Determination of Trace Arsenic and Selenium in Copper and Nickel Powders by Hydride-Generation Atomic Absorption Spectrometry after Chelex Separation

摘要

Trace arsenic and selenium in copper or nickel powder were determined, after separation with Chelex 100 resin, by hydride-generation atomic absorption spectrometry in the presence of masking agents. When recoveries of arsenic or selenium were checked in the presence of copper or nickel ion in solution, they were quantitative. On the contrary, the recoveries of arsenic or selenium added to copper powder were not quantitative without masking agents, which may be due to partial elution of copper from the resin. Accuracies tested with an NBS Standard Reference Material were within the certified values.