Particle size characterization as a support for sediment contamination analysis

2017 ◽  
Vol 28 (4) ◽  
pp. 462-476 ◽  
Author(s):  
Felippe Fernandes ◽  
Cristiano Poleto
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Metropolitan Region ◽  
Size Analysis ◽  
Content Type ◽  
Fine Sediments ◽  
Water Courses ◽  
Different Depths ◽  
Particle Size Characterization ◽  
Different Characteristics

Purpose The purpose of this paper is to analyse the results of particle size profiles carried out in the dam Mãe d’água, located in the metropolitan region of Porto Alegre, Rio Grande do Sul, becoming a tool of support for geochemistry evaluation works of sediments in this basin. Design/methodology/approach The methodology comprised the particle size analysis of eight cores sampled using the extraction profile technique “Sampling Cores.” A total of 56 sub-samples were obtained at different depths, varying between 0 and 52 cm. The particle size analysis of the sub-samples was carried out with the protocol relating to Brazilian analysis standards NBR 7,181; for determination of the particle size distribution of thick sediments, the sieve method was used, and for fine sediments, the pipette method was used. Findings The results show that for the different depths, the sediment profiles show similarity in their sedimentary deposition layers. Cores T1, T6, T7 and T8 showed a classification with predominance of mud. Cores T2 and T5 showed variations throughout their sedimentary profile, varying of mud predominance to sand with gravel, and on cores T3 and T4, the predominant characteristic is sand with mud and sand with gravel, respectively. Originality/value It can be seen in this paper that energy of sedimentological flow reaches it in a different way, creating these three sectors (first, sand with gravel; second, sand with mud and third, mud) with different characteristics – morphodynamic and sedimentological. These characteristics are important for the study of the heavy metals on the soil and therefore for reducing the risk of contamination of water courses.

Particle Size Analysis of Fe3O4 Nanoparticles Coated by Polyethyleneglycol

2015 ◽  
Vol 820 ◽  
pp. 373-377 ◽  
Author(s):  
Fernanda A. Sampaio da Silva ◽  
Edwin E.G. Rojas ◽  
Marcos Flávio de Campos
Keyword(s):  
Particle Size ◽  
Average Diameter ◽  
Rietveld Analysis ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Cancer Treatments ◽  
Peg 4000 ◽  
Size Characterization ◽  
Particle Size Characterization

Nanotechnology has been shown as an important tool for developing intelligent devices. In particular, magnetic nanoparticles have been studied due their applications in cancer treatments. However, nanoparticles need to be tightly controlled in relation to size, shape and coating. It makes particles suitable for in vivo applications. In this work, magnetite nanoparticles were used for particle size characterization. Fe3O4 crystals were coated by polyethyleneglycol (PEG 4000). Three different techniques were performed to obtain the nanoparticles average diameter: Rietveld Analysis, Scherrer Equation and Nanosight®. Results indicate good properties.

Development and preparation of oxide mixture-based pigments for anticorrosion paints

2017 ◽  
Vol 46 (5) ◽  
pp. 342-355 ◽  
Author(s):  
Petr Benda ◽  
Andréa Kalendová
Keyword(s):  
Particle Size ◽  
Mechanical Tests ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Coating Materials ◽  
Pigment Volume Concentration ◽  
Oxide Mixture ◽  
Content Type ◽  
Steel Panels ◽  
Lamellar Zinc

Purpose The aim of the work is to develop an anticorrosion pigment based on an oxide mixture with lamellar particles. The pigments are prepared from lamellar zinc, zinc oxide and magnetite by calcination. An alkaline earth carbonate is added when embedding a third cation in the lattice of the ferrite that forms the envelope of the lamellar zinc. The properties of the pigments are tested both in the powdered state and when embedded in an epoxy-ester system using different pigment volume concentrations (PVC). Design/methodology/approach The properties of paints containing synthesised oxide mixture-based pigments at various volume concentrations and with the Q factor – Q = PVC/CPVC = 0.65 – were examined (where CPVC is critical pigment volume concentration). A series of isometric ferrite pigments were also synthesised for a comparison. Paints of both types with PVC = 10, 15 and 20 per cent were formulated. Steel panels coated with the paints were subjected to corrosion and mechanical tests. Findings The oxide mixtures with lamellar particles were subjected to particle size analysis and found to make up a broad distribution curve. Electron microscopy photographs confirmed that the oxide mixture pigments contained lamellar particles with a surface layer. A high anticorrosion effect was achieved owing to the combination of different oxide types. Research limitations/implications The properties of the oxide mixtures with lamellar particles are described. Their particle distribution curves can be obtained by particle size analysis methods with a view to obtaining additional information on the status and properties of the pigment particles that may be useful in the development of better paints/coating materials. Practical implications Oxide mixtures with lamellar particles can be used in paints protecting construction steel. Originality/value The composition of the prepared oxide mixture-based pigments is novel. Each oxide acts by its own anticorrosion mechanism and the final beneficial effect is due to their concerted action.

Research on Utilizing Environmental Friendly Materials of Barrier Board for Particle Reduction of High-Turbidity Raw Water

2012 ◽  
Vol 602-604 ◽  
pp. 1124-1129
Author(s):  
Jian Liang Chen ◽  
Yi Kuo Chang ◽  
Yun Hwei Shen ◽  
Kun Liao Chen ◽  
Wun Jiun Guo
Keyword(s):  
Particle Size ◽  
Initial Period ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Raw Water ◽  
Effluent Water ◽  
Catchment Basin ◽  
High Turbidity ◽  
Different Depths ◽  
Pre Treatment

Due to the difficulty of conserving the water and soil of the hillside land in the catchment basin Area, it tends to produce high-turbidity raw water during the initial period of typhoons or storms and affect the operation of the Purifying System. In this Research, the raw water presenting varied turbidity levels was sampled from different depths under the water surface to simulate the change of the water quality. During the research, a Barrier Board was used to extend the flowing route and the level change of the overflow; further, varied flow rates were also employed to carry out the pre-treatment of high-turbidity raw water in order to study the changes of particle size of the influent and effluent water. In respect to Particle Size Analysis, the Particle Size (D98) of the High-turbidity Raw Water was roughly between 100~125μm; after the pre-treatment with the Barrier Board, the Particle Size at ＜D10 was between 0.73~2.13μm. With the increase of accumulated particle size percentage, the effluent water was able to reach <25μm at D98 of Particle Size under the low rate (8ml/s), the effluent water D98 was able to reach <10μm, which is an outstanding removal effect. In view of this, a certain degree of effect could be achieved by treating the High-turbidity Raw Water before it settles.

Study of Processing Techniques for Nepheline Syenitic Raw Material Exploitation

2014 ◽  
Vol 92 ◽  
pp. 215-220
Author(s):  
Carolina del Roveri ◽  
Letícia H. Godoy ◽  
Antenor Zanardo ◽  
Luciano L. Silva ◽  
Maria Margarita T. Moreno ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Separation ◽  
Optical Microscope ◽  
Particle Size Analysis ◽  
Raw Material ◽  
Size Analysis ◽  
Before And After ◽  
Size Characterization ◽  
Particle Size Characterization ◽  
Processing Techniques

Lavrinhas, a city located 234 km northeast of São Paulo, Brazil, presents syenitic rocks with high content of nepheline, whose preliminary field assessment indicated its potential to be used in the production of ceramic products. The paper aimed to study this raw material with fluxing properties and to determine the best processing methods based on mineralogy and texture, in order to achieve better removal efficiency of the nepheline. Petrographic characterization was carried out in two rock samples, as well as the particle size characterization of the untreated material, the split into fractions for magnetic separation tests and optical microscope observation of the products. In addition, chemical and particle size analysis and melting tests were performed. The latter concerned the material melting color evaluation before and after the magnetic separation, as well as its potential use in glazes and engobes, compared to a standard sample of Nepheline, and inferences for the use in porcelain masses. Preliminary tests showed that after the removal of residual iron oxide, the nepheline raw material bearer has potential to be used in the formulation of porcelain masses, replacing other fluxing materials with higher benefit.

APSAS; an Automated Particle Size Analysis System

Circular ◽  
1985 ◽  
Author(s):  
Lawrence J. Poppe ◽  
A.H. Eliason ◽  
J.J. Fredericks
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Analysis System
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