Organic solute changes with acidification in lake Skjervatjern as shown by 1H-NMR spectroscopy

Malcolm, Ronald L.; Hayes, Thomas

doi:10.1016/0160-4120(94)90113-9

Cited by 10 publications

(2 citation statements)

References 4 publications

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“…Published reports (Malcolm andHayes, 1994, Rodríguez Vidal et al 1999) describe the isolation and purification of the hydrophilic acid fraction using this resin. However, Christensen et al (1998) reported that it only retains a minimum fraction of what remains after having previously removed humic and fulvic acids (4.4% of the total COD, leaving 24% of the total accounted for).…”

Section: Treatment Of the Effluents Resulting From The Biological Promentioning

confidence: 99%

Removal of non-biodegradable organic matter from landfill leachates by adsorption

Rodríguez¹,

Castrillón²,

Marañón³

et al. 2004

Water Research

143

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Section: Treatment Of the Effluents Resulting From The Biological Promentioning

confidence: 99%

Removal of non-biodegradable organic matter from landfill leachates by adsorption

Rodríguez¹,

Castrillón²,

Marañón³

et al. 2004

Water Research

143

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“…Whereas more traditional methods of organic geochemistry (for instance the operationally defined separation of DOC into hydrophobic and hydrophilic acid, base, and neutral fractions) did only reveal slight decreases in the hydrophobic/hydrophilic ratio [30,31], Malcolm and Hayes [32] found distinct changes in the composition characterizing DHM by 1 H NMR spectroscopy. After one year of acidification, fulvic acids decreased by 13 % in protons on carbon attached to N and O heteratoms and between 27 and 31 % in aromatic protons.…”

Section: Alterations Of the Humic Substances Due To Deposition Of Minmentioning

confidence: 94%

Changes of Humic Substance Constituents in Großer Arbersee during Acidification

Steinberg¹,

Hoppe

Jüttner

et al. 2001

Acta hydrochim. hydrobiol.

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Sediment humic substances from an acidification chronology (210Pb‐ and 137Cs‐dating) of Großer Arbersee, a small cirque lake in the Bavarian Forest, Germany, have been studied by means of 1H NMR spectroscopy. The acidification of the lake and, particularly, its catchment caused a more or less continuous decrease in diatom‐inferred pH from 5.4 to 4.75. Combined with diagenetic processes in the sediment, acidification reduced the bulk concentration of humic material in the water column and altered the composition of humic material, too: The share of humic acids (IHSS protocol) increased from 12 to 17% of the total humic carbon. Statistically, the reduced pH values account for 60%. While the constituents changed in the fulvic acid fraction, they remained more or less unchanged in the humic acid fraction. Within the fulvic acid fraction, percentages of carbohydrates increase, whereas those of aliphatic as well as aromatic compounds decrease. These changes may be explained (a) by reductions in enzymatic activity, particularly of cellulases and proteases, in the raw humic material in the catchment, (b) protonation of acidic functional groups (carboxylic acids, phenolic compounds) which leads to an immobilization and retention of these compounds in the catchment, or/and (c) by increased chemical oxidation or precipitation of the aromatic portions, leaving the more transparent aliphatic chains. As a consequence of reduced chromophoric DOC content, light penetration, particularly of UV irradiation, has increased and the biogeochemical detoxification mechanism will be reduced. The residual fauna and flora in acidified Großer Arbersee will be exposed to another severe physical and chemical stress, because acidification is generally accompanied by a variety of organic micro‐contaminants.

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Biogeochemische Regulation in limnischen Ökosystemen: Zur Ökologischen Bedeutung von Huminstoffen

Steinberg

2004

Handbuch Angewandte Limnologie: Grundlagen - Gewässerbelastung - Restaurierung - Aquatische Ökotoxikologie - Bewertung - Gewäss

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Organic solute changes with acidification in lake Skjervatjern as shown by 1H-NMR spectroscopy

Cited by 10 publications

References 4 publications

Removal of non-biodegradable organic matter from landfill leachates by adsorption

Removal of non-biodegradable organic matter from landfill leachates by adsorption

Changes of Humic Substance Constituents in Großer Arbersee during Acidification

Biogeochemische Regulation in limnischen Ökosystemen: Zur Ökologischen Bedeutung von Huminstoffen

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