Humic acids impact on bioactivity of iron ions and nanoparticles

Kovaleva, Y.V.; Bondarenko, L.; Uchanov, P.; Fedoseeva, E.V.; Terekhova, V.; Kydralieva, K.

Авторы: Kovaleva Y.V., Bondarenko L., Uchanov P., Fedoseeva E.V., Terekhova V., Kydralieva K.
Сборник: SETAC Europe 29th Annual Meeting. Abstract Book. 26–30 May 2019 I Helsinki, Finland
Тезисы
Год издания: 2019
Место издания: Helsinki, Finland
Первая страница: 145
Последняя страница: 146
Аннотация: http://helsinki.setac.org/wp-content/uploads/2019/05/SETAC-Helsinki-Abstract-Book-2019.pdf Humic acids impact on bioactivity of iron ions and nanoparticles Y.V. Kovaleva, L. Bondarenko, Moscow Aviation Institute; P. Uchanov, Institute of Ecology and Evolution RAS / Laboratory for soil ecological functions; E.V. Fedoseeva, Pirogov Russian National Research Medical University / Pediatric faculty; V. Terekhova, Lomonosov Moscow State University / Lab of Ecotoxicological Soil Analysis; K. Kydralieva, Moscow Aviation Institute At present the question still remains whether the toxicity of iron oxide nanoparticles (NPs) from the released ions or NPs itself arises. In this study, behaviors of Fe3O4-NPs and iron ions (Fe2+ and Fe3+) in the presence of humic acids (HA), an natural organic polyligand that easily coordinate to iron (II, III) ions and graft to NPs surfaces, were investigated in the aspects of their toxicity to Sinapis alba and Paramecium caudatum. The Fe(II, III)-humic complexes were prepared by reaction of weighed amounts of the HA and the iron source with HA:Fe ratio of 1:0.150 (w/w). Colloidal Fe3O4-NPs were synthesized by a chemical precipitation method in situ when the magnetic particles are grown within the HA matrix that provides steric stabilization of the colloidal system. Several treatments of the test cultures were made: a) control A – tap water without Fe and HA; b) control B − tap water with Fe (II) or/and Fe(III), c) control C − tap water with HA, d) five treatments with the following substances: Fe(II, III)-HA: Fe(II)-HA, Fe(III)-HA, Fe(II, III)-HA, Fe3O4-NPs and Fe3O4-NPs-HA. Endpoints (EC50) and threshold level (EC20) for samples with acute toxicity have been studied in test systems with S. alba and P. caudatum. According to toxicity decreasing for both test cultures the studied samples can be arranged in the following order: Fe(II), Fe(II, III) ≥ Fe(III) >HA >Fe3O4-NPs-HA >Fe(III)-HA >Fe(II)-HA ≥ Fe(II, III)-HA >>> Fe3O4-NPs. Fe(II) and/or Fe(III) ions and HA clearly demonstrated increased toxicity with respect to root length of S. alba seedlings and mortality of P. caudatum. Combination of Fe (II and/or III) with HA lead to mitigation of toxicity. The Fe3O4-NPs in some concentrations stimulated the survival of ciliates and the growth of higher plants. We suppose that the observed low toxicity for Fe3O4-NPs is due to the released metal ions into the supernatant. In case of the Fe3O4-NPs-HA treatment, the disperse system effect as a whole is affected. Interpreting the results was performed by a two-way ANOVA with interactions using XLSTAT Software, 2014. The treatment method (single HA, single NPs or their mixture) and the treatment concentration have a significant effect on acute toxicity samples. For both Fe3O4-NPs and Fe3O4-NPsHA the toxicity more largely depend on the treatment concentration. Acknowledgement. This research has been financed by the Russian Foundation for Basic Research (#18-33-01270/18) and Russian Sciance Foundation (#16-14- 00167)
Добавил в систему: Терехова Вера Александровна

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