Accession Number:

ADA277724

Title:

Comparison of a Modified Kjeldahl and vacuum Fusion Techniques for Determination of Nitrogen in Tantalum Alloys

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC

Report Date:

1970-07-01

Pagination or Media Count:

21.0

Abstract:

This report compares results obtained for the determination of nitrogen in the tantalum-base alloys T-111 and T-222 by Kjeldahl and vacuum fusion procedures. The Kjeldahl method used consists of a rapid decomposition with HF-H3PO4-K2CrO4 followed by the highly sensitive colorimetry of nitroprusside-catalyzed indophenol. The vacuum fusion procedure described uses a platinum-tin bath, platinum flux technique. In the 5 to 25 ppm range, the relative standard deviation was 3 to 9 percent by the Kjeldahl procedure and 4 to 8 percent by vacuum fusion. The agreement of the nitrogen results by the two techniques is considered satisfactory.

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry
  • Properties of Metals and Alloys
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE