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Determination of nitrogen in boron carbide with the Leco UO-14 Nitrogen Determinator

Description: Use of various metals as fluxes for releasing nitrogen from boron carbide in the Leco Nitrogen Determinator was investigated. Metals such as iron, chromium, and molybdenum that wet the graphite crucible all promoted nitrogen release. Tin, copper, aluminum, and platinum did not wet the graphite and were of no value as fluxes. A procedure for sample handling and the resulting performance of the method are described. The precision at 0.06 to 0.6 percent nitrogen averaged 4 percent relative standard deviation.
Date: November 1, 1977
Creator: Gardner, R.D.; Ashley, W.H. & Henicksman, A.L.
Partner: UNT Libraries Government Documents Department

THE DETERMINATION OF CHLORINE IN POLYURETHANE PLASTIC

Description: Chlorine may be determined in polyurethane by gravimetric or spectrophotometric techniques. The sample is burned in a special combustion tube with two oxygen inlets, the products of combustion are absorbed in a solution containing sodium hydroxide and hydrogen peroxide, and the chlorine is measured either gravimetrically as silver chloride or spectrophotometrically using mercuric thiocyanate and ferric perchlorate. Eighteen determinations of cblorine in known solutions of sodium chloroacetate or perchloric acid gave an average recovery of 98.3% with a standard deviation of 2.8%. (auth)
Date: October 1, 1959
Creator: Henicksman, A.L.; VanKooten, E.H.; Gardner, R.D. & Ashley, W.H.
Partner: UNT Libraries Government Documents Department

THE GRAVIMETRIC DETERMINATION OF TUNGSTEN IN URANIUM-TUNGSTEN ALLOYS

Description: Tungsten in uranium--tungsten alloys is determined by precipitating the tungsten from a cold sulfuric acid solution using alpha -benzoinoxime and cinchonine as the precipitating agents. The precipitate is dgnited at 800 deg C and weighed as WO/sub 3/. Results of 94 determinations on known samples containing 20 to 40 milligrams of tungsten in the presence of 1 to 8 grams of uranium showed an average recovery of 100.1% with a standard deviation of 0.7%. (auth)
Date: September 1, 1958
Creator: Carpenter, R.L.; Gardner, R.D.; Ashley, W.H. & Henicksman, A.L.
Partner: UNT Libraries Government Documents Department