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  1. Home
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  5. Environmental Sciences
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  9. Soil Physics
  11. Modeling Of Phosphate Speciation On Goethite Surface: Effects Of Humic Acid

Modeling of phosphate speciation on goethite surface: Effects of humic acid

Yu Liang1, Jiezi Jin2, Hongfeng Chen3

  • 1Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571101, PR China.

Chemosphere
|May 18, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Humic acid (HA) significantly reduces phosphate adsorption on iron (hydr)oxides, impacting soil fertility and eutrophication. However, HA minimally affects phosphate complexation mechanisms on goethite surfaces.

Area of Science:

  • Soil Science
  • Environmental Chemistry
  • Geochemistry

Background:

  • Iron (hydr)oxides and humic acid (HA) are key soil components influencing nutrient cycling.
  • Understanding phosphate adsorption on iron (hydr)oxides is crucial for soil fertility and preventing eutrophication.

Purpose of the Study:

  • To investigate the impact of HA on phosphate adsorption and complexation on micro- and nano-sized goethite.
  • To elucidate the mechanisms governing phosphate-goethite interactions in the presence of HA.

Main Methods:

  • Synthesis of micro- (M-Goe) and nano-sized goethite (N-Goe).
  • Phosphate adsorption experiments under varying HA concentrations and conditions.
  • Surface complexation modeling using Charge Distribution-Multisite Surface Complexation (CD-MUSIC) and Natural Organic Matter-Charge Distribution (NOM-CD).
Keywords:
ATR-FTIRCD-MUSICHumic acid (HA)Iron (hydr)oxides

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Main Results:

  • Phosphate adsorption capacity on goethite decreased significantly with increasing HA concentration (up to ~45%).
  • Increased equilibrium phosphate concentration reduced HA adsorption on goethite.
  • CD-MUSIC and NOM-CD modeling identified dominant phosphate complexes (FeOPO2OH, (FeO)2PO2, (FeO)2POOH) with affinity constants (logKP).
  • Humic acid presence minimally altered phosphate coordination modes and affinity constants on goethite.

Conclusions:

  • Humic acid significantly influences phosphate adsorption but not the fundamental complexation mechanisms on goethite.
  • The findings enhance understanding of interfacial phosphate reactivity at the goethite-water interface.
  • This research aids in predicting the environmental fate of phosphate in soils and sediments.
NOM-CD model
Phosphate adsorption