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Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products

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Quantifying interactions between singlet oxygen and aquatic fulvic acids.

Rose M Cory¹, James B Cotner, Kristopher McNeill

¹Department of Ecology, Evolution and Behavior, University of Minnesota, 1987 Upper Buford Circle, St. Paul, Minnesota, USA.

Environmental Science & Technology

|February 28, 2009

Summary

Singlet oxygen (1O2) reacts with dissolved organic matter (DOM) in aquatic environments. This study quantifies reaction and quenching rate constants for 1O2 with fulvic acids, revealing significant interactions.

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Area of Science:

Environmental Chemistry
Photochemistry
Aquatic Chemistry

Background:

Singlet oxygen (1O2) is a reactive oxygen species generated by dissolved organic matter (DOM) in sunlit waters.
Interactions between 1O2 and DOM are not well understood, despite studies on 1O2 production by DOM.

Purpose of the Study:

To quantify the rate constants of reaction and physical quenching of 1O2 with Suwannee River and Pony Lake fulvic acids.
To compare the reactivity of 1O2 with terrestrial and microbial DOM.

Main Methods:

Fulvic acids were reacted with 1O2 generated via Rose Bengal irradiation.
Uptake of 1O2 was monitored by measuring dissolved oxygen concentrations using membrane inlet mass spectrometry (MIMS).

Main Results:

64-70% of oxygen uptake by fulvic acid solutions was attributed to reaction with 1O2.
Rate constants for reaction (krxn) and physical quenching (kphys) were determined for both Suwannee River and Pony Lake fulvic acids.
1O2 reacts with DOM on a per carbon basis at rates comparable to phenols, naphthols, or aromatic amines.

Conclusions:

Singlet oxygen significantly reacts with both microbially and terrestrially derived DOM.
The quantified rate constants provide crucial data for understanding 1O2 cycling in aquatic ecosystems.
DOM plays a dual role in aquatic photochemistry: producing 1O2 and reacting with it.