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- Title
Cyanobacterial availability of phosphorus adsorbed onto iron/aluminum (hydr)oxides and its dependence on phosphorus desorption: from particulate sources to pH regulation.
- Authors
Chen, Yihan; Pei, Yu; Yi, Qitao; Zhang, Jin; Jia, Qirui; Ding, Yuxing; Cui, Hongbiao
- Abstract
Purpose: The three objectives are as follows: (1) to characterize phosphorus (P) adsorption/desorption with a series of representative iron/aluminum (Fe/Al) (hydr)oxides; (2) to assess the cyanobacterial availability of P adsorbed onto Fe/Al (hydr)oxides; and (3) to correlate the cyanobacterial availability of P to its adsorption/desorption onto Fe/Al (hydr)oxides and pH and discuss the related ecological implication. Materials and methods: Using five representative minerals (ferrihydrite, goethite, hematite, bayerite, and corundum), we conducted P isothermal adsorption onto Fe/Al (hydr)oxides with pH changing from 6 to 10. The cyanobacterial availability of P adsorbed onto Fe/Al (hydr)oxides (0.2 mg P g−1) was assessed by using a bioassay method with two cyanobacteria species, Microcystis aeruginosa and Dolichospermum flos-aquae, as test organisms. The 0.1 M NaOH was used to desorb P from Fe/Al (hydr)oxides that adsorbed P with different saturation degree during isothermal adsorption, to compare P desorption and its cyanobacterial availability. Results and discussion: This research verified that P adsorbed onto Fe/Al (hydr)oxides (P@Fe/Al (hydr)oxides) is a direct P source for cyanobacteria, which is available to cyanobacterial cells through desorption from mineral particles by pH regulation. The cyanobacterial availability of P@Fe/Al (hydr)oxides was dependent on mineral desorption, showing the following order: ferrihydrite < goethite < bayerite < corundum < hematite. The cyanobacterial availability of P, at an absorption amount of 0.2 mg P per gram of mineral, ranged from 66.1 to 99.4% and from 58.7 to 85.1% as assessed by Microcystis aeruginosa and Dolichospermum flos-aquae, respectively. With increasing adsorption saturation, the availability of P@Fe (hydr)oxides increased, while the availability of P@Al (hydr)oxides decreased. Conclusion: This research clarifies the relationship between the cyanobacterial availability of P and its adsorption/desorption on/from Fe/Al minerals, providing deeper insight into the ecological function of Fe/Al (hydr)oxides in water bodies. This research implies that we can characterize the buffering function of sediments/suspended particles contained Fe/Al (hydr)oxides by an adsorption–desorption equilibrium with pH regulation, greatly simplifying the complex problems in natural water bodies.
- Subjects
DESORPTION; GOETHITE; MICROCYSTIS aeruginosa; OXIDES; ALUMINUM; BODIES of water; IRON; PHOSPHORUS in water
- Publication
Journal of Soils & Sediments: Protection, Risk Assessment, & Remediation, 2024, Vol 24, Issue 1, p425
- ISSN
1439-0108
- Publication type
Article
- DOI
10.1007/s11368-023-03612-w