1.1 This test method applies to the determination of carbon in refractory and reactive metals and their alloys in concentrations from 0.004 to 0.100 % (see Note 1). Note 1 -Actual instrument range might vary from manufacturer to manufacturer and according to sample size. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 8.