Determination of trace amounts of selenium and tellurium in nickel-based heat-resisting superalloys, steels and several metals by electrothermal atomic absorption spectrometry after reductive coprecipitation with palladium using ascorbic acid

✍ Scribed by Tetsuya Ashino; Kunio Takada

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 552 KB
• Volume: 312
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(95)00215-l

✦ Synopsis

Trace amounts of selenium and tellurium in nickel-based heat-resisting superalloys and constituent metals were separated by a reductive coprecipitation technique with palladium using ascorbic acid, and determined by electrothermal atomic absorption spectrometry. Selenium and tellurium each added in 1 pg amounts to solutions of metals (Ni, Al, Cr, Co, Cu, Mn, MO, V, Ti, Nb, Ta, W and Zr), were recovered by the proposed method. In all metals, both selenium and tellurium were quantitatively recovered in H2S0,, H,SO,-tartaric acid, H,SO,-oxalic acid or H,SO,-H,PO, solution. In Ni, Al, Nb, Ta, W and Zr, they were also quantitatively recovered in HF-H,SO, solution. This proposed method could be adapted to determine trace amounts of selenium and tellurium in several alloys (heat-resisting superalloys, stainless steels and high speed steels).