Determination of Microamounts of Calcium, Magnesium and Aluminium in Titanium Metal

As the complete separation of calcium, magnesium and aluminium from titanium metal is difficult, it was examined by extracting titanous thiocyanate with ether, and satisfactory results were obtained. Photometric determination was carried out after separation by using chlorophenol azodihydroxynaphthalenesulfonate for calcium, titan yellow for magnesium and extraction of the oxinate for aluminium

Studies on the Analysis of Crude Metallic Titanium

Crude titanium metal contains titanium carbide, nitride, and dioxide, together with a small amount of impurities such as iron, aluminium, silicon, manganese, and magnesium. The determinations of those were attempted. In the determination of metallic titanium, the heating of the metal in oxygen stream resulted in the oxidations of metallic titanium, carbide and nitride, and the amount of the carbide and nitride could be obtained from the determination of carbon and nitrogen. By correcting those values, the amount of metallic titanium is calculated Titanium carbide was determined by the usual method of carbon determination, and the determination of titanium nitride was submitted to the Kjeldahl method after dissolving in sulfuric acid. Titanium dioxide can be determined from the residue obtained by the chlorine method and also by calculation, subtracting the amount of titanium in metallic titanium, titanium carbide, and titanium nitride from the total amount of titanium. Silicon was determined by the gravimetric method and iron by colorimetry of the thiocyanate. Aluminium was determined gravimetrically by the oxine method, and manganese by colorimetry after it was dissolved in sulfuric acid and oxidized with silver nitrate and ammonium persulfate. Magnesium was dissolved in sulfuric acid, and titanium was removed with ammonium chloride and ammonium hydroxide, and the filtrate was used for the determination of magnesium by the phosphate method

Spectrophotometric Determination of Microamount of Boron in Iron and Steel by Solvent Extraction

The microamount of boron in iron and steel was determined rapidly by a solvent extraction method. The sample was dissolved with sulfuric acid and hydrogen peroxide in a soft glass test tube. After boiling out the excess hydrogen peroxide by gentle heating, the solution was filtered through filter paper into a polyethylene separating funnel. Hydrofluoric acid was then added and the filtrate was allowed to stand for an hour at room temperature. Next methylene blue solution was added, the solution was extracted with dichloroethane, and the soluble boron was determined by measuring the absorbance of organic layer at 660 mμ against dichloroethane. The residue in the filter paper was ashed and fused with anhydrous sodium carbonate in a platinum crucible. The content was dissolved with sulfuric acid, transferred to a polyethylene separating funnel, and the spectrophotometric determination of insoluble boron was carried out with the same procedure as in the case of the soluble boron after addition of hydrofluoric acid. Other common constituents of iron and steel did not interfere with the procedure. The time required for this method was two hours

Separation and Determination of Rare Earth Elements in Iron and Steel. II : Determination of Cerium and Lanthanum in Iron and Steel

Cerium and lanthanum were isolated from the rare earth elements by the methods previously reported and determined by the following methods : (a) Cerium was oxidized to ceric ion state and methylene blue was added thereupon and after being extracted with benzene, the absorbancy was measured at 510 mμ ; (b) The isolated lanthanum was determined by flame photometry after dissolving in sulfuric acid, and then atomizing and exciting it by hydrogen-oxygen flame

Determination of Carbon in Aluminium Metals

The determination of carbon in aluminium metals was studied, by applying the method composed of the wet method using ferric chloride solution as the decomposition reagent of aluminium sample and the usual combustion method

On the Determination of Low Valency Titanium Compounds

The methods for the determinations of bivalent, trivalent titanium, metallic aluminium and total amounts of aluminium and chlorine in the reaction products of titanium tetrachloride with metallic aluminium were studied. The amounts of bivalent and trivalent titanium were respectively determined by dissolving the sample in ferric sulfate solution and water, and then by titrating each solution with potassium permanganate or ferric solution. The total amount of aluminium was determined with oxine after the separation of titanium with sodium hydroxide, and chlorine was determined by the usual gravimetric method as silver chloride. The metallic aluminium content was estimated from the residue obtained by dissolving the sample in water, by gravimetric or volumetric method

Separation and Determination of Rare Earth Elements in Iron and Steel. I

Recently "Mischmetall" is often used to manufacture high-alloy steels. This technique, however, requires accurate chemical analyses of rare earth elements in iron and steel. So a method was examined which is superior in simplicity, rapidity and accuracy to those ever used in this field. In the present study, rare earth elements were isolated from the many coexisting metals by one of the following three methods : (1) The principal constituent, iron, was extracted by methyl isobutyl ketone, then the remaining iron and chromium were separated by electrolysis and binally the rare earth elements were separated by precipitation as fluorides ; (2) For the sample containing tungsten, the precipitated tungsten trioxide was redissolved in ammonia water and by adding hydrogen fluoride the rare earth elements were regained as fluorides ; (3) The sample was dissolved in perchloric acid and hydrofluoric acid, and the rare earth elements were separated directly as fluorides