Metal specifity

AWS) has issued specifications covering the various filler-metal systems and processes (2), eg, AWS A5.28 which appHes to low alloy steel filler metals for gas-shielded arc welding. A typical specification covers classification of relevant filler metals, chemical composition, mechanical properties, testing procedures, and matters related to manufacture, eg, packaging, identification, and dimensional tolerances. New specifications are issued occasionally, in addition to ca 30 estabUshed specifications. Filler-metal specifications are also issued by the ASME and the Department of Defense (DOD). These specifications are usually similar to the AWS specification, but should be specifically consulted where they apply. 

Metal cation CAS Registry Number Formula % Metal Specific gravity, g/cm 1992 price, /kg... 

This shift in emphasis by the mining iadustry has led to the development and use of a variety of improved techniques, in particular the commercial avadabihty of several metal specific extractants. These techniques are particularly useful in the separations and recycling of metals from metal sludges and metal salt solutions. 

The limit of 1 ppm mercury placed on colors intended for use in foods was estabUshed by a letter from the Acting Director of the Division of Colors and Cosmetics to the certified color manufacturers in 1970. This action was the first step taken to replace the somewhat nebulous heavy metals specifications previously used with concrete limits for specific metals. 

Porcelain enamels meet a variety of performance characteristics required for different appHcations. The common characteristics of all enamels include good adherence to the substrate and good thermal expansion fit to the metal. Specific properties depend on usage for example, acid and alkaH resistance, hot water resistance, abrasion resistance, thermal shock resistance, high gloss, high reflectance, specific color, heat resistance, and cleanabihty. 

Galvanic corrosion is location specific in the sense that it occurs at a bimetallic couple (Fig. 16.2). It is metal specific in the sense that, typically, corrosion affects the metal that has less resistance in the environment to which the couple is exposed. Hence, in principle, we would anticipate galvanic corrosion of relatively reactive metals wherever they are in physical contact with relatively noble metals in a sufficiently aggressive, common environment. Experience has shown, however, that all such couples do not necessarily result in unsatisfactory service. This is because of the interplay of various critical factors that influence galvanic corrosion. These critical factors are discussed in the next section. 

Blech, n. plate, sheet, sheet metal, specif, slieet iron foil (weisses) tin plate (schwarzes) black iron plate, -aussetmitt, -ausstoss, m (Metal.) blank, -biichse, /. tin can, tin. -dose, /. tin box tin can, tin. -eisen, n. sheet iron. 

Graumetalli n. gray metal, specif, gray pewter. 

Other transition metals have received much less attention. Complexes of palladium and 2-amino-phenyl-containing formazans have been reported.397 Mercury complexes of tridentate formazans have been studied.398 Silver complexes of tridentate benzothiazolyl-containing formazans have also been studied.399 Recently, alkali and alkaline earth metals have been the subject of many studies. Formazans such as 228 and 229 as well as the macrocyclic 204 have received considerable attention as metal-specific analytical reagents.400-41 1... 

This chapter also deals in particular with chromatographic detection by atomic plasma spectrometry and plasma mass spectrometry (AED, MIP, ICP). With the application of such detectors, metal-specific signals can be obtained - thus the information content of a separation increases significantly. The major objectives of interfaced chromatography-atomic plasma source emission spectrometry (C-APES) are ... 

The alchemists of the Middle Ages were no strangers to acids. In fact, aqua fortis, which literally means "strong water," is basically nitric acid. Alchemists used aqua fortis to dissolve certain metals. Specifically, they used it to separate silver (which would dissolve in aqua fortis) from gold (which would not). 

F. Yamakura, K. Kobayashi, H. Ue, and M. Konno, The pH-dependent changes of the enzymic activity and spectroscopic properties of iron-substituted manganese superoxide dismutase. A study on the metal-specific activity of Mn-containing superoxide dismutase. Eur. J. Biochem. 227, 700—706 (1995). 

Sauer, G.R. and N. Watabe. 1989a. Temporal and metal-specific patterns in the accumulation of heavy metals by the scales of Fundulus heteroclitus. Aquat. Toxicol. 14 233-248. 

For a single microorganism with a given ro, different metals may have remarkably different behaviour, due to the metal-specific association and dissociation kinetics of the complexes involved. Take, for example, an organism of... 

The secret that makes this process work is no surprise, the catalyst. Those that work include some of the noble metals, specifically, platinum or palladium, a rare earth metal like cerium or neodynium (are they rare or what ) on alumina, or a non-noble metal like chromium on a silica-aluminum support. 

Tensile testing or a hardness test is a basic requirement of most metal specifications. Some product specifications also require impact-testing, bend and other ductility tests, proof testing, flange or flare tests. The size of the sample may limit which tests can be performed. Macro, superficial, and micro-hardness tests are routinely done in failure analysis even if the original product specification did not require them. 

It was also observed, in 1973, that the fast reduction of Cu ions by solvated electrons in liquid ammonia did not yield the metal and that, instead, molecular hydrogen was evolved [11]. These results were explained by assigning to the quasi-atomic state of the nascent metal, specific thermodynamical properties distinct from those of the bulk metal, which is stable under the same conditions. This concept implied that, as soon as formed, atoms and small clusters of a metal, even a noble metal, may exhibit much stronger reducing properties than the bulk metal, and may be spontaneously corroded by the solvent with simultaneous hydrogen evolution. It also implied that for a given metal the thermodynamics depended on the particle nuclearity (number of atoms reduced per particle), and it therefore provided a rationalized interpretation of other previous data [7,9,10]. Furthermore, experiments on the photoionization of silver atoms in solution demonstrated that their ionization potential was much lower than that of the bulk metal [12]. Moreover, it was shown that the redox potential of isolated silver atoms in water must... 

For non-magnetic actinide metals, specific heat data have been employed very usefully to corroborate 5 f localization starting with Am, as indicated by the sudden drop in y values (ypu 12 mJ/mol K, yAm 2 mJ/mol K ). It allowed also the discovery of superconductivity in Pa and Am metals ... 

Landweber, L. F. and Pokrovskaya, I. D. (1999). Emergence of a dual-catalytic RNA with metal-specific cleavage and ligase activities the spandrels of RNA evolution. Proc. Natl. Acad. Sci., 96, 173-8. 

The metal ion specificity for the reaction with acetate was different from that in the reaction with phosphate in the former beryllium was most active, followed by nickel. The alkaline earths that were so effective with phosphate did not catalyze the reaction with acetate at all. The difference in metal specificity in the two reactions was explained by assuming that complexation with the orthophosphate and acetate constitutes an important function in the reaction. 

Metal specific ion-exchange resins bearing hydroxyoxime groups have been prepared [10] from substituted phenylacrylates (Fig. 6). 

Once again, further single-crystal VEELS and RAIRS work would be very advantageous for the ethyl group on other metals, specifically Ni. LEED evidence for the presence of regular arrays would enable reliable symmetry assignments to be made, and PED work could probably distinguish between on-top and threefold hollow sites. 

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