Phosphorus adsorption by sediment considering mineral composition and environmental factors

Xiaocui Li, Lei Huang, Hongwei Fang, Minghong Chen, Zhenghui Cui, Zhiyu Sun, Danny Reible

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Sediment, composed of a complex assemblage of minerals, controls the fate and behaviour of P in aqueous environments and affects trophic status. In this study, P adsorption was studied on minerals including quartz, hematite, potassium feldspar, montmorillonite, kaolin, and calcite (i.e., the main components of sediment) and sediment from the Guanting Reservoir. A general formula for P adsorption was proposed that considers mineral composition through the component additivity method, also incorporating the effects of environmental factors, including the aqueous P concentration (Ce), pH, sediment concentration (S), and ionic strength (IS). The P adsorption capacity gradually decreased with increasing particle size, and the contributions from kaolin and montmorillonite to P adsorption were significant despite representing only a small fraction of sediment (with a maximum amount of P adsorption of 0.92 and 0.36 mg/g, respectively). The content of quartz accounted for approximately 40–60% of sediment; however, its P adsorption capacity was only 0.13 mg/g. These minerals exhibited different adsorption characteristics due to their different surface morphologies and lattice structures. Multivariable regression analysis was used to show that the amount of P adsorption was strongly correlated with Ce, followed by S, IS, and pH.

Original languageEnglish
Pages (from-to)17495-17505
Number of pages11
JournalEnvironmental Science and Pollution Research
Volume28
Issue number14
DOIs
StatePublished - Apr 2021

Keywords

  • Adsorption capacity
  • Component additivity method
  • Environmental factors
  • Phosphorus
  • Sediment

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