Aqua regia composition

Komposition,/. composition Dyeing) tin composition (solution of tin in aqua regia) hard lead. 

Elemental composition Ga 69.24%, P 30.76%. Gallium phosphide may be characterized hy its physical and electronic properties. It may also he analyzed hy various x-ray methods. Gallium may he measured hy AA and ICP spectrophotometry following digestion with nitric acid or aqua regia and appropriate dilution (See Gallium). 

Elemental composition Au 77.56%, F 22.44%. Gold(lll) fluoride may be characterized by x-ray techniques. The concentration of gold may be determined by AA and other instrumental methods following digestion in aqua regia and appropriate dilution. 

Elemental composition Hf 84.80%, O 15.20%. Hafnium may be analyzed in aqueous solution following digestion with hydrofluoric acid-nitric acid, or with aqua regia. The dioxide may be characterized nondestructively by x-ray methods. 

Elemental composition Hf 70.14%, F 29.86%. The compound is digested with aqua regia, the acid extract diluted and analyzed for Hf by various instrumental methods (see Hafnium). The compound may be characterized nondestructively by x-ray methods. 

Elemental composition In 48.53% Sb 51.47%. The compound may be analysed by x-ray analysis. Also, both indium and antimony may be measured by AA or ICP spectrophotometry after digestion with aqua regia. The metals may be measured nondestructively by x-ray fluorescence technique. 

Elemental composition Hg 86.22%, S 13.78%. The compound may be identified from its physical properties and also by x-ray methods. The compound may be heated in a current of air and SO2 formed may be analyzed by GC-FID or GC-FPD. Mercury(II) sulfide may be digested with aqua regia, diluted appropriately, and analyzed for mercury metal by AA using cold vapor method or by ICP-AES (see Mercury). 

Elemental composition Mo 59.94%, S 40.06%. The compound or mineral molybdenite may be identified nondestructively by x-ray and from physical properties. Molybdenum content of the material may be determined by various instrumental techniques after digestion of the solid in concentrated HNO3 or aqua regia followed by appropriate dilution of acid extract (See Molybdenum.)... 

Elemental composition Ni 53.00%, C 21.69%, N 25.30%. The compound may be identified by x-ray and selective chemical reactions with cyanide ions. Nickel may be analyzed in an acidified aqueous solution after it is solubilized with concentrated nitric acid or aqua regia (See Nickel). 

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 Rh 49.17%, Cl 50.83%. Rhodium is analyzed in an aqueous solution (or after dissolving in water) by AA or other techniques. Insoluble chloride is extracted with aqua regia, diluted, and analyzed to determine the rhodium content using various instrumental techniques. The chloride may be decomposed at elevated temperatures and liberated chlorine identified by color and other physical properties. Chlorine may be measured quantitatively by dissolving in an acidified solution of potassium iodide and titrating liberated iodine with a standard solution of sodium thiosulfate, using starch indicator. 

Elemental composition Ag 57.45%, Br 42.55%. Silver bromide is digested with aqua regia, diluted and analyzed for silver by flame- or furnace-AA, or ICP-AES. The aqueous solution is appropriately diluted and analyzed for bromide by ion chromatography. 

Elemental composition Th 87.88%, 0 12.12%. The oxide may be identified by x-ray methods. Thorium dioxide may be analyzed by AA or ICP after digestion in aqua regia and appropriate dilution in water. 

Elemental composition Sn 78.77%, 0 21.23%. Tin(IV) oxide can be identified by physical properties and x-ray diffraction. Tin content may be determined by various instrumental techniques in an acid solution of the oxide (See Tin). The compound is solubilized by digestion with nitric acid or aqua regia and diluted appropriately. 

Elemental composition Ti 59.95%, O 40.05%. The oxide may be identified by its physical properties and by x-ray methods. Titanium content may be measured by AA or ICP. The compound is digested in nitric acid or aqua regia, solubdized, and diluted sufficiently for metal analysis. 

Elemental composition Ti 95.95%, H 4.04%. A measured amount of hydride is decomposed at about 450°C and the volume of liberated hydrogen is measured. The hydride is digested cautiously in aqua regia, diluted and analyzed for titanium. 

Elemental composition W 79.30%, 0 20.70%. Tungsten trioxide may be identified by its physical properties or by x-ray diffraction methods. The oxide is either digested in aqua regia or dissolved in caustic alkalies, diluted, and analyzed for tungsten metal (See Tungsten). 

Sympathetic Ink. Although die discovery of the cobalt sympathetic ink, which remains invisible until wanned, has often been attributed to Jean Hellot, who first made it known publicly, he was not the first person to prepare it. Hellot himself stated that a German artist of Stol-berg had shown him a reddish salt which, when exposed to heat, became blue. It had been prepared by dissolving Schneeberg cobalt in aqua regia (119). H. F. Teichmeyer of Jena was also familiar with this cobalt ink, perhaps even before Hellot made its composition public in 1737... 

Hydrochloro-Auric Acid. Treat gold with aqua regia. When the metal dissolves, add 1 ml of concentrated hydrochloric acid and evaporate the solution until crystals appear. What is the composition of the obtained substance Dissolve several crystals of the compound in water, add to one half of the solution several drops of a soluble cesium salt, and to the other half a 0.1 N potassium hydroxide solution. What forms Write the equations of the reactions. 

Book Ten deals with the making of the mineral acids used in assaying and in parting operations. Aqua valens is the term which Agricola employs indiscriminately for the acids or mixtures of acids, ignoring the terms aqua fortis or aqua regia then already introduced by previous writers. His description of the materials used for preparation would indicate that a considerable variety of strength and composition of these acids were in use. He describes ten recipes for the materials to be subjected to distillation in the furnace. 

While we have not yet carried out detailed kinetic measurements on the rate of photocorrosion, our impression is that the process is relatively insensitive to the specific composition of the strontium titanate. Trace element compositions, obtained by spark-source mass spectrometry, are presented in Table I for the four boules of n-SrTi03 from which electrodes have been cut. Photocorrosion has been observed in samples from all four boules. In all cases, the electrodes were cut to a thickness of 1-2 mm using a diamond saw, reduced under H2 at 800-1000 C for up to 16 hours, polished with a diamond paste cloth, and etched with either hot concentrated nitric acid or hot aqua regia. Ohmic contacts were then made with gallium-indium eutectic alloy, and a wire was attached using electrically conductive silver epoxy prior to mounting the electrode on a Pyrex support tube with either epoxy cement or heat-shrinkable Teflon tubing. 

Action of ammonia or ammonium salts on gold chloride, oxide or other salts under a wide variety of conditions gives explosive or fulminating gold [1], Of uncertain composition but containing Au—N bonds, this is a heat-, friction- and impact-sensitive explosive when dry, similar to the related mercury and silver compounds [2]. In an attempt to precipitate finely divided gold from its solution in aqua regia... 

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