title: Comparison of an instrumental and modified Kjeldahl technique for determination of nitrogen in niobium and tantalum alloys.
abstract: Results obtained for the determination of nitrogen in two tantalum alloys and six niobium alloys by modified Kjeldahl and Leco TC-30 nitrogen-oxygen determinator are compared. In the 5-25 ppm range, for tantalum alloys, the relative standard deviation was 3-9% by the Kjeldahl procedure and 9-11% by the instrumental technique. In the range 30-80 ppm, for niobium alloys, the relative standard deviation was 2-8% by the Kjeldahl procedure and 5-7% by the instrumental technique.
authors.affiliation: Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio, USA.
authors.forename: E J
authors.initials: EJ
authors.lastname: Merkle
authors.forename: J W
authors.initials: JW
authors.lastname: Graab
authors.forename: W F
authors.initials: WF
authors.lastname: Davis