AI Article Synopsis
- Anthropogenic activities have increased phosphorus (P) levels in sediments across various water bodies, with redox potential (Eh) influencing P's movement between sediments and water.
- This study examines how changes in Eh affect P release from sediments in the Weiyuan River, Honghu Lake, and Bao'enqiao Reservoir, using reactor experiments and the SEDEX method for P analysis.
- Findings reveal that within an Eh range of -300 mV to +230 mV, higher P release occurs, especially in reservoir sediments, posing a significant risk of eutrophication as the enrichment potential coefficient (EPC) of sediments increases dramatically.
Article Abstract
Anthropogenic activities have significantly enriched P in sediments of many water bodies, with redox potential (Eh) being a key factor in controlling P adsorption or release.This study evaluates the impact of Eh on P release from sediments in the Weiyuan River, Honghu Lake, and Bao'enqiao Reservoir using reactor experiments. P speciation was further analyzed through SEDEX method. Results show that within an Eh range of -300 mV to +230 mV, more P is released from sediments into the water column. The P fractions CDB-P and Fe(II)-P exhibit the most significant changes, especially in reservoir sediments where ΔCDB-P (85.5 mg/kg) and ΔFe(II)-P (80.6 mg/kg) are the highest among the three water bodies, followed by lake sediments. Additionally, after redox oscillation, the EPC of lake and reservoir sediments increased to 16.2 and 18.8 times their initial values, respectively, significantly raising the risk of eutrophication.
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| http://dx.doi.org/10.1016/j.marpolbul.2024.116909 | DOI Listing |
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