Properties antimony concentration

At site A in Table 16, concentrations of all metals in the second soil-core depth were higher than those in the first soil-core depth. Bismuth and antimony concentrations in the soil core under the second core depth were less than those of natural concentrations, 0.34 and 0.37 /rgg , respectively. At sites B and C, the profiles of metal concentrations were somewhat different from those in site A The difference is probably due to dissimilarities in pollution history, surrounding circumstances and properties of soil. 

Properties of the Vermilion of Antimony.—The vermilion of antimony is in the state of a very fine powder, without taste or smell, and is insoluble in water, alcohol, or essential oils. It is but little acted upon by the weak acids, even when concentrated, or by the powerful inorganic acids which have been diluted with water. It stands the latter acids better than the ordinary sulphide of antimony. Concentrated and hot hydrochloric acid dissolves it, with formation of sulphuretted hydrogen and chloride of antimony. Nitric acid oxidises it, with the production of sulphuric and antimonic acids. The vermilion of antimony is not sensibly acted upon by ammonia or the alkaline carbonates on the other hand, the powerful caustic alkalies, such as potash, soda, baryta, strontia, and lime, decompose it and form combinations which are colourless, or nearly so. The colour is therefore destroyed consequently this pigment should not be mixed with alkaline substances. A high temperature blackens it, and should the heat be such as to melt it, it becomes ordinary svilphide of antimony. 

Properties of Antimony(V) Oxide. Put a little antimony(V) oxide into two test tubes and test its reaction with a 10% sodium hydroxide solution and with concentrated hydrochloric acid. What do you... 

The use of polyols such as pentaerythritol, mannitol, or sorbitol as classical char formers in intumescent formulations for thermoplastics is associated with migration and water solubility problems. Moreover, these additives are often not compatible with the polymeric matrix and the mechanical properties of the formulations are then very poor. Those problems can be solved (at least partially) by the synthesis of additives that concentrate the three intumescent FR elements in one material, as suggested by the pioneering work of Halpern.29 b-MAP (4) (melamine salt of 3,9-dihydroxy-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5]-undecane-3,9-dioxide) and Melabis (5) (melamine salt of bis(l-oxo-2,6,7-trioxa-l-phosphabicyclo[2.2.2]octan-4-ylmethanol)phosphate) were synthesized from pentaerythritol (2), melamine (3), and phosphoryl trichloride (1) (Figure 6.4). They were found to be more effective to fire retard PP than standard halogen-antimony FR. 

These solutions are thus less acidic than those of antimony pentafluoride because the H2F+ concentration is lower. PF6 appears to behave as a non-electrolyte and it must be concluded that it is too weak a fluoride ion acceptor to enhance the acid properties of hydrogen fluoride (Dean et al., 1970). The strong proton acid HS03F exhibits no appreciable acid properties in HF (Gillespie and Humphreys, 1970). 

Typical concentration range general range - 20-50 wt% with some fillers mechanical properties decrease even at low loadings (10%) calcium carbonate - 10-60 wt%, kaolin - 20-40 wt% talc - 20-40 wt% glass beads - 20-50 vol% " carbon black - 10-30 wt% glass fiber - 1-60 01% ° magnesium hydroxide - 60-65 wt% (for V-0 classification) antimony trioxide - 10 wt% (for V-0 classification)... 

Manufacturers of various fillers continue studies on altemative systems. Most antimony oxide used as a fire retardant can be replaced by a combination of zinc borate without the loss of other properties (in some cases improvements are reported). Another option is to use the same filler systems which are used in polyethylene insulated cables and wires. These are based on magnesium hydroxide and aluminum hydroxide. These systems pcrfoim as flame retardants but require a high filler concentration which affects jacket resistance and mechanical performance. Recently, new coated grades have been developed which can be used at up to 65 wt% without the loss of properties or productivity (extrusion rates 2,500 m/min of cable are possible). ... 

It seems, therefore, that the recent characterization of the phase compensation and structural properties of tin-antimony oxides may readily be correlated with the Mossbauer determination of cationic oxidation states and lattice distortion, especially in materials containing a high concentration of antimony. The charge compensation mechanism, however, remains an intriguing aspect of this material and the nonlocalization of electron density may well be considered as a feature of potential catalytic relevance. In this respect a technique which is well suited to the study of the dependence of catalytic performance on the presence of any spin free species and semiconducting properties is ESR. 

To aid chemical uses, the separation of urushiol on cation exchange resins has been employed (ref. 320). Recent work has concentrated on the preparation of various salts from Al, Sb (ref.321), Ti (IV), Fe(ll) and Cu(ll) (ref. 322). Aluminium compounds possessed good thermal stability, antimony compounds flame-retardant properties and titanium componds excellent anticorrosion action. 2 1 Complexes... 

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