Abstract
The cardiovascular drugs (CDDs), such as metoprolol (MET), atenolol (ATE), bezafibrate (BZB), and atorvastatin (ATO), have been frequently detected in the water environment. They can cause potential threats to the ecological environment and human health due to their “pseudo-persistence” effect. In this study, the photolysis kinetics, degradation mechanisms, by-products, influencing factors, and acute toxicity of these four typical CDDs under polychromatic ultraviolet irradiation (200–400 nm) were investigated. The results showed that the photolysis of ATE, BZB, MET, and ATO all followed pseudo-first-order kinetics, and their average photon quantum yields of the wavelength studied were 0.14×10−2, 0.33×10−3, 0.78×10−4, and 0.24×10−4 mol einstein−1, respectively. Singlet oxygen (1O2), hydroxyl radical (·OH), and the triplet-excited state of the cardiovascular drug (3CDD*) were all involved in the photolysis while 1O2 was the dominator. The effects of NO3−, Cl−, HCO3−, and humic acid (HA) on the photolysis were the combination of light-shielding, quenching, and excitation of reactive species. Seven, four, four, and nine photolysis products of ATO, BZB, ATE, and MET were identified, respectively, and their possible degradation pathways were proposed. The acute toxicity of ATE was basically unchanged during photolysis; however, ATO, BZB, and MET toxicity all increased due to the generation of ketonization and hydroxylation products.
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This work was supported by the National Natural Science Foundation of China (Grant No. 41877466), Natural Science Foundation of Guangdong Province (Grant No. 2019A1515011037), Research Fund of SIT of Guangzhou (Grant No. 201707010158).
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Senwen **: Experimental operation, data analysis, writing—original draft preparation; Wenting Lin: Literature retrieval, data curation; Anchen Liu: Product identification; Zhihan Gao: Experimental operation; Han Lin: Experimental operation; Yuan Ren: Conceptualization, writing—reviewing and editing, supervision.
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**, S., Lin, W., Liu, A. et al. Ultraviolet photolysis of four typical cardiovascular drugs: mechanisms, influencing factors, degradation pathways, and toxicity trends. Environ Sci Pollut Res 28, 60663–60675 (2021). https://doi.org/10.1007/s11356-021-15000-3
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DOI: https://doi.org/10.1007/s11356-021-15000-3