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Updated: Jan 12, 2026

Sediment Core Sectioning and Extraction of Pore Waters under Anoxic Conditions
Published on: March 7, 2016
Enhancement of persulfate/Fe2+ oxidation process by water-extractable organic matter in sediment
Cheolyong Kim1, Jae-Hyun Jo2, Inseong Hwang2
1Department of Civil and Environmental Engineering, Pusan National University, Busandaehak-ro 63beon-gil 2, Geumjeong-gu, Busan 46241, Republic of Korea; Department of Environmental Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea.
Abstract:
The role of water-extractable organic matter (WEOM), a naturally occurring fraction of sediment organic matter, in persulfate (S2O82-) activation by Fe2+ was investigated. Batch experiments using phenol as a model contaminant indicated that WEOM markedly improved the performance of the S2O82-/Fe2+ system by forming redox-active Fe-WEOM complexes rather than allowing Fe3+ to precipitate. Fluorescence spectroscopy indicated that the WEOM contained abundant algae-derived protein-like and microbially derived fractions that were distinct from terrestrially derived organic matter reference materials. Mechanistic investigations indicated that moderate Fe-WEOM complexation stabilized soluble iron species and also mitigated sulfate radical (SO4•-) scavenging by preventing excess contact between Fe2+ and S2O82-, and this increased the initial oxidation rate. Excessive complexation, however, caused steric hindrance that inhibited S2O82- activation by Fe2+. Electron donation by WEOM contributed only a little to persulfate activation. The results indicated that the redox and steric properties of WEOM affected the S2O82-/Fe2+ system and indicated the importance of considering the site-specific organic matter composition when using persulfate-based oxidation to remediate sediment.
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