Phosphorus can effectively reduce selenium adsorption in selenium-rich lateritic red soil
Jinlan Huang1, Xuejiao Huang1, Daihua Jiang1
1State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi University, Nanning 530004, Guangxi, China.
The Science of the Total Environment
|September 28, 2023
Summary
Adding phosphorus (P) reduces selenium (Se) adsorption in Se-rich soils. This occurs because P competes with Se for binding sites on soil minerals, impacting Se availability in agricultural products.
Area of Science:
- Soil Science
- Environmental Chemistry
- Agricultural Science
Background:
- Phosphorus (P) application enhances selenium (Se) availability in soil, boosting Se-rich crop yields.
- The precise mechanism of P's influence on Se adsorption in Se-rich soils remains largely uncharacterized.
Purpose of the Study:
- To investigate the adsorption behavior of P and Se in Se-rich lateritic red soil.
- To elucidate the interaction mechanism between P and Se adsorption in this soil type.
Main Methods:
- Batch adsorption experiments were conducted to study P and Se adsorption isotherms.
- Soil characterization techniques including SEM-EDS, FTIR, and XRD were employed.
- Langmuir and Freundlich models were used to describe adsorption processes.
Main Results:
- P and Se adsorption increased with equilibrium concentration in lateritic red soil.
- P addition significantly decreased Se adsorption from 276-423 mg/kg to 52-201 mg/kg.
- SEM-EDS, FTIR, and XRD revealed that P and Se compete for binding with ferrite groups, forming iron-containing complexes.
Conclusions:
- Competitive adsorption between P and Se, driven by complex formation with soil ferrite groups, is the primary reason for reduced Se adsorption.
- Findings provide theoretical insights into P's effect on Se biogeochemical cycling.
- This research supports the efficient utilization of Se-rich soil resources.
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