부산대학교 도서관

Abstract The pharmaceutical valsartan is classified as a trace organic compound and is released into wastewater from human consumption. Trace organic compounds are not completely removed during conventional wastewater treatment. In order to prevent their release into the aquatic environment, advanced wastewater treatment technologies such as ozonation are currently implemented. Ozonation leads to the formation of transformation products (TPs), which then enter the receiving waters. In the present work, laboratory-scale ozonation experiments of valsartan solutions were performed. The resulting TPs were analyzed by HPLC-MS and searched for using a non-targeted approach. Of the 51 compounds detected, 27 have tentative structural suggestions based on MS/MS experiments. Ozonation of valsartan does not lead to the formation of TPs with higher toxicity towards A. fischeri than the parent compound. According to QSAR-based environmental behavior estimations, most TPs reveal lower lipophilicity, increased biodegradability as well as decreased acute and chronic toxicities concerning fish, daphnia and algae compared to their parent compound valsartan. Graphical abstract Image 1 Highlights • TPs of valsartan during ozonation were identified for the first time. • Structural elucidation of numerous TPs was performed. • Reactions with OH radicals were identified as main degradation pathways. • Acute and chronic tests with luminescent bacteria showed no effects. • Lipophilicity, biodegradability and ecotoxicity of TPs were estimated via QSAR models. [ABSTRACT FROM AUTHOR]