Abstract
Triclocarban (TCC) is an antibacterial agent found in pharmaceuticals and personal care products (PPCP). It is potentially bioaccumulative and an endocrine disruptor, being classified as a contaminant of emerging concern (CEC). In normal uses, approximately 96% of the used TCC can be washed down the drain going into the sewer system and eventually enter in the aquatic environment. UV photolysis can be used to photodegrade TCC and ecotoxicity assays could indicate the photodegradation efficiency, since the enormous structural diversity of photoproducts and their low concentrations do not always allow to identify and quantify them. In this work, the TCC was efficiently degraded by UVC direct photolysis and the ecotoxicity of the UV-treated mixtures was investigated. Bioassays indicates that Daphnia similis (48 h EC50 = 0.044 μM) was more sensitive to TCC than Pseudokirchneriella subcapitata (72 h IC50 = 1.01 μM). TCC and its photoproducts caused significant effects on Eisenia andrei biochemical responses (catalase and glutathione-S-transferase); 48 h was a critical exposure time, since GST reached the highest activity values. UVC reduced the TCC toxic effect after 120 min. Furthermore, TCC was photodegraded in domestic wastewater which was simultaneously disinfected for total coliform bacterial (TCB) (360 min) and Escherichia coli (60 min).
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Acknowledgements
This work was carried out with Ciência Sem Fronteiras Program support (CNPq Process No. 400429/2014-4). The authors thank the undergraduate students Ferreira, I.J. (CNPq Process No. 159925/2015-0) and Sales, S. (CNPq Process No. 117762/2015-6). Saggioro, E.M. thanks FAPERJ project (E-26/010.002117/2015) and Satyro, S. thanks CNPq (Process No. 150384/2015-7).
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Satyro, S., Saggioro, E.M., Veríssimo, F. et al. Triclocarban: UV photolysis, wastewater disinfection, and ecotoxicity assessment using molecular biomarkers. Environ Sci Pollut Res 24, 16077–16085 (2017). https://doi.org/10.1007/s11356-017-9165-4
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DOI: https://doi.org/10.1007/s11356-017-9165-4