Platinum-gold

Table 2.1 ranks materials by their cost per unit weight UK per tonne (i.e. 1000 kg) in the second column, US per tonne in the third. The most expensive materials - diamond, platinum, gold - are at the top. The cheapest - cast iron, wood, cement - are at the bottom. Such data are obviously important in choosing a material. How do we keep informed about materials prices change and what controls them ... 

Fluorinated polymers stand out sharply against other construction materials for their excellent corrosion resistance and high-temperature stability. In this respect they are not only superior to other plastics but also to platinum, gold, glass, enamel and special alloys. The fluorinated plastics used in process plants are polytetrafluorethylene (PTFE), fluorinated ethylene/ propylene (FEP), polytrifiuoromonochlorethylene (PTFCE) and polyvinyl fluoride (PVF). They are much more expensive than other polymers and so are only economical in special situations [59]. 

It yields salts with the usual alkaloidal reagents, such as platinum, gold, and mercuric chlorides. Its constitution is—... 

Cesium Barium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury Thallium Lead Bismuth FJonhun Astatine Radon... 

A glass surface to be silvered by a ing-on process should be cleaned with soap and water or detergents. For metallizing with platinum, gold and palladiiun, improved results are sometimes obtained with glass which has been stored when, after cleaning, it is immersed in 5 per cent acetic acid (cold) for six hours. The special preparation is then applied. If necessary it is mixed before use with a suitable thinner. The preparation is allowed to dry this may be accelerated by warm air. Dust should not be allowed to settle on the surface before firing. 

THE FIRING ON OF METAL LAYERS ON GLASS Platinum, Gold and Palladium... 

Although the Ag- -Ag interactions are not very strong, there are many examples of complexes, which contain Ag-,M contacts. Silver forms very stable heteropolynuclear complexes with different structural motifs, among them it is worth mentioning the species where silver interacts with platinum, gold, iron, mercury, etc. 

Minigrids of platinum, gold, silver, etc. can comprise several hundred... 

D.T. Sawyer and J.L. Roberts, Electrochemistry of oxygen and superoxide ion in dimethyl sulfoxide at platinum, gold, and mercury electrodes. J. Electroanal. Chem. 12, 90-101 (1966). 

Kuroda and Tarui [498] developed a spectrophotometric method for molybdenum based on the fact that MoVI catalyses the reduction of ferric iron by divalent tin ions. The plot of initial reaction rate constant versus molybdenum concentration is rectilinear in the range 0.01-0.3 mg/1 molybdenum. Several elements interfere, namely, titanium, rhenium, palladium, platinum, gold, arsenic, selenium, and tellurium. 

Martin, R.B., in Lippard, S.J. (ed.), Platinum, Gold and Other Metal Chemotherapeutic Agents, ACS Symposium Series 209, American Chemical Society, Washington DC, 1983, p. 231. 

Materials that are appropriate with respect to 2, 3 and 4 are gold, platinum, gold-mercury amalgam, silver and carbon. 

Platinum Gold Mercury Thallium Lead Bismuth Polonium Astatine Radon... 

A metallic electrode consisting of a pure metal in contact with an analyte solution develops an electric potential in response to a redox reaction occurring at its metal surface. Common metal electrodes such as platinum, gold, palladium or carbon are known as inert metal electrodes whose sole function is to transfer electrons to or from species in solution. Metal electrodes corresponding to the first kind are pure metal electrodes such as Ag, Hg and others that respond directly to a change in activity of the metal cation in the solution. For example, for the reaction... 

If a stationary electrode is used, such as platinum, gold, or glassy carbon, the technique is called voltammetry. One useful voltammetric technique is called stripping voltammetry, in which the product of a reduction is deposited on the surface on purpose and then stripped off by an oxidizing potential— a potential at which the oxidation of the previously deposited material occurs. This technique can also use a mercury electrode, but one that is held stationary. 

Such material must be insoluble in the flux. Examples are platinum, gold, nickel, and porcelain. 

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