Oxidation of the antibacterial agent norfloxacin during sodium hypochlorite disinfection of marine culture water

Chemosphere
Yuanyuan ZhangKefu Yu

Abstract

Chlorination disinfection and antibiotic addition are two universal processes of marine culture. The generation of disinfection byproducts (DBPs) is unavoidable. Antibiotic residue not only pollutes water but also acts as a precursor to the production of new DBPs. The fate of antibiotic norfloxacin (NOR) in chlorination disinfection was investigated. It was observed that NOR could be oxidized by disinfection agent sodium hypochlorite, but the oxidation rate varied considerably with the type of disinfected water. For fresh water, marine culture water and sea water, the reaction rate constant was 0.066 min(-1), 0.466 min(-1) and 1.241 min(-1), respectively. The difference was primarily attributed to the promotion role of bromide ions in seawater and marine culture water. Moreover, the bromide ions could result in the generation of brominated DBPs (Br-DBPs). The kinetics, products, reaction centers and mechanisms were investigated. The active site of NOR was found to be the N4 atom on piperazinyl in fresh water. During marine culture water and sea water disinfection, the carboxyl on NOR was oxidized and two Br-DBPs were formed. This was attributed to the lowering of the reaction's required activation energy when performed in the p...Continue Reading

Citations

Jun 25, 2020·Environmental Science and Pollution Research International·Rhuana Valdetário MédiceMarcelo Libânio
Feb 2, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Shengkai XuBensheng Su
Jul 30, 2021·Luminescence : the Journal of Biological and Chemical Luminescence·Małgorzata KaczmarekMikołaj Stodolny

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