A simple and fast analytical method for complex Ni-based and Co-based heat-resistant alloys has been developed by inductively coupled plasma/atomic emission spectrometry (ICP-AES). Heat-resistant alloys of widely varying composition are dissolved in a mixture of hydrofluoric acid and nitric acid. A demountable hydrofluoric acid-resistant sample introduction system was used in which the surface of polytetrafluoroethylene (PTFE) parts was treated with metallic Na to improve the wetting property of the PTFE. Synthetic standard solutions are used for the calibration. Major and minor alloying elements are determined. The calibration curve method and internal standard method are compared. The internal standard method used two spectrometers and Mg as an internal standard element.
Osamu Kujirai, Kei Yamada, Muneyuki Kohri, and Haruno Okochi, "Analysis of Heat-Resistant Alloys by Inductively Coupled Plasma/Atomic Emission Spectrometry with Hydrofluoric Acid-Resistant Sample Introduction Systems," Appl. Spectrosc. 40, 962-968 (1986)