scholarly journals Agriculture increases the bioavailability of silicon, a beneficial element for crop, in temperate soils

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Caubet ◽  
S. Cornu ◽  
N. P. A. Saby ◽  
J.-D. Meunier
Keyword(s):  
Statistical Analysis ◽  
Iron Oxide ◽  
Clay Minerals ◽  
Soil Parameters ◽  
Oxide Content ◽  
Iron Oxide Content ◽  
Beneficial Element ◽  
Weathering Processes ◽  
Wheat Cultivation ◽  
Temperate Soils

AbstractCrops may take benefits from silicon (Si) uptake in soil. Plant available Si (PAS) can be affected by natural weathering processes or by anthropogenic forces such as agriculture. The soil parameters that control the pool of PAS are still poorly documented, particularly in temperate climates. In this study, we documented PAS in France, based on statistical analysis of Si extracted by CaCl2 (SiCaCl2) and topsoil characteristics from an extensive dataset. We showed that cultivation increased SiCaCl2 for soils developed on sediments, that cover 73% of France. This increase is due to liming for non-carbonated soils on sediments that are slightly acidic to acidic when non-cultivated. The analysis performed on non-cultivated soils confirmed that SiCaCl2 increased with the < 2 µm fraction and pH but only for soils with a < 2 µm fraction ranging from 50 to 325 g kg−1. This increase may be explained by the < 2 µm fraction mineralogy, i.e. nature of the clay minerals and iron oxide content. Finally, we suggest that 4% of French soils used for wheat cultivation could be deficient in SiCaCl2.

Coloring effect of iron oxide content on ceramic glazes and their comparison with the similar waste containing materials

2021 ◽  
Author(s):  
Fatma Gol ◽  
Zeynep Gizem Saritas ◽  
Selin Cıbuk ◽  
Cigdem Ture ◽  
Emre Kacar ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxide Content ◽  
Iron Oxide Content

scholarly journals Polymer-encapsulation of iron oxide clusters using macroRAFT block copolymers as stabilizers: tuning of the particle morphology and surface functionalization

2020 ◽  
Vol 8 (22) ◽  
pp. 4917-4929 ◽  
Author(s):  
Thiago Rodrigues Guimarães ◽  
Muriel Lansalot ◽  
Elodie Bourgeat-Lami
Keyword(s):  
Iron Oxide ◽  
Block Copolymers ◽  
Surface Functionalization ◽  
Particle Morphology ◽  
Amphiphilic Block Copolymers ◽  
Oxide Content ◽  
Iron Oxide Content ◽  
Polymer Encapsulation ◽  
Magnetic Carriers ◽  
Surface Functionalizations

We report a versatile platform for the preparation of magnetic carriers stabilized by macroRAFT amphiphilic block copolymers, exhibiting encapsulated morphologies, high iron oxide content and tailored surface functionalizations.

scholarly journals Iron oxide/titania composites for radar absorbing material (RAM) applications

Cerâmica ◽  
2019 ◽  
Vol 65 (375) ◽  
pp. 470-476 ◽  
Author(s):  
A. Fisli ◽  
D. S. Winatapura ◽  
E. Sukirman ◽  
S. Mustofa ◽  
W. A. Adi ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Pore Volume ◽  
Weight Ratio ◽  
Total Pore Volume ◽  
Precipitation Method ◽  
Oxide Content ◽  
Iron Oxide Content ◽  
Radar Absorbing Material ◽  
Radar Signature ◽  
Absorbing Material

Abstract Iron oxide/titania composites were synthesized by precipitation method. Amount of iron oxide was varied in the composites. The single phase (anatase) was obtained for the weight ratio of 0-20% and three phases (anatase, magnetite and hematite) were found for the weight ratio of 30% and 40% of iron oxide. The crystallite size of titania decreased with increasing of iron oxide content. The specific surface area, total pore volume and BJH pore volume of the sample increased with increasing iron oxide content in the composite. The composites possessed mesoporous characteristic (6.5-9.6 nm in pore diameter) and exhibited ferromagnetic properties. The measurement of the microwave absorption showed that the 40Fe/Ti composite had the best reflection loss of -14 dB at a frequency of 10.9 GHz. This meant that the electromagnetic wave was absorbed 80% in that frequency. Thus, the developed material can be a promising microwave absorbing agent in radar signature reduction.

Determination of the iron oxide content in bauxite: comparing ICP-OES with UV–VIS and volumetric analysis

2020 ◽  
Vol 75 (1) ◽  
pp. 389-396
Author(s):  
Gordana Ostojić ◽  
Dragica Lazić ◽  
Saša Zeljković
Keyword(s):  
Iron Oxide ◽  
Volumetric Analysis ◽  
Oxide Content ◽  
Iron Oxide Content ◽  
Icp Oes

scholarly journals Magnetic properties of glasses with high iron oxide content

2001 ◽  
Vol 36 (7-8) ◽  
pp. 1513-1520 ◽  
Author(s):  
Maximina Romero-Perez ◽  
Jesús Ma. Rincón ◽  
Carlos J.R.González Oliver ◽  
Claudio D’Ovidio ◽  
Daniel Esparza
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Oxide Content ◽  
Iron Oxide Content ◽  
High Iron

Effect of Concentration of Iron Oxide on Crystallization Behavior in Leadless Iron Oxide Crystalline Glaze

2012 ◽  
Vol 554-556 ◽  
pp. 18-22
Author(s):  
Supakorn Silakate ◽  
Anucha Wannagon ◽  
Apinon Nuntiya
Keyword(s):  
Iron Oxide ◽  
Nepheline Syenite ◽  
Crystallization Behavior ◽  
Raw Materials ◽  
Average Particle Size ◽  
Average Particle ◽  
Oxide Content ◽  
Iron Oxide Content ◽  
X Ray Diffraction ◽  
X Ray

The objectives of this study were to prepare leadless crystalline glazes from iron oxide by using low temperature firing (1,100°C) and to study the effect of concentration of iron oxide on the phase composition of the glaze raw materials on phase transformation in leadless iron oxide crystalline glaze. The crystalline phases were investigated by using the DTA, X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The composition of the glaze raw materials compose of nepheline syenite, colemanite, pottery stone, bentonite, ZnO, Li2CO3, SiOSubscript text2 and 10, 15 and 20%(w/w) iron oxide (Fe2O3). The glaze raw materials were ground for homogeneous mixtures by ball milling for 24h. The average particle size of the mixture was 3.86 µm. The glaze bodies were carried to firing at 1,100°C at the heating rate of 2°C/min and soaking for 0.5h. Then, the glaze bodies were cooled at the cooling rate of 1°C/min and maintained at 1,080°C for 3h and then maintained at 980°C for 1h, respectively. From the experiment results, it was found that the crystallization temperatures (Tc) of franklinite (ZnFe2O4) and anorthite (CaAl2Si2O8) depend on the concentration of iron oxide content.

scholarly journals The chromite deposits of the Fiskenæsset region, West Greenland

1967 ◽  
Vol 12 ◽  
pp. 1-39
Author(s):  
M Ghisler ◽  
B.F Windley
Keyword(s):  
Iron Oxide ◽  
Total Iron ◽  
Oxide Content ◽  
Iron Oxide Content ◽  
X Ray ◽  
Average Value ◽  
Maximum Thickness ◽  
V2o5 Content ◽  
Cr2o3 Content ◽  
Almost All

The chromite deposits of the Fiskenæsset region occur in anorthosites, which together with intercalated pyribolites (hypersthene amphibolites) and subsidiary pyroxenites and peridotites occur in the gneisses as horizons belonging to a folded and metamorphosed stratiform complex which has a maximum thickness of 2 km. The chromite occurs in horizons which average 0.5 - 3 m in width, reaching a maximum of 20 m, and consist of alternating anorthosite and chromitite layers, usually between 0.5 and 10 cm wide. Chromite horizons occur in almost all of the anorthosite horizons in the region which have a minimum exposed length of 125 km. 175 X-ray fluorescence analyses show that the Cr2O3 content of the chromite varies between 26% and 36%, averaging 32.7%. The total iron oxide content varies between 28% and 42%, averaging 31. 8% (as FeO), with the result that the Cr:Fe ratio varies between 0.66 and 1.05, averaging 0.93. The chromite has a high V2O5 content varying from 0.2% to 0.5% with an average value of 0.3%. The chromite horizons occur along the shores of the fjords or only a few kilometres from the coast in easily accessible terrain that rarely exceeds 500 m in altitude. Fiskenæsset harbour is ice-free for the whole year.

scholarly journals Study On Beneficiation Of Silica Sand By Wet High-Intensity Magnetic Separators (WHIMS) And Reverse Flotation Technique For Glass Application: A Case Study From Sihanoukville, Cambodia

Warta Geologi ◽  
2020 ◽  
Vol 46 (3) ◽  
pp. 210-213
Author(s):  
R. Sochea ◽  
◽  
S. Somsak ◽  
A. Numprasanthai
Keyword(s):  
Iron Oxide ◽  
High Intensity ◽  
Chemical Characterization ◽  
Silica Content ◽  
Shaking Table ◽  
Silica Sand ◽  
Oxide Content ◽  
Iron Oxide Content ◽  
Reverse Flotation ◽  
Flotation Technique

White silica sand samples were collected from Steuong Hav district area. The samples were mixed and quartered to obtain a representative sample for physical and chemical characterization. Silica (SiO2) and iron oxide (Fe2O3) content were measured by X-ray fluorescence (XRF) analysis. The results showed silica and iron oxide content at 94.83 wt.% and 0.189 wt.% representatively. In this study, a shaking table, Wet High-Intensity Magnetic Separators (WHIMS), and reverse flotation technique was undertaken to remove mainly iron oxide. The collectors amine (named AOA) and petroleum supinate (named NANZA), pine oil as frother, and H2SO4 as depressant were used to optimize the froth performance. The iron oxide content was removed from 0.189wt.% to 0.062 wt.% and the silica content was upgraded from 94.83 wt.% to 98.6 wt.% after the process.

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