Abstract
This study was carried out to evaluate the contribution of different types of iron-organic matter associations (Fe-OM) to the phosphorus sorption capacity of peatland. Humic substance (HS) and particulate organic matter (POM) were isolated from peat soils, and different types of iron-organic matter associations (Fe-HS and Fe-POM) were prepared. Then, isothermal adsorption experiments were carried out on the synthesized Fe-OM and iron-contained peat soils. The morphology structure of Fe-HS associations is amorphous like that of ferrihydrite. The theoretical maximum adsorption capacity (Qmax) of Fe-HS associations can reach 36.90 mg/g, which is approximately two times higher than that of ferrihydrite (19.23 mg/g) and ten times higher than that of hematite (3.26 mg/g) and goethite (2.08 mg/g). Both peat soils and POM can strongly complex ferric ions, resulting in improved phosphorus sorption capacity. The Qmax of original peat soil and POM is 2.83 mg/g and 4.31 mg/g, which increased to 7.36 mg/g and 5.89 mg/g, respectively, after complexing ferric ions. Compared to inorganic Fe minerals, the associations of iron and organic matter (HS and POM) contribute more to the phosphorus retention ability of peat soils. However, the formation of Fe-OM associations could not fully explain why the addition of iron increases the phosphorus sorption capacity of peat soil by so much. Iron should also participate in other phosphorus retention processes, which need further exploration and research.
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This work was jointly supported by the National Natural Science Foundation of China (NSFC 41977263 and 41472316) and Open Project of Technology Innovation Center for Ecological Evaluation and Remediation of Agricultural Land in plain area, MNR (Grant No. ZJGCJ202002).
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Weilin Yang: conceptualization, methodology, analysis, writing—original draft. Wu **ang: conceptualization, resources, writing—review and editing. Ming Ma: synthesis of different materials. Chunlei Huang, **nzhe Lu, and Yong Wang: investigation. Lingyang Yao: analysis, investigation. Zhengyu Bao: supervision.
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Highlights
• The phosphorus sorption capacity of POM is stronger than that of peat soil, and both of them can be significantly enhanced after complexing ferric ions.
• Associations of iron and humic substances are kinds of two-line ferrihydrite, but the maximum theoretical amount of phosphate adsorbed is 91.9% higher than that of ferrihydrite.
• In addition to the formation of Fe-OM associations, iron also participate other mechanism that contribute to phosphorus retention capacity of peat soil.
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Yang, W., **ang, W., Bao, Z. et al. Phosphorus sorption capacity of various iron-organic matter associations in peat soils. Environ Sci Pollut Res 29, 77580–77592 (2022). https://doi.org/10.1007/s11356-022-21303-w
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DOI: https://doi.org/10.1007/s11356-022-21303-w