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Deciphering Competitive Interactions of Natural Organic Matter Components at Metal Oxides: Insights from Experiments
Yun Xu1,2, Tjisse Hiemstra1, Yilina Bai1,3
1Soil Chemistry and Chemical Soil Quality Group, Wageningen University & Research, Wageningen 6708 PB, The Netherlands.
Fulvic acid (FA) effectively limits humic acid (HA) adsorption to mineral surfaces, impacting nutrient transport and soil carbon storage. This competition is driven by space limitations at the mineral interface.
Area of Science:
- Environmental Chemistry
- Soil Science
- Geochemistry
Background:
- Natural organic matter (NOM), a mix of humic acid (HA) and fulvic acid (FA), interacts with metal oxides.
- Understanding competitive adsorption is crucial for environmental processes, yet data and models are limited.
Purpose of the Study:
- To quantify the competitive adsorption between HA and FA on goethite.
- To investigate the molecular fractionation of HA and FA during adsorption.
- To develop mechanistic models for NOM adsorption.
Main Methods:
- UV-vis spectroscopy
- Acid precipitation
- Size exclusion chromatography (SEC)
- Consistent Competitive Ligand and Charge Distribution (LCDcc) modeling
Main Results:
- FA significantly reduces HA adsorption to goethite on a mass basis.
- Interfacial space limitation is the primary mechanism, where FA blocks HA access to surface sites.
- A high HA/FA mass exchange ratio (approx. 2.4) was observed, influencing oxyanion mobility.
Conclusions:
- FA competitively displaces HA from mineral surfaces due to steric hindrance.
- NOM partitioning affects the environmental fate of nutrients like arsenate and phosphate.
- Selective preservation of NOM by mineral association is key for soil carbon sequestration.
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