Impacts of ozone oxidation and borohydride reduction on the optical properties of humic substance isolates

The optical properties of dissolved organic matter (DOM) are of interest as they are used to monitor or optimize drinking and wastewater treatment and influence the fate of contaminants in surface waters. DOM optical properties are presented as resulting either from charge-transfer (CT) interactions...

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Bibliographic Details
Published in:Aquatic sciences 2022-10, Vol.84 (4), Article 65
Main Authors: McKay, Garrett, Leresche, Frank
Format: Article
Language:English
Subjects:
Air pollution
Allochthonous deposits
Analysis
Aromatic compounds
Biomedical and Life Sciences
Borohydrides
Charge transfer
Contaminants
Dissolved organic matter
Ecology
Electromagnetic absorption
Environmental Management
Fluorescence
Freshwater & Marine Ecology
Humic substances
Life Sciences
Light absorption
Marine & Freshwater Sciences
Oceanography
Optical properties
Oxidation
Oxidation-reduction reaction
Ozone
Phenolic compounds
Phenols
Quinones
Reduction
Research Article
Sodium
Soil contamination
Soils
Surface water
The International Humic Substances Society
Wastewater
Wastewater treatment
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Summary:The optical properties of dissolved organic matter (DOM) are of interest as they are used to monitor or optimize drinking and wastewater treatment and influence the fate of contaminants in surface waters. DOM optical properties are presented as resulting either from charge-transfer (CT) interactions or from a superposition model. Herein, we present investigations of the effects of reduction (sodium borohydride) and oxidation (ozone) on the absorbance and fluorescence of three humic substance isolates of different origins (soil, autochthonous and allochthonous aquatic isolates). Both ozone and borohydride treatments induce a strong decrease in light absorption properties of the three isolates. For fluorescence, the treatments induce a fluorescence increase for the soil isolate while for the aquatic isolates, they induce either an increase or decrease. The effect of reductive or oxidative treatments is discussed using both the CT and the superposition model. The variations in the isolate’s composition (phenolic, quinones, aromatics moieties) are used to discuss the observed differences in treatments effects between the three isolates. Overall, this study provides insight into the contributions of different compound classes to DOM optical properties as explained by the CT and superposition models.
ISSN:1015-1621
1420-9055
DOI:10.1007/s00027-022-00892-1