Gas-chromic

KsCrClg, in an analogous manner and E. Fremy, found that when a mixture of potassium dichromate, mixed with charcoal, is heated in chlorine gas, chromic chloride sublimes, and the hexachloride remains. The salt is soluble in water, and at the same time is decomposed into its constituent chlorides. L. Godefroy said that the hexachloride is really a mixture of the pentachloride and potassium chloride. 

Gas-liquid Mist Acid mist carryover chromic acid oil mists tar fog... 

P. Kozak I. Bartosova, "Analytical Aspects of the. Oxidation of Organic Nitrogen Compounds With Chromic Acid. Gas Volume Determina-... 

Gas Gas-vapour Gas-liquid Gas-solid Gas-liquid-solid Mist Fume SO2 NOxI HCI CO hydrocarbons Acid mist carryover chromic acid oil mists tar fog Metal oxides, cement dust Paint spray... 

Bromine (dry gas) Bromine (liquid) Bromobenzene Butanol Butyl acetate Butylamine Butylchloride Butyric acid Calcium chloride Carbon tetrachloride Castor oil Cellosolve Cellosolve acetate Chlorine (dry gas) Chlorine water Chloroacetic acid Chlorobenzene Chloroform Chlorosulfonic acid Chromic acid Citric acid Colza oil Copper sulfate Cyclohexane Cyclohexanol Cyclohexanone... 

Other Reacts with strong alkalies and aluminum Oxidized by strong oxidizing agents such as chromic acid, with formation of phosgene and chlorine gas NFPA 1994 HSDB 1996... 

Gas Chromatography Analysis of Water for Pesticides. All analyses for pesticides in water were done by gas chromatography. Solvents used for extraction were checked by gas chromatography for purity and interferences and all glassware used in the extraction was cleaned in a chromic acid/sulfuric acid mixture. Standards consisted of mixtures of various pesticides (actual commercial formulations) suspended or dissolved in water. These aqueous standards were extracted in the same manner as unknown solutions. The standard concentrations encompassed the concentration of unknowns to be determined. A standard curve normally consisted of a set of four pesticide concentrations. Blanks were run and an internal standard (eicosane) was used. The internal standard concentration was kept constant for all analyses. The conditions for GC analysis were guided by the pesticides expected in the water. For the more complex mixtures, such as those employed in the synthetic waste and those encountered in the field, a 6 ft., 3 percent SE-30 on GAS CHROM Q column sufficed. A typical chromatogram of a complex pesticide mixture is shown in Figure 2. ( )... 

NH4)2Cr207 may he prepared hy the reaction of ammonia gas with chromic acid ... 

The anhydrous chromium (III) chloride may be obtained by heating the hydrated salt CrCls 6H2O with SOCI2 and subliming the product in a stream of chlorine at 600°C. Alternatively, the red-violet anhydrous chloride can be obtained by passing chlorine gas over a mixture of chromic oxide and carbon ... 

For the ferric oxide/aluminum (Fe 2O 3 /Al), manganese dioxide/ aluminum (MnO 2 /Al), and chromic oxide/magnesium (Cr 2O 3, /Mg) systems, slight gas phase involvement is indicated by the 3-4 fold rate increase observed as the external pressure is raised from 1 to 150 atm. The chromic oxide /aluminum system, however, reportedly burns at exactly the same rate - 2.4 millimeters /sec - at 1 and 100 atm suggesting that it is a true "gasless" system [1]. 

The halogenates of chromium, uranium, and manganese.—The double decomposition of chrome alum and barium chlorate, or a soln. of chromic sulphate and potassium chlorate, furnishes a violet liquid containing chromium chlorate,134 which becomes green at 65°. Even at ordinary temp, the soln. smells of chlorine at 100°, chlorine gas is given off and the liquid becomes reddish-yellow—it contains chromic... 

Method 6(when acardite III alone is present as stabilizer and gelatinizer) Procs a) to e)— same as in Method 4 f)In order to establish that the sample contains acardite III and not acardite 11, treat the solnfafter removal of N gas) with chromic mixt(KaCr207 + Ha S04) in order to oxidize ethanol to acetaldehyde. Treat the oxidized soln with fuchsin, previously... 

Twenty grams of powdered green chromic chloride are placed in a smaU rpund-bottomed flask and 60ml of freshly-distilled thionyl chloride are added. When evolution of gas has ceased, the mixture is refluxed for two hours, the excess liquid evaporated off in v and the product stored in a vacuum desiccator over pellets of solid alkali for at least ttheura. 

Magnesium Chromate. [CAS 13423-fil-5. MgCiCC SH.o, small readily soluble, yellow cryslals. formed by reaction ol magnesium carbonate and chromic acid solution. Use Since it does not produce a fusible alkaline residue when thermally decomposed, it is used as a corrosion inhibitor in the water coolant of gas turbine engines. Insoluble basic magnesium chromates also arc available. Their potential applications arc in the treatment of light metal surfaces. 

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