SD-OES - Spark discharge atomic emission spectral analysis
Spark discharge optical atomic emission spectral analysis (SD-OES) in accordance with RA 101 evaporates small amounts of the material from a test body using an arc and makes it glow. Through spectral decomposition the relative intensity is determined for an element-specific wavelength and the elementary chemical composition is calculated from that. This procedure has been standardized for all current alloys (e.g. ASTM E415 for unalloyed and low-alloy steel, ASTM E1086 for high-alloy steel).