Indirect photodegradation of sulfadiazine in the presence of DOM: Effects of DOM components and main seawater constituents. (1st January 2021)

• Record Type: Journal Article
• Authors: Bai, Ying; Zhou, Yanlei; Che, Xiaowei; Li, Conghe; Cui, Zhengguo; Su, Rongguo; Qu, Keming
• Is Part Of: Environmental pollution. Volume 268(2021)Part B
• Publication Date: 2021-01-01
• Subjects: Sulfadiazine -- Dissolved organic matter -- Indirect photodegradation -- Reactive intermediate -- Fluorescence components; Sulfadiazine (SD) -- Dissolved organic matter (DOM) -- Reactive intermediates (RIs) -- Reactive triplet states of DOM (3DOM∗) -- hydroxyl radical (HO·) -- singlet oxygen (1O2) -- Pharmaceuticals and personal care products (PPCPs) -- Sulfonamides (SAs) -- Excitation-emission matrix spectroscopy (EEMs) -- Parallel Factor analysis (PARAFAC) -- Support vector machine (SVM) -- Support vector regression (SVR) -- Deuterium oxide (D2O) -- Furfuryl alcohol (FFA) -- Terephthalic (TA) -- Isopropanol (IPA) -- 2-Hydroxyterephthalic (HOTA) -- Suwannee River humic acid (SRHA) -- Suwannee River fulvic acid (SRFA) -- Suwannee River natural organic matter (SRNOM) -- Probe compounds (PCs) -- 2, 4, 6-trimethylphenol (TMP) -- Radial basis kernel function (RBF) -- Genetic algorithm (GA) -- Specific UV absorbance (SUVA) -- Humification index (HIX) -- 4-carboxybenzophenone (CBBP); Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2020.115689
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The presence of pharmaceuticals and personal care products in coastal waters has caused concern over the past decade. Sulfadiazine (SD) is a very common antibiotic widely used as human and fishery medicine, and dissolved organic matter (DOM) plays a significant role in the indirect photodegradation of SD; however, the influence of DOM compositions on SD indirect photodegradation is poorly understood. The roles of reactive intermediates (RIs) in the indirect photolysis of SD were assessed in this study. The reactive triplet states of DOM ( 3 DOM∗) played a major role, whereas HO· and 1 O2 played insignificant roles. DOM was divided into four components using excitation-emission matrix spectroscopy combined with parallel factor analysis. The components included three allochthonous humic-like components and one autochthonous humic-like component. The allochthonous humic-like components contributed more to RIs generation and SD indirect photolysis than the autochthonous humic-like component. A significant relationship between the indirect photodegradation of SD and the decay of DOM fluorescent components was found (correlation coefficient, 0.99), and the different indirect photodegradation of SD in various DOM solutions might be ascribed to the different components of DOM. The indirect photolysis rate of SD first increased and then decreased with increasing pH. SD photolysis was enhanced by low salinity but remained stable at high salinity. The increased carbonate concentration inhibited SD photolysis, whereas nitrate showed almost no effect in this study. Graphical abstract: Image 1 Highlights: 3 DOM∗ played a major role in the indirect photodegradation of sulfadiazine (SD). The allochthonous humic-like components contributed more to SD indirect photolysis. The DOM components were significantly correlated with SD indirect photodegradation. Salinity, pH and carbonate influence SD indirect photolysis by affecting RIs. Abstract : The allochthonous humic-like components contributed more to SD indirect photolysis than the autochthonous humic-like component.