Designation:E1409-13 INTERNATIONAL StandardTestMethodfor Determination of Oxygen and Nitrogen in Titanium and TitaniumAlloysbyInertGasFusion' This standard is issued under the fixed designation E1409; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. 1. Scope analyzers typically measure both oxygen and nitrogen simul- 1.1 This test method covers the determination of oxygen in titanium and titanium alloys in mass fractions from 0.01 % to tems. O0.5%andthedeterminationofnitrogenintitaniumand 4.2 The test sample, plus flux, is fused in a graphite crucible titanium alloys in mass fractions from 0.003 % to 0.11 %. under a flowing inert gas stream at a temperature sufficient to 1.2 This standard does not purport to address all of the release oxygen and nitrogen.Oxygen combines with carbon to safety concerns,if any,associated with its use.It is the form carbon monoxide (CO) and nitrogen is released as N2 responsibility of the user of this standard to establish appro- Depending on instrument design, the CO may be oxidized to priate safety and health practices and determine the applica- carbon dioxide (CO2). The CO or CO2, or both, are swept by bility of regulatory limitations prior to use.Specific warning the inert gas stream into either an infrared or thermal conduc- tivity detector. The detector response generated by analysis of statementsaregivenin8.8 the test sample is compared to the response generated by 2.Referenced Documents analysis of reference materials and the result is displayed as 2.1ASTM Standards:2 percent oxygen.The nitrogen is swept by the inert gas stream E50 Practices for Apparatus, Reagents, and Safety Consid- into a thermal conductivity detector. The detector response erations for Chemical Analysis of Metals, Ores, and generated by analysis of the test sample is compared to the Related Materials response generated by analysis of reference materials and the E135Terminology Relating to Analytical Chemistry for result is displayed as percent nitrogen. Metals, Ores, and Related Materials 4.3 In a typical instrument for the determination of nitrogen, E173 Practice for Conducting Interlaboratory Studies of the sample gases are swept with inert gas through heated rare Methods for Chemical Analysis of Metals (Withdrawn earth/copper oxide that converts CO to CO, and hydrogen (H2) 1998)3 to water (H,O). The CO, is absorbed on sodium hydroxide E1601 Practice for Conducting an Interlaboratory Study to impregnated on clay, and the H,O is removed with magnesium EvaluatethePerformanceof anAnalyticalMethod perchlorate. The nitrogen, as N2, enters the measuring cell and the thermistor bridge output is integrated and processed to 3.Terminology display percent nitrogen. 3.1 Definitions-For definitions of terms used in this 5. Significance and Use method, refer to Terminology E135. 5.1 This test method is primarily intended as a test for 4. Summary of Test Method compliancewithcompositionalspecifications.Itis assumed that all who use this test method will be trained analysts 4.1 This test method is intended for use with automated, commercially available, inert gas fusion analyzers. These capable of performing common laboratory procedures skill- fully and safely. It is expected that the work will be performed in a properly equipped laboratory. EIon Analytical Chemistryfor Metals,Ores, and Related Materials and is the direct responsibility of Subcommittee E01.06 on Ti, Zr, W, Mo, Ta, Nb, Hf, Re. 6. Interferences Current edition approved Oct. 1, 2013. Published November 2013. Originally approved in 1991. Last previous edition approved in 2008 as E1409-08. DOI: 6.1 The elements usually present in titanium and its alloys 10.1520/E1409-13. do not interfere but there is some evidence to sugg