1H NMR spectra of humic and fulvic acids and their peracetic oxidation products

Ruggiero, P.; Interesse, Francesco S.; Cassidei, L.; Sciacovelli, O.

doi:10.1016/0016-7037(80)90252-5

Cited by 24 publications

(8 citation statements)

References 16 publications

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“…The humic matter is generally extracted by NaOH solution, but an identical result is achieved using HCl extraction (Schnitzer and Skinner 1968). The HC10 4 used in the present study, however, caused partial oxidation and degradation of the humic macromolecules (Maximov et al 1977 andRuggiero et al 1980). Nevertheless, the results correlate with those obtained from NaOH extraction and seem to represent total humus.…”

Section: Some Comments On Geochemical Methodscontrasting

confidence: 53%

Stratigraphical studies on Lake Iidesjärvi sediments. Part II. Geological and mineralogical characteristics of the sedimentary sequence

Vuorinen¹,

Uusinoka²,

Alhonen³

1983

Bull Geol Soc Finland

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Section: Some Comments On Geochemical Methodscontrasting

confidence: 53%

Stratigraphical studies on Lake Iidesjärvi sediments. Part II. Geological and mineralogical characteristics of the sedimentary sequence

Vuorinen¹,

Uusinoka²,

Alhonen³

1983

Bull Geol Soc Finland

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“…In addition, side chains of peptides, O, and N-acetyl polysaccharides, carbohydrates, ether bridges of lignins, etc. contribute to aliphatic region. , As a result, the labile hydrogens of functionalized moieties can overlap with resonances of backbone hydrogens when aprotic solvents are used for dissolution. , At the same time, when NaOD/D 2 O is used as a solvent, all exchangeable protons of NOM and HDO appear as a single coalescent peak in the range of 4.5–4.8 ppm due to fast (on the NMR time scale) exchange …”

Section: Introductionmentioning

confidence: 99%

The Structural Arrangement and Relative Abundance of Aliphatic Units May Effect Long-Wave Absorbance of Natural Organic Matter as Revealed by ¹H NMR Spectroscopy

Perminova

Shirshin

Konstantinov

et al. 2018

Environ. Sci. Technol.

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The objective of this study was to shed light on structural features which underlay intensity of long wave absorbance of natural organic matter (NOM) using 1 H NMR spectroscopy. For this purpose, a set of the NOM samples was assembled from arctic and nonarctic sampling sites (the Kolyma river basin and Moscow region, respectively). It was to ensure a substantial difference in the humification degree of the isolated organic matterthe biogeochemical proxy of the long-wave absorbance of NOM. The assembled NOM set was analyzed using solution-state 1 H NMR spectroscopy. The distribution of both backbone and exchangeable protons was determined using acquisition of spectra in three different solvents. The substantially higher contribution of nonfunctionalized aliphatic moieties CHn (e.g., materials derived from linear terpenoids, MDLT) in the arctic NOM samples was revealed as compared to the nonarctic ones. The latter were characterized with the higher content of CHα protons adjacent to electron-withdrawing groups which belong to carboxyl rich alicyclic moieties (CRAMs) or to aromatic constituents of NOM. We have calculated a ratio of CHn to CHα protons as a structural descriptor which showed significant inverse correlation to intensity of long wave absorbance assessed with a use of E 4 /E 6 ratio and the slope of absorption spectrum. The steric hindrance of aromatic chromophoric groups of the NOM ensemble by bulky nonfunctionalized aliphatic moieties (e.g., MDLT) was set as a hypothesis for explanation of this phenomenon. The bulky aliphatics might increase a distance between the interacting groups resulting in inhibition of electronic (e.g., charge-transfer) interactions in the NOM ensemble. The obtained relationships were further explored using Fourier transform mass spectrometry as complementary technique to 1 H NMR spectroscopy. The data obtained on correlation of molecular composition of NOM with 1 H NMR data and optical properties were very supportive of our hypothesis that capabilities of NOM ensemble of charge transfer interactions can be dependent on structural arrangement and relative abundance of nonabsorbing aliphatic moieties.

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“…All spectra are characterized with prominent intensity of α-aliphatic region (1.6-3.1 ppm). The presence of lesser-substituted aromatic components and abundance in carbohydrates is a characteristic feature of FA according to the reported 1 H NMR data [49][50][51]. Distribution of non-exchangeable protons was much less characteristic of peculiar structural features of the parent FA versus its SPE isolates and did not reveal the differences, which could be clearly seen from the 13 C NMR data.…”

Section: Nmr Resultsmentioning

confidence: 78%

Comparative Studies on Sorption Recovery and Molecular Selectivity of Bondesil PPL versus Bond Elut PPL Sorbents with Regard to Fulvic Acids

Khreptugova

Mikhnevich

Molodykh

et al. 2021

Water

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Large scale isolation—in gram quantities—of dissolved organic matter (DOM) from natural waters is necessary for detailed investigation of its role in chemical and microbial processes driving carbon cycling under conditions of global climate change. The best candidate for a use in these large-scale experiments is a bulk sorbent Bondesil PPL, which has the same modification as the widely used Bond Elut PPL sorbent. There have been no studies so far reported on interchangeability of these sorbents with regard to DOM isolation. This work was devoted to comparative studies on sorption efficiency and molecular selectivity of these two sorbents—Bond Elut PPL and Bondesil PPL with regard to DOM components. Fulvic acids (FA) from peat water leachate were used as a model DOM. Laboratory solid phase extraction (SPE) setup was used for monitoring sorption recovery and extraction yield. It included three parallel experiments on pre-packed Bond Elut PPL cartridges (500 mg/3 mL) and three self-packed Bondesil PPL cartridges (500 mg/3 mL). Fourier transform ion cyclotron resonance mass spectrometry (FT ICR MS) and 13C/1H nuclear magnetic resonance (NMR) spectroscopy were used for determination of molecular and structural group compositions of the FA isolates obtained with a use of two different sorbents. The results of this study allowed a conclusion on interchangeability of the two sorbents used in this study for the purposes of DOM isolation from natural waters. This conclusion was backed up by similarity of sorption behavior of the peat FA components on both sorbents and by high similarity of molecular compositions and carbon distribution among the main structural groups.

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1H NMR spectra of humic and fulvic acids and their peracetic oxidation products

Cited by 24 publications

References 16 publications

Stratigraphical studies on Lake Iidesjärvi sediments. Part II. Geological and mineralogical characteristics of the sedimentary sequence

Stratigraphical studies on Lake Iidesjärvi sediments. Part II. Geological and mineralogical characteristics of the sedimentary sequence

The Structural Arrangement and Relative Abundance of Aliphatic Units May Effect Long-Wave Absorbance of Natural Organic Matter as Revealed by ¹H NMR Spectroscopy

Comparative Studies on Sorption Recovery and Molecular Selectivity of Bondesil PPL versus Bond Elut PPL Sorbents with Regard to Fulvic Acids

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1H NMR spectra of humic and fulvic acids and their peracetic oxidation products

Cited by 24 publications

References 16 publications

Stratigraphical studies on Lake Iidesjärvi sediments. Part II. Geological and mineralogical characteristics of the sedimentary sequence

Stratigraphical studies on Lake Iidesjärvi sediments. Part II. Geological and mineralogical characteristics of the sedimentary sequence

The Structural Arrangement and Relative Abundance of Aliphatic Units May Effect Long-Wave Absorbance of Natural Organic Matter as Revealed by 1H NMR Spectroscopy

Comparative Studies on Sorption Recovery and Molecular Selectivity of Bondesil PPL versus Bond Elut PPL Sorbents with Regard to Fulvic Acids

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The Structural Arrangement and Relative Abundance of Aliphatic Units May Effect Long-Wave Absorbance of Natural Organic Matter as Revealed by ¹H NMR Spectroscopy