Indirect photodegradation of sulfisoxazole: Effects of environmental factors (CDOM, pH, salinity, HCO3−, metal ions, halogen ions and NO3−). (January 2022)

• Record Type: Journal Article
• Authors: Duan, Jiaqi; Jian, Huimin; Dou, Qiwei; Shi, Xiaoyong; Su, Rongguo
• Is Part Of: Marine pollution bulletin. Volume 174(2022)
• Publication Date: 2022-01
• Subjects: Sulfisoxazole -- Indirect photodegradation -- Chromophoric dissolved organic matter -- Reactive intermediates; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2022.113320
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: It's a new perspective to explore the influences of chromophoric dissolved organic matter (CDOM) components and environmental factors on the removal of sulfisoxazole (SIX) from the water matrix. Reactive intermediates (RIs) trapping experiments demonstrated that excited triplet-state CDOM ( 3 CDOM ⁎ ) played a dominant promoting role (54.11%) in the CDOM-mediated SIX indirect photodegradation. Additionally, terrestrial humic-like (C1, C3 and C4) and marine humic-like (C2) fluorescent components were identified by parallel factor (PARAFAC) analysis of CDOM excitation-emission matrix spectroscopy (EEMs). C1 and C4 were significantly correlated (R 2 > 0.91) with the SIX degradation rate owing to their higher productivity of RIs and a greater contribution to the production of 3 CDOM ⁎ compared to others. Salinity, pH and HCO3 − were conducive to the SIX indirect photodegradation, while metal ions (Fe 3+ and Cu 2+ ), halogen ions (Cl − and Br − ) and NO3 − were opposite. These findings are essential for understanding the environmental fate of SIX in coastal waters. Graphical abstract: Unlabelled Image Highlights: The SIX removal was controlled by the CDOM exogenous components (C1 and C4). OH, 1 O2 and 3 CDOM ⁎ played a key role in the indirect photodegradation of SIX. The 3 CDOM ⁎ contribution rate to the SIX indirect photodegradation was up to 54.11%. Salinity, pH and HCO3 − were favorable to the indirect photodegradation of SIX.