Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany; Centre for Water and Environmental Research (ZWU), University of Duisburg-Essen, Universitätsstr. 2, 45141 Essen, Germany.
Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany.
Sci Total Environ. 2022 Apr 1;815:152427. doi: 10.1016/j.scitotenv.2021.152427. Epub 2021 Dec 28.
Bromide as an omnipresent matrix component in wastewater can react with ozone to form hypobromous acid (HOBr). This secondary oxidant can subsequently react with micropollutants but also with formed intermediates. Therefore, bromide and especially HOBr can highly influence the formation of transformation products (TPs). This has already been reported for the ozonation of N,N-dimethylsulfamide leading to the formation of the cancerogenic N-nitrosodimethylamine only in bromide containing waters. In this study, the influence of different bromide and ozone concentrations on the formation of TPs during the ozonation of isoproturon (ISO), metoprolol (METO) and diclofenac (DCF) were investigated. Additionally, TPs were identified, which are formed in the direct reaction of the micropollutants with HOBr with and without subsequent ozonation. The results showed that even if the reactions of ozone with the substances should be favored bromide can highly influence the formation of TPs already at low concentrations. In summary, new TPs after the reaction with HOBr (and subsequent ozonation) could be postulated for ISO, METO and DCF. This underlines that the present water matrix can have a high influence on the formation of TPs and that these mechanisms need to be investigated further.
溴化物作为废水中普遍存在的基质成分，可以与臭氧反应生成次溴酸（HOBr）。这种次氧化剂随后可以与微量污染物反应，也可以与形成的中间产物反应。因此，溴化物，特别是 HOBr，可以高度影响转化产物（TPs）的形成。这已经在臭氧化 N，N-二甲基甲酰胺导致仅在含有溴化物的水中形成致癌的 N-亚硝基二甲胺的反应中得到了报道。在这项研究中，研究了不同溴化物和臭氧浓度对异丙隆（ISO）、美托洛尔（METO）和双氯芬酸（DCF）臭氧化过程中 TPs 形成的影响。此外，还鉴定了在没有后续臭氧化的情况下，HOBr 与微量污染物直接反应形成的 TPs。结果表明，即使臭氧与这些物质的反应应该更有利，但在低浓度下，溴化物仍能高度影响 TPs 的形成。总的来说，可以为 ISO、METO 和 DCF 假设与 HOBr（和随后的臭氧化）反应后的新 TPs。这强调了当前水基质对 TPs 形成的影响很大，需要进一步研究这些机制。
