Role of size of magnetite nanoparticles for trifluralin detoxication in water and soil
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RASTIMEŞINA, Inna, POSTOLAKY, О., JOSAN (VORONA), Valentina, STREAPAN, Nina, MAMALIGA, Vera, GUTSUL, Tatiana, DRAGALIN, Ion. Role of size of magnetite nanoparticles for trifluralin detoxication in water and soil. In: Microbial Biotechnology, 12-13 octombrie 2016, Chișinău. Chișinău, Republica Moldova: Institutul de Microbiologie şi Biotehnologie, 2016, Ediția 3, p. 170.
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Microbial Biotechnology
Ediția 3, 2016
Conferința "Microbial Biotechnology"
Chișinău, Moldova, 12-13 octombrie 2016

Role of size of magnetite nanoparticles for trifluralin detoxication in water and soil


Pag. 170-170

Rastimeşina Inna1, Postolaky О.1, Josan (Vorona) Valentina1, Streapan Nina1, Mamaliga Vera1, Gutsul Tatiana2, Dragalin Ion3
 
1 Institute of Microbiology and Biotechnology of the ASM,
2 Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu" of the Academy of Sciences of Moldova,
3 Institute of Chemistry of the Academy of Sciences of Moldova
 
Disponibil în IBN: 15 martie 2019



Teza

Recently, zero-valent iron (Fe0) and magnetic iron oxide or magnetite (Fe3O4) nanoparticles are offered as a treatment option for reductive dechlorination of the chlorinated organic pollutants. Due to their large surface and high chemical activity, iron-based nanoparticles are significantly superior to the commonly used methods for the degradation of pollutants. Applications of commercial iron-based nanoparticles have been reported for soil and groundwater treatment. Properties of nanoparticles largely depend on their shape and size, method of their nucleation, type of their stabilizing shell and purification rate of the nanoparticles. Trifluralin is a synthetic fluorinated dinitroaniline herbicide, which is used in the control of annual grasses and broad-leaved weeds in agriculture, horticulture, viticulture, amenity and home gardens. It is currently widely registered for use throughout the world, although the use within the EU was banned from 2008, and in Moldova – from 2012. The aim of this study was to examine the effect of the magnetite nanoparticles on trifluralin degradation in soil and water, using analytical method and biotesting. Magnetite nanoparticles were prepared according to the chemical co-precipitation method using iron (II) sulfate and iron (III) chloride in the presence of poly-N-vinylpyrrolidone (PVP). PVP was used as a polymeric stabilizer for the formation of magnetite nanoparticles. The size of Fe3O4/PVP nanoparticles was 17–20, 20–25, and 50–70 nm. In aqueous system, trifluralin dissolved in acetone was mixed with Fe3O4/PVP nanoparticles powder (NP1) and Fe3O4/PVP nanoparticles aqueous colloidal solution (NP2), in concentration of 200 mg/l. After 14 days of treatment trifluralin remains 1.52% and 3.51% from initial concentration of 0.15 mM, when used NP1 and NP2 correspondingly. Trifluralin can exert a phytotoxic action on some cereals, such as wheat, oats, rice, and corn. The effect of magnetite nanoparticles on the germination capacity of seeds under the toxic action of trifluralin was studied. The test-object was seeds of wheat Triticum aestivum L. The test response was the length of the roots and shoots of the wheat. Fe3O4/PVP nanoparticles aqueous colloidal solution was used for treatment of long-term trifluralin contaminated soil for 4 days. Trifluralin residue amounts 30 mg/kg dry soil. The introduction of aqueous colloidal solution of Fe3O4/PVP nanoparticles (size 17–20 and 20–25 nm) into the contaminated soil and incubation for 4 days had a positive effect on the growth of the test plants: the root length increased by 79% and 87%, and the shoot length increased by 49% and 76%, respectively. The maximal effectiveness Fe3O4/PVP nanoparticles had at the concentration of 50 mg/kg of dry soil. Fe3O4/PVP nanoparticles size 50–70 nm had a negative effect on the length of the roots and shoots of the wheat.