence: 99%

“…The relative abundances of these functional groups were compared between different samples. This study is notable, as it illustrates the potential of silylation in combination with NMR for characterization of functional groups of NOM, although no attempt was made to characterize the molecular structures carrying these groups …”

Section: Silylation Of Nommentioning

confidence: 99%

Molecular Tagging for the Molecular Characterization of Natural Organic Matter

York

Bell

2020

Environ. Sci. Technol.

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Natural organic matter (NOM) is the product of microbial and abiotic decay of plant and animal remains in terrestrial and aquatic ecosystems. On a molecular level, NOM is a complex mixture of organic molecules, of which the vast majority of structures are unknown. By identifying these molecules, our understanding of the many functions of NOM could be greatly enhanced. However, given that they are chromatographically inseparable and number in the thousands, traditional analytical techniques have proven unable to achieve this goal. A promising approach to enumerate functional groups and elucidate molecular structures within NOM is based on a combination of molecular tagging and high resolution spectroscopic techniques, such as nuclear magnetic resonance spectroscopy and mass spectrometry. Molecular tagging involves the selective modification of particular functional groups, inserting nuclei to act as reporters on their surrounding chemical environment. This allows examination of only the tagged molecules within NOM, thereby reducing the complexity of the mixture. In this review, the effectiveness of molecular tagging methods incorporating carbon, silicon, nitrogen, phosphorus, and deuterium into NOM are discussed. Some potential tagging methods which have not yet been applied to NOM are also presented.

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Molecular Level Structural Analysis of Natural Organic Matter and of Humic Substances by Multinuclear and Higher Dimensional NMR Spectroscopy

Hertkorn

Kettrup

NATO Science Series

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Structural Investigations: Nuclear Magnetic Resonance Spectroscopy Investigations of Silylated Refractory Organic Substances

Cited by 5 publications

References 18 publications

Structural characterization of aquatic humic substances ? The need for a multiple method approach

Structural characterization of aquatic humic substances ? The need for a multiple method approach

Molecular Tagging for the Molecular Characterization of Natural Organic Matter

Molecular Level Structural Analysis of Natural Organic Matter and of Humic Substances by Multinuclear and Higher Dimensional NMR Spectroscopy

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