Iron Identification Test

Identification A sample responds to the Identification Tests in the monograph for Ferric Ammonium Citrate, Brown. Assay Not less than 14.5% and not more than 16.0% of iron (Fe). 

B. A portion of the filtrate obtained in Identification Test A gives positive tests for Iron, Appendix IIIA. 

There are three identification tests for benzoates in the European Pharmacopoeia, test (a) in which benzoate is precipitated with a ferric salt to get the above-mentioned insoluble iron(III) salt, and test (b) and test (c), where the physical properties of benzoic acid are used for identification. 

To be able to identify both iron(II) and iron(lll) and distinguish between them, three different identification tests are described in the pharmacopoeia. 

Bosch and co-workers devised laboratory reactors to operate at high pressure and temperature in a recycle mode. These test reactors had the essential characteristics of potential industrial reactors and were used by Mittasch and co-workers to screen some 20,000 samples as candidate catalysts. The results led to the identification of an iron-containing mineral that is similar to today s industrial catalysts. The researchers recognized the need for porous catalytic materials and materials with more than one component, today identified as the support, the catalyticaHy active component, and the promoter. Today s technology for catalyst testing has become more efficient because much of the test equipment is automated, and the analysis of products and catalysts is much faster and more accurate. 

The "classic combinations" of elements arise due to specific problem identification. Some of the elements such as silicon, iron, chromium and aluminum are from the wear of liners and rings pistons or from the air induction system and contamination. Lead, tin and aluminum are from the wear of bearings and pistons, from lack of lubrication and coolant contamination. A sudden upward change above the maximum concentration limit mentioned above of any metallic element suggests an increased wear rate, and possibly abnormal operating conditions (Erickson and Taylor, 1984). The interpretation of wear analyses is often greatly enhanced by additional tests which detect contamination of fuel, water and antifreeze. 

Identification A 1 10 aqueous solution gives positive tests for Ferric Iron and for Citrate, Appendix IIIA. 

Identification A sample gives a positive test for Iron (Ferrous Salts), Appendix IIIA. 

Identification A 1 50 aqueous solution gives positive tests for Lactate and for Iron (Ferrous Salts), Appendix IIIA. Assay Not less than 97.0% and not more than 100.5% of C6H10FeO6, calculated on the anhydrous basis. 

Identification A sample gives positive tests for Ferrous Salts (Iron) and for Sulfate, Appendix IHA. 

Identification A sample dissolves in dilute mineral acids with the evolution of hydrogen and the formation of solutions of the corresponding salts, which give positive tests for Ferrous Salts (Iron), Appendix IIIA. 

Identification The infrared absorption spectrum of the sample exhibits relative maxima at the same wavelengths as those of a typical spectmm as shown in the section on Infrared Spectra, using the same test conditions as specified therein. Assay Not less than 9.0% and not more than 20.0% of ketones, calculated as irone (Q4H22O). 

Identification of a Sulphonic Acid by Conversion into a Phenol (SECTION 477).—Melt about 1 gram of sodium hydroxide in a small iron or porcelain crucible, and add to the fused mass about 0.5 gram of sodium benzenesulphonate. Keep the mixture just above its melting-point, and do not let it char. Stir occasionally during 5 minutes. Cool, dissolve in water, acidify with dilute hydrochloric acid, and note the odor produced. Filter and add bromine water, drop by drop. Write equations for all the reactions involved in the test. 

Further proof that cyclobutadiene liberated by ceric oxidation of the iron carbonyl complex is completely free of the metal comes from an ingenious new three-phase test for reactive intermediates which resembles the Paneth test for free radicals in its basic flow design. Thus, a cyclobutadiene-iron carbonyl complex bound to a support of polymer beads is treated as a suspension with Ce in the presence of separate polymer beads to which a trapping agent (maleimide) is bound. The resulting adduct is then liberated from the second polymer by hydrolysis for identification, its isolation... 

A photoelectric colorimeter was used by Faure and Pallu (1936) for the color of the tannin-iron complex. Kretzdorn (1949) also tested an iron chloride procedure, but citric acid (1 % to 3%) interfered. The hide-powder method was applied to dealoohol-ized wines by Ponte and Gualdi (1931). Feigl and Feigl (1946) proposed use of ,a -ferrous dipyridyl sulfate or a,a -ferrous phenanthroline sulfate for the colorimetric identification of tannin. Synthetic tannins did not react and seven red and white wines gave positive tests. 

This service test method covers procedures for the identification and measurement of the extent of carburization in a metal sample and for the interpretation and evaluation of the effects of carburization. It applies mainly to iron- and nickel-based alloys for high-temperature applications. Four methods are described ... 

Uranyl salts react with a-nitroso-jS-naphthol to form a yellow precipitate. It is therefore necessary to take precautions in the presence of uranium, especially when testing for small amounts of cobalt. Uranium may be converted into the non-reacting phosphate by treatment with ammonium phosphate. The test is then carried out as in the presence of iron salts. Limit of Identification 0.26 y cobalt in the presence of 1000 times the Limit of Dilution 1 200,000 ) amount of uranium... 

Procedure. The test can be carried out by placing one drop of the test solution and one of potassium ferrocyanide solution on filter paper or a spot plate. Limit of Identification 0.1 y iron (on paper)... 

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