Platinum, test for

The metal or alloy does not dissolve completely. The solution (A) is examined as in case 1. If the residue is black, it may be either carbon or gold and/or platinum. Test for carbon by igniting on a crucible lid carbon glows and burns. Gold and platinum dissolve in aqua regia (compare Sections VII.7 and VII.8). 

Hame tests fur Na (yellow) and K+ (violet). A drop of solution is picked up on a platinum loop and immersed in tire flame. The test for K+ is best done with a filter that hides the strong Na+ color. 

The platinized asbestos is filtered, washed once with 10% sulfuric acid, once with hot water, once with hot 5% hydrochloric acid, and finally with hot water until no test for chloride or sulfate is found. The product is dried at 110° and stored until needed in a covered container. Each gram of asbestos contains about 0.5 g. of platinum. 

Alloys of noble metals have been tested for O2 reduction [31] and some should even be more efficient than Pt [63]. These metals are expensive so that other materials have been tested, like bronze, some being even slightly better electrocatalysts than platinum [45] however, they do not seem to be stable enough. The factors governing oxygen reduction on oxides used as cathodes in fuel cells have been reviewed recently [92]. 

Other publications, which include "Interstate Commerce Commission Rules and Regulations for the Transportation of Explosives and Other Dangerous Articles , and ASTM (American Society for Testing and Materials) Dl209-69 publication, entitled "Standard Method of Test for Color of Clear Liquids (Platinum-Cobalt Scale) are listed in the same Spec... 

For comparative tests for determining the maximum yields of S03 with platinum, vanadium and other catalysts, see Neumann, Panzner and Goebel, Zeitsch. Elektrochem., 1928, 34, 696 Neumann and Goebel, ibid., p. 734 also Jaeger, oc. cit. 

Miscellaneous. Reduction of a palladium salt by CO is the basis of a visual test for ambient carbon monoxide (227). Palladium compounds are used as photographic sensitizers (228). The low dimensional mixed valence compound Csq 3[Pd(S2C2(CN)2)] 0.5H2O behaves as a semimetal at room temperature (229). Palladium compounds isostructural with potent platinum antitumor compounds have poor antitumor activity (230). 

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