β Scribed by Thomas M. Drown; P.W. Shimer; M.E. Easton
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Tile prec!pitation of phosphoric with titanic acid by boiling an iron solution which had been reduced to the ferrous condition by sulphuretted hydrogen or sulphurous acid was first noticed by E. H. Bogardus in 1874.* Since that time, as far as we are aware, not much has been published on the relation of these two acids to each other, and to silicie acid in the ordinary course of analysis of iron ores. The following investigation may perhaps aid in clearing up some of the obscure points in the analysis of titanlferous ores. THE ])ETERMINATION OF PHOSPHORUS.
From two to five grammes of the finely powdered ()re are weighed into a beaker and treated with abont 50 ee. of hydrochloric acid (sp. gr. 1"12), evaporated to dryness, and heated in an air-bath for an hour to 110 Β° to 120Β°C. To the dry nmss are added 50 co. of hydrochloric acid (1"12), and the solution filtered off from the insoluble residue. On washing this residue with water the filtrate often runs through turbid. This can be avoided by washing with dilute nitric acid, or, better, with an acid solution of ammonium nitrate. The filtrate contains the greater part of the phosphoric acid, but the residue may courain a notable amount.
Treatme~t of the Resid~tc.--Fuse the residue with sodium carbonate and extract with water. Sodium phosphate and silicate go into solution and sodium titanate remains insoluble. Filter, acidify the filtrate with nitric acid, evaporate to dryness, moisten with nitric acid, and dissolve in water. Filter from the silica, concentrate the filtrate, neutralize nearly with ammonia, and precipitate with ammonium molybdate. This is the best method of separating the phosphorus. from the insoluble residue. The bulk of the phosphorus may, however, be extracted from the moist residue by washing with ammonia.
Treatment of the Filtrate.--Evaporate to a small bulk, and add
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The peeling reaction, the process by which oligosaccharides are degraded in alkali, was used as the basis for an assay to provide structural information about glycosidically linked oligosaccharides in glycoproteins. Glycoproteins were treated with 0.05 M NaOH at 50 degrees to induce release, and sub
In an earlier report' on complexes of iron(III) with 2,3\_dihydroxypyridine in various media which were all nominally 1 M in hydrogen ion, phosphoric acid was found to produce anomalous effects. Further investigations of such solutions are reported here. In phosphoric acid media, iron(III) and 2,3\