Determination of Oxygen and Nitrogen Elements in High-Purity Metal Rhenium by Infrared Absorption/Thermal Conductivity Method with Inert Gas Fusion

A method for determination of oxygen and nitrogen elements in high-purity metal rhenium by infrared absorption/thermal conductivity method with inert gas fusion was proposed. The high-purity metal rhenium sample was taken and ground by a mechanical device. The sample was cleaned with acetone by ultrasonic waves and dried. 0.10-0.30 g of the sample was taken and placed in a nickel basket with nickel bag. The mixture was sealed and put in the sample hole for determination. The calibration curve was established by the single point calibration method. As shown by the results, linear relationships between the corresponding integral intensities and mass fractions of oxygen and nitrogen elements were kept in definite ranges, with detection limits (3s) of 0.000 5% and 0.000 05%, respectively. RSDs (n=8) of the determined values of actual samples were less than 7.0%. Test for recovery was made by the standard addition method, giving results in the range of 83.3%-128%. The determined values of this method were basically consistent with those of the inert gas fusion-gas chromatography method.