Toxicity of titanium dioxide nanoparticles on Pseudomonas putida

Water Research
R G CombarrosM Díaz

Abstract

The increasing use of engineered nanoparticles (NPs) in industrial and household applications will very likely lead to the release of such materials into the environment. As wastewater treatment plants (WWTPs) are usually the last barrier before the water is discharged into the environment, it is important to understand the effects of these materials in the biotreatment processes, since the results in the literature are usually contradictory. We proposed the use of flow cytometry (FC) technology to obtain conclusive results. Aqueous solutions of TiO2 nanoparticles (0-2 mg mL(-1)) were used to check its toxicity effect using Pseudomonas putida as simplified model of real sludge over room light. Physiological changes in P. putida from viable to viable but non-culturable cells were observed by flow cytometry in presence of TiO2. The damaged and dead cell concentrations were below 5% in all cases under study. Both FSC and SSC parameter increased with TiO2 dose dependent manner, indicating nanoparticles uptake by the bacteria. The biological removal of salicylic acid (SA) was also significantly impacted by the presence of TiO2 in the medium reducing the efficiency. The use of FC allows also to develop and fit segregated kinetic mode...Continue Reading

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Citations

Aug 24, 2016·Frontiers in Microbiology·Lucie LéonardNadia Oulahal
Sep 30, 2017·Chemical Society Reviews·Rasel DasSeeram Ramakrishna
Oct 11, 2017·Environmental Science and Pollution Research International·Biplab SarkarSurajit Bhattacharjee
Dec 29, 2020·The Science of the Total Environment·Wei YuanRuifei Wang
Dec 16, 2020·Comprehensive Reviews in Food Science and Food Safety·Kai DongXiaojun Liao
Mar 22, 2021·Journal of Environmental Sciences (China)·Hongyan SunDongsheng Wang
Dec 30, 2018·Water Research·Hannah R Safford, Heather N Bischel
Apr 27, 2021·Water, Air, and Soil Pollution·Paula de Freitas Rosa RemiroMônica Lopes Aguiar
Jul 24, 2018·Journal of Agricultural and Food Chemistry·Gauri A Achari, Meenal Kowshik

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