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Daily cycle of variability contents of phosphorus forms in surface microlayer of a light salinity Baltic Sea Lagoon lake (North Poland) - Part II

100%
Antonowicz J.
Open Chemistry
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2013
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vol. 11
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issue 5
817-826
EN
A daily cycle of tests was conducted to specify the concentration variation of phosphorous compounds and other chemical parameters at surface microlayers of a shallow lagoon lake located on the Baltic Coast. The water for analyses was collected from Lake Dołgie Wielkie in one hour cycles for the period of 24 hours. Samples were collected from the surface microlayers that had a thickness of 80–115 µm and 250–300 µm as well as from the subsurface water at the depth of 15 cm. Data analysis shows information concerning the migration of phosphorous compounds between the analyzed layers. Correlations were estimated for the obtained concentrations of phosphorous compounds and the nitrogen compounds and other physico-chemical values which were described in the first part of the cycle. The content of nutrients in the examined surface water layers correlated with the oxygen consumption due to the value of the oxygen consumption mostly depending on the concentration of organic matter.
2
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Corrosion properties of Zn-Ni-P alloys in neutral model medium

88%
Bachvarov V., Peshova M., Vitkova S., Boshkov N.
Open Chemistry
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2014
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vol. 12
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issue 11
1183-1193
EN
The presented work reports on the peculiarities of the anodic behavior, corrosion resistance and protective ability of electrodeposited Zn-Ni-P alloys with a different composition in a model corrosion medium of 5% NaCl. Three characteristic coating types have been investigated using experimental methods such as potentiodynamic polarization (PD) technique and polarization resistance (Rp) measurements. In addition, X-ray diffraction (XRD) analysis as well as scanning electron microscopy (SEM) coupled with an Energy-dispersive X-ray (EDAX) device were applied to determine the differences in the chemical composition and surface morphology which appeared as a result of the corrosion treatment. The data obtained are compared to those of electrodeposited pure Zn coatings with identical experimental conditions demonstrating the enhanced protective characteristics of the ternary alloys during the test period in the model medium. The influence of the chemical and phase composition of the alloys on its corrosion resistance and protective ability is also commented and discussed.
3
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The Ti-Fe-P system: phase equilibria and crystal structure of phases

88%
Toma O., Dzevenko M., Oliynyk A., Lomnytska Y.
Open Chemistry
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2013
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vol. 11
|
issue 9
1518-1526
EN
Abstract Phase equilibria was investigated in the Ti-Fe-P system at T = 1070 K in the region 0–67 at.% of P, employing X-ray powder diffraction. The two ternary compounds, namely Ti0.5–0.8Fe1.5−1.2P (Co2Si-type; space group Pnma; a = 0.5964(2)–0.6011(3), b = 0.3575(3)–0.3600(1), c = 0.6828(2)–0.6882(2) nm) and Ti0.85−1.25Fe1.15−0.75P (ZrNiAl-type; space group P-62m; a = 0.6071(4)–0.6117(1), c = 0.3510(9)–0.3506(1) nm) exist in the Ti-Fe-P system at this temperature. The crystal structure of the Ti0.85–1.25Fe1.15−0.75P compound was additionally determined by X-ray single crystal diffraction on the phase with stoichiometric composition. The substitutions of Ti by Fe were observed for Ti5P3.16, Ti3P and TiP phases, and Fe for Ti in the case of Fe3P, Fe2P binary compounds. Graphical abstract [...]
4
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Developing of Automatic Fertilizer Control System in Soybean Plant Based on Internet of Things and LoRa Networks

63%
Perdana D., Panca Kusuma W. R., Alinursafa I., Perdana D., Panca Kusuma W. R., Alinursafa I.
International Journal of Electronics and Telecommunications
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2021
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vol. 67
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issue 4
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