Fe-containing particles

Fe-containing particles. Actually, it was found that many Fe-containing particles contain carbon, however, these particles were classihed as Fe-containing. Here, the particles classihed as carbonaceous are mostly composed of carbon, nitrogen, and oxygen without iron. These carbonaceous particles might be from outdoor sources, since it is well known that anthropogenic carbonaceous particles are one of the major chemical species in urban atmosphere. 

Fe-containing particles encountered in the Hyehwa station samples are mainly oxidized iron, although some iron metal partieles are also encountered. Fe-con-taining subway particles might be produeed from the frietion at rail-wheel-brake interface. It is likely that wear and friction processes on the rail initially produce the iron metal flakes, and yet the active iron surface can easily react with oxygen. 

AR - as-rolled mill finished sheet containing stuface oxides and Fe-containing contaminants from the rolling mill (ii) FIT - heat-treated in air at 450 °C for 10 min (which did not remove the surface embedded Fe-containing particles) (iii) FTT -I- sandblast - heat-treated and sandblasted with glass beads to remove surface oxide and produce a shiny surface (which did not remove the surface embedded Fe-containing particles but produced a more uniform distribution of... 

Figures 3.27 and 3.28 show that the as-rolled sheet had a high corrosion rate attributed to the Fe-containing particles in the surface from the rolling process. Heat treatment led to a slight increase in corrosion rate. Sandblasting led to a further increase in corrosion rate consistent with Fe-particle pick-up during sandblasting. Both acid cleaning and grinding effectively removed the surface contaminants and dramatically improved the corrosion resistance.

Song et al. [76] measured the mass loss rate in 3.5% NaCl for HP Mg as cast and after being subjected to a number of equal channel angular pressings (ECAP). They found that the corrosion rate increased with number of ECAP passes. Based on the work of Song and Xu [75], the increase in corrosion rate with ECAP passes observed by Song et al. [76] is consistent with surface pick-up of Fe-containing particles in each ECAP pass. 

Al—Fe. The Al—Fe system (Fig. 10), is important because virtually all commercial aluminum alloys contain some iron [7439-89-6] Fe. The system has a eutectic at 1.9% Fe, but soHd solubiHty of only 0.05% Fe. Consider an alloy containing 0.3% Fe. During solidification, most of the Fe remains ia the Hquid phase until a eutectic of soHd solution plus Al Fe constituent particles free2es. Alternatively, constituents of the metastable Al Fe phase [12005-28-6]... 

More than 20 Si-containing particles are seen to exist within the 25 pm2 area shown. Ca, Fe and Si were found to be the most abundant components in single particles. 

A comparison of different mineral acids for wet digestion of plant material for AAS analysis was carried out by Dokiya et al. (1975), who concluded that nitric acid was best for the determination of Cu, Mn and Pb by flameless AAS, whereas a nitric sulphuric mixture was best for Fe, Mn, Cu and Zn by FAAS. Most literature reports dissolve plant material in nitric acid (Middleton and Stuckey, 1954) or in nitric and perchloric acids (Isaac and Johnson, 1975 Williams, 1978, Thompson and Wood, 1982). This method will not dissolve aluminium containing particles from soil or other contaminations (Pierson and Evenson, 1988 Ramsey et al., 1991) (see also Standard Reference Materials). 

Figure 17 Backscattered electron images of three chondrules in Tieschitz (H/L3.6) chondrite. (a) Type lA porphyritic chondrule composed largely of forsteritic olivine (ol), mesostasis (mes), metallic Fe,Ni droplets (white). Dusty olivines are relict, FeO-rich olivines that crystallized elsewhere and formed tiny metallic Fe,Ni particles when heated in the chondrule melt, (b) Type IIA porphyritic chondrule containing large euhedral, FeO-bearing, olivine phenocrysts, dark mesostasis (mes), and white sulfide droplets (sf). (c) Nonporphyritic chondrule containing fine pyroxene crystals that appear to radiate from the upper edge of the chondrule.

Determine the efficiency and pressure drop (AP) based on cyclone dimensions and the gas flow rate at 516.7 ftVs. and a density of 0.075 Ib/ft containing particles with density of 62.43 Ib/fE. 

Halbach and Puteanus (1984) showed that the dissolution of calcareous tests in the water column plays a key role in the incorporation of Fe into these crasts. The calcareous tests contain about 500 ppm Fe. The flux of Fe to the surface of the crasts derived from the release of colloidal Fe oxyhydroxide particles on dissolution of the calcareous tests was estimated to be about 15 ag cm a which is almost equivalent to the flux of Fe in the concretions of 22.4 - 44.8 ag cm a. The rate of incorporation of Fe into the crasts is therefore related to the position of the ly socline. Based on such considerations, these authors concluded that the metal supply from the water column to the crasts... 

The phases identified by means of XRD, eleetron diffraction and Mossbauer spectrometry are summarized in Table 1. Irradiated films appear amorphous in XRD, but the broad features observed in the diagrams are centered at the same angles than the mean peaks of a-Fe and Ni in samples containing larger crystallites. Moreover, the precipitation of Fe, Ni particles with mean diameters and standard deviations of 4 1 nm (Ni) and 4 2.5 nm (Fe) is elearly evidenced by means of TEM (Fig. 1). A broader distribution of sizes ranging from 5 to 20 nm is observed in a TH.Ni film annealed at 1000°C (the mean radius found from a set of 500 particles was smaller than the standard deviation). In addition, images of the annealed film show that the matrix is very porous. Annealed samples containing Fe have not yet been observed. 

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