Affiliation:
1. State Key Laboratory of Organic Geochemistry, Guangdong‐Hong Kong‐Macao Joint Laboratory for Environmental Pollution and Control, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China
2. CAS Center for Excellence in Deep Earth Science Guangzhou China
3. University of Chinese Academy of Sciences Beijing China
Abstract
AbstractA laboratory experiment is conducted to investigate the effects of organic carbon (OC) from riverine and marine sediments on the degradation of ring‐14C‐labeled nonylphenol (14C‐NP) by hydrogen peroxide (H2O2). Researchers have isolated demineralized OC (DM) before and after oxidation, namely, DM and resistant OC (ROC) fractions, respectively. The structures of DM and ROC are characterized using solid‐state 13C nuclear magnetic resonance. Unstable structures (O‐alkyl, OCH3/NCH, and COO/NC=O) show a significant and positive correlation with the degradation of 14C‐NP (R2 > 0.73, p < 0.05), thus suggesting that the NP absorbed in the unstable structures is easily degraded because of the decomposition of unstable components. The stable structures (alkyl C and non‐protonated aromatic C [Arom C─C]) exhibit a significant and negative correlation with the degradation of 14C‐NP (R2 > 0.69, p < 0.05), thus suggesting that the NP absorbed and protected in these resistant structures is minimally degraded. The significant correlations among the degradation kinetic parameters (Frap and Fslow), OC structures (Falip and Farom), and microporosity further illustrate the important protective roles of OC structures and micropores in the degradation of 14C‐NP by H2O2 (R2 > 0.69, p < 0.05). The parent NP fraction that desorbed into the aqueous solution or extracted is completely degraded, indicating preferential degradation of the easily desorbed NP. This study provides important insights into the NP degradation mechanism in sediment–water systems, particularly regarding sediment OC structures and microporosity.
Funder
National Natural Science Foundation of China
Subject
Management, Monitoring, Policy and Law,Pollution,Waste Management and Disposal,Water Science and Technology,Environmental Engineering