Accession Number : AD0622275

Title :   EVALUATION OF ANALYTICAL METHODS FOR THE DETERMINATION OF INTERSTITIALS IN MOLYBDENUM AND TUNGSTEN.

Descriptive Note : Final rept. for 15 Jun 64-31 May 65,

Corporate Author : LEDOUX AND CO INC TEANECK N J

Personal Author(s) : Kallmann,Silve ; Liu,Robert ; Oberthin,Hans ; Stevenson,Richard ; Lux,Frank

Report Date : AUG 1965

Pagination or Media Count : 48

Abstract : Analytical methods covering the determination of interstitial elements in tungsten and molybdenum (oxygen, carbon, hydrogen and nitrogen) were evaluated. Two samples of tungsten and two samples of molybdenum were analyzed for oxygen by vacuum fusion, inert gas fusion, and neutron activation techniques. Carbon methods investigated included combustion, followed by a coulometric, conductometric, or thermoconductometric finish, and also irradiation with 25 Mev gamma rays. Hydrogen methods evaluated were based on vacuum fusion and vacuum extraction. Nitrogen results became available either as a by product of vacuum fusion techniques or were obtained by variations of the micro-Kjeldahl procedure. The evaluation indicates that in competent hands a variety of techniques is capable of providing satisfactory results for oxygen, carbon and hydrogen. No proven chemical or instrumental method is available for the determination of less than 10 ppm of nitrogen. (Author)

Descriptors :   (*MOLYBDENUM, IMPURITIES), (*TUNGSTEN, IMPURITIES), (*CHEMICAL ANALYSIS, REFRACTORY METALS), OXYGEN, CARBON, HYDROGEN, NITROGEN, DETERMINATION, RADIOACTIVATION ANALYSIS, NEUTRON ACTIVATION, VACUUM APPARATUS, MELTING, TEST METHODS

Distribution Statement : APPROVED FOR PUBLIC RELEASE