[1H] and [13C]NMR studies on the importance of aromatic structures in fulvic and humic acids

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

doi:10.1016/0016-7037(79)90025-5

Cited by 36 publications

(13 citation statements)

References 16 publications

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“…Significant features are the absence of a -CH20H peak at 6-62 ppm and minima1 absorbance 2 : 1. The presence of both aliphatic and aromatic components is consistent with other observations on the I3C nmr spectra of fulvic acids from soil and water (Ruggiero et al, 1979;Stuermer & Payne, 1976), and the ' H nmr spectra of fulvic acids and humic acids (Ruggiero et a/., 1979(Ruggiero et a/., , 1980. I3C nmr spectra have provided similar information for humic acids in whole soils (Barron et al, 1980.…”

Section: Spectroscopic Studiessupporting

confidence: 89%

“…The contributions of Schnitzer & Khan (l972), Anderson et al (1976Anderson et al ( , 1977, Ruggiero et al (1979Ruggiero et al ( , 1980, BufRe et af. (1977,1979) and Brady & Pagenkopf (1978) are noteworthy.…”

Section: Introductionmentioning

confidence: 97%

“…Several workers have added to our understanding of the structure and metal-binding properties of soil-derived fulvic acids. The contributions of Schnitzer & Khan (l972), Anderson et al (1976Anderson et al ( , 1977, Ruggiero et al (1979Ruggiero et al ( , 1980, BufRe et af. (1977,1979) and Brady & Pagenkopf (1978) are noteworthy.…”

Section: Introductionmentioning

confidence: 99%

“…BufRe et al (1977) and Brady & Pagenkopf (1978) have estimated average gram formula weights from metal ion uptake measurements at constant pH. Early work suggested both distinctly aromatic (Schnitzer, 1976) and distinctly aliphatic (Anderson & Russell, 1976) structures for fulvic acid, but with improved I3C methodology Ruggiero et al (1979Ruggiero et al ( , 1980 and have produced spectra indicating both aliphatic and aromatic components.…”

Section: Introductionmentioning

confidence: 99%

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Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

Cressey

Monk

Powell

et al. 1983

Journal of Soil Science

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The reactions of two fulvic acid samples with Cu2+ and Cd2+ have been studied by potentiometric titration (pH and ion selective electrode). The metal-uptake curves for samples initially rendered 'metal-free' by a precipitation-solvent extraction technique resemble those for citric and malic acids at soil pH (4-6.5). The presence of aliphatic and aromatic components was established by I3C nmr spectroscopy; the presence of phenolic components was inferred from pH titrations. It is shown that a polycarboxylate component (simulated by citrate) would mask reactions of phenolic components with metals in weakly acidic and neutral media. The mode of coordination between fulvic acid and metals will vary with pH and with the metal : fulvic acid ratio.

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Section: Spectroscopic Studiessupporting

confidence: 89%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

Cressey

Monk

Powell

et al. 1983

Journal of Soil Science

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“…Elemental analysis has been commonly applied to isolated humic substances (Huffman and Stuber, 1985;Peschel and Wildt, 1988;Thurman and Malcolm, 1981), and therefore comparison with published data for "typica]" natura] waters is possible. 'H NMR spectroscopy has also been previously applied to humic substances (Grasso et at., 1990;Thorn, 1987;Wershaw, 1985), along with 13CNMR spectroscopy on both liquid samples (Ruggiero et a!., 1979;Thorn, 1987) and solid samples (Tao et at., 1994). 'H NMR was chosen for this work because the low organic content of the samples of interest precluded the isolation of sufficient material for 13CNMR analysis, which requires significantly greater amounts of sample than the more sensitive 'H NMR technique.…”

Section: Approachmentioning

confidence: 99%

Identification of wastewater dissolved organic carbon characteristics in reclaimed wastewater and recharged groundwater

Fujita¹,

Ding²,

Reinhard³

1996

Water Environment Research

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Nonvolatile dissolved organic carbon (DOC) in reclaimed wastewaters and groundwater was characterized and indicators of wastewater origin were identified. Over 50% of the DOC in activated carbon and reverse osmosis effluents was classified as hydrophilic, and no humic acid was isolated. In groundwater partially recharged by the reclaimed wastewaters, only 16% of the DOC was hydrophilic, 50% of the DOC was fulvic acid, and humic acid was recovered. The H:C ratios of the isolated fulvic acids were higher in the wastewaters and recharged groundwater than in a deep well water not affected by recharge. N:C ratios in the wastewater and recharged groundwater fulvic and humic acid fractions were also higher than in the deep well water. The 'H NMR spectra of the effluent and recharged groundwater fulvic acid fractions exhibited a characteristic fingerprint pattern, indicating a correlation between origin and spectral appearance. Gas chromatographymass spectrometry analysis confirmed the presence of specific trace organic compounds, including EDTA and alkylphenol polyethoxylate residues, in the wastewaters and recharged groundwater. Water Environ.

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Humic Substances. Structural Aspects, and Photophysical, Photochemical and Free Radical Characteristics

Choudhry

1984

The Handbook of Environmental Chemistry

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[1H] and [13C]NMR studies on the importance of aromatic structures in fulvic and humic acids

Cited by 36 publications

References 16 publications

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

Fulvic acid studies: evidence for a polycarboxylate co‐ordination mode at soil pH

Identification of wastewater dissolved organic carbon characteristics in reclaimed wastewater and recharged groundwater

Humic Substances. Structural Aspects, and Photophysical, Photochemical and Free Radical Characteristics

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