Platinum elemental composition

Elemental composition (anhydrous salt) Pt 47.60%, H 0.49%, Cl 51.90%. The compound may be identified by its physical and chemical properties. Platinum in an aqueous solution of the compound can be analyzed by flame AA or ICP spectroscopy. Also, the compound can be measured by gravimetry following precipitation with ammonium chloride, hydrogen sulfide, or silver nitrate (see Reactions above). 

Elemental composition Pt 73.36%, Cl 26.64%. The compound is dissolved in concentrated HCl, diluted, and analyzed for platinum by flame-AA spectrophotometry (see Platinum). The salt may be identified by its ohve green color and other physical and x-ray properties. It forms a dark brown color in HCl. 

Elemental composition Pt 85.91%, O 14.09%. The oxide may be characterized by its physical properties and by x-ray diffraction. The compound may be thermally decomposed at elevated temperatures or reduced by hydrogen to form platinum metal which may be digested with aqua regia and HCl, diluted, and analyzed by flame AA, ICP/AES or ICP/MS. 

Elemental composition Pt 92.41%, 0 7.59%. The oxide can be identified by its physical and x-ray properties. Additionally, platinum may be measured by flame-AA following digestion of the solid with aqua regia and HCl (see Platinum). 

Elemental composition Pt 52.56%, Cl 47.44%. Platinum tetrachloride may be dissolved in water and analyzed for platinum (see Platinum). Also, it may be identified by its physical properties and certain precipitation reactions after dissolving in HCl (see Platinic Acid, Hexachloro). 

Thus, for example, the compound whose elemental composition corresponded to the formula PtN2HsCl2 was not the molecular compound Pt(NH4 C1)2,C12, but rather had the ammonia (NH ) molecules and the chlorine atoms bound directly to the platinum atom. There were two isomeric forms of this substance, and Werner proposed that the formula should be planar, producing the two isomers ... 

The literature averages recorded in Table I are representative values Table I. Percent Elemental Composition of Colombian Alluvial Platinum... 

In the preparation of iridium-containing catalysts, the temperature of calcination in air is critical. Mossbauer spectra at 25°C are shown in Figure 4.34 for platinum, iridium, and bimetallic platinum-iridium catalysts (samples B-600, C-600, and D-600, respectively) which were prepared by calcination in air at 600°C prior to the final reduction in hydrogen at 500°C. The catalysts have the same elemental compositions as the catalysts for which spectra are shown in Figure 4.32, but they exhibit structural differences due to the higher calcination temperature (600 vs. 260<>C) employed in their preparation. 

Contrary to expectation, the reaction product 8, a black amorphous powder soluble in water and acetic acid, was found to have composition and properties quite different from those expected for the platinum analog of the Pdsgi giant clus-ter.157] According to elemental analysis, substance 8 has the reproducible elemental composition Pt8phen3(0Ac)4(0H)4(H20)6, which is quite different from the expected minimum formula Pt9(phen)o.96(OAc)2.89 for the Pt analog of palladium giant cluster 6. On the basis of the elemental composition, the formal oxidation state of platinum in substance 8 is close to (+1). This value was confirmed by the EXAFS data. ... 

Energy dispersive X-ray spectroscopy (EDX) is used predominantly for elemental analysis or chemical characterization. The advantage of this technique is that it can identify the elemental composition for a small area thus, a profile of element composition can be created across the sample. Since EDX tests are usually conducted in a scanning electron microscope, a composition profile can be directly overlaid onto a secondary scanning electron microscope micrograph. Major elements related to membrane chemical degradation such as fluorine, sulfur, platinum and other metals can be readily detected. 

When humulone (or another alpha acid) is hydrogenated in acidic conditions, especially with palladium as catalyst, an alkenyl side chain is removed. To avoid this (rare example of) hydrogenolysis (see 3.3.) humulone is hydrogenated with platinum(IV) oxide in methanol at pH 5.1. 2-(3-Methylbutanoyl)-6-(3-methyl-2-butenyl)-4-(3-methylbutyl)-3,5,6-trihydroxycyclohexa-2,4-dienone or dihydrohumulone (18, Fig. 15) is isolated by counter-current distribution in the two-phase system benzene aqueous buffer pH 8.4 (15% triethanolamine, 25% ethylene glycol and 0.25 N HCI) (1). After 330 transfers 18 is found as a band with distribution coefficient of 1. It occurs as a light-yellow oil of elemental composition C21H32O0. 

Elemental isotopic compositions (isotope ratios) can be used mass spectrometrically in a routine sense to monitor a substance for the presence of different kinds of elements, as with chlorine or platinum. It can also be used in a precise sense to examine tiny variations in these ratios, from which important deductions can be made in a wide variety of disciplines. 

There are over 100 different platinum group minerals. Some of the most common PGM are shown in Table 18.1. The stoichiometry of most of the PGM named [1] is known, but because these minerals are subject to a wide range of element substitution, as indicated in Table 18.1, there is little consistency between an ideal formula for the individual minerals and compositions of the given minerals from various locations. 

The method used by Hutchinson (11) allows the measurement of the composition of soap films, the constituents of which are labelled with radioactive elements. Such a film may be formed by raising a platinum ring through the surface of the solution of the soap. The radiation emitted by the tagged molecules of the film is measured and the concentration of the last ones in the film are calculated. 

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