Special Issue "Research Progress on Extraction and Characterization of Humus" - Separations (MDPI)Dear Colleagues, I am pleased to invite you to publish your new humus data in a Special Issue "Research Progress on Extraction and Characterization of Humus" - Separations (MDPI).

Humus is a stable natural product of the joint evolution of living and nonliving matter. It is formed as a result of repeated transformation of plant and animal remains in the presence of minerals under the influence of biological, climatic, and geological factors for a long time. Humus is not just a specific product of biological waste disposal, but also an important soil component. In particular, it acts as a stabilizer of the physical and chemical state of soils. Moreover, it acts as a source and regulator of the supply of nutrients to plants and soil organisms while also serving as their habitat.

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Special Issue "Research Progress on Extraction and Characterization of Humus" - Separations (MDPI)

Special Issue "Research Progress on Extraction and Characterization of Humus" - Separations (MDPI)

Research Progress on Extraction and Characterization of Humus

Dear Colleagues, I am pleased to invite you to publish your new humus data in a Special Issue "Research Progress on Extraction and Characterization of Humus" - Separations (MDPI).

Humus is a stable natural product of the joint evolution of living and nonliving matter. It is formed as a result of repeated transformation of plant and animal remains in the presence of minerals under the influence of biological, climatic, and geological factors for a long time. Humus is not just a specific product of biological waste disposal, but also an important soil component. In particular, it acts as a stabilizer of the physical and chemical state of soils. Moreover, it acts as a source and regulator of the supply of nutrients to plants and soil organisms while also serving as their habitat.

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Mono- and binuclear chloridecomplexes of bismuth (III) with 2-aminopyrimidine cations depending on specific synthetic route

Cover Mendeleev Communications March-April 2020 with stucture of complex Bi : 2-aminopyrimidine = 2 : 4 Mono- and binuclear chloridecomplexes of bismuth (III) with 2-aminopyrimidine cations depending on specific synthetic route. Trofimova T., Orlova M., Tafeenko V., Proshin A., Glazkova I., Pankratov D. //Mendeleev Communications. 2020. V.30. №2. P.202-204.

Complexes of BiIII with 2-aminopyrimidine cations with metal-to-ligand ratios of 1:3 or 2:4 (depending on reaction conditions) were synthesized and characterized by elemental analysis, 1H NMR spectroscopy, and single crystal X-ray crystallography. The possibility of conversion of the latter complex into the former one was demonstrated. The determined cytotoxicity depended on the structure of these complexes.

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Eco-Friendly Iron-Humic Nanofertilizers Synthesis for the Prevention of Iron Chlorosis in Soybean (Glycine max) Grown in Calcareous Soil

SAED of M sample: the selected area for the ED, and collected ED pattern with the integration result and XRD pattern of ferrihydrite in the inset; Mössbauer spectra of the M sample recorded at 295K.Eco-Friendly Iron-Humic Nanofertilizers Synthesis for the Prevention of Iron Chlorosis in Soybean (Glycine max) Grown in Calcareous Soil. Cieschi M.T., Polyakov A.Y., Lebedev V.A., Volkov D.S., Pankratov D.A., Veligzhanin A.A., Perminova I.V., Lucena J.J. //Frontiers in Plant Science. 2019. V.10. P.413.Search the full text below. Ищи полный текст ниже.Open access

Iron deficiency is a frequent problem for many crops, particularly in calcareous soils and iron humates are commonly applied in the Mediterranean basin in spite of their lesser efficiency than iron synthetic chelates. Development and application of new fertilizers using nanotechnology are one of the potentially effective options of enhancing the iron humates, according to the sustainable agriculture. Particle size, pH, and kinetics constrain the iron humate efficiency. Thus, it is relevant to understand the iron humate mechanism in the plant-soil system linking their particle size, characterization and iron distribution in plant and soil using 57Fe as a tracer tool. Three hybrid nanomaterials (F, S, and M) were synthesized as iron-humic nanofertilizers (57Fe-NFs) from leonardite potassium humate and 57Fe used in the form of 57Fe(NO3)3 or 57Fe2(SO4)3. They were characterized using Mossbauer spectroscopy, X-ray diffraction (XRD), extended X-ray absorption fine structure spectroscopy (EXAFS), transmission electron microscopy (TEM) and tested for iron availability in a calcareous soil pot experiment carried out under growth chamber conditions. Three doses (35, 75, and 150 mu mol pot-1) of each iron-humic material were applied to soybean iron deficient plants and their iron nutrition contributions were compared to 57FeEDDHA and leonardite potassium humate as control treatments. Ferrihydrite was detected as the main structure of all three 57Fe-NFs and the plants tested with iron-humic compounds exhibited continuous long-term statistically reproducible iron uptake and showed high shoot fresh weight. Moreover, the 57Fe from the humic nanofertilizers remained available in soil and was detected in soybean pods. The Fe-NFs offers a natural, low cost and environmental option to the traditional iron fertilization in calcareous soils.

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Nature-inspired synthesis of magnetic non-stoichiometric Fe3O4 nanoparticles by oxidative in situ method in a humic medium

Change of color of the solutions during synthesisNature-inspired synthesis of magnetic non-stoichiometric Fe3O4 nanoparticles by oxidative in situ method in a humic medium. Pankratov D.A., Anuchina M.M. //Materials Chemistry and Physics. 2019. V.231. P.216-224.

Magnetic iron oxide nanoparticles in humic substances shell - Fe3-δO4@HS were synthesized by oxidative in situ method in aqueous solutions of humic substances from metallic iron precursor. Humic substances interacting with metallic iron under natural conditions act as a complex reagent that participates in acid-base, redox, complexation reactions and adsorption processes. The Fe3-δO4@HS particles is the final product of corrosion of metallic iron in the presence of HS. Products were characterized by dynamic light scattering, scanning and transmission electron microscopy, X-ray powder diffraction, Mössbauer spectroscopy, magnetometry, infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and evolved gas analysis. It was demonstrated that the samples contained particles with sizes of 40–50 nm comprised of ∼24 nm magnetite-like crystalline cores coated by humic substances. The synthetic approach used in this article can be used as a model of corrosion processes of ferrous metals in nature. In addition, magnetite-like nanoparticulates stabilized with humic substances can be promising as bioavailable iron additives for agricultural applications.

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