Comparison of an instrumental and modified Kjeldahl technique for determination of nitrogen in niobium and tantalum alloys |
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Authors: | Merkle E J Graab J W Davis W F |
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Institution: | Lewis Research Center, National Aeronautics and Space Administration, Cleveland Ohio, U.S.A. |
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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. |
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