痕量钴、镍的液膜分离及石墨炉原子吸收光谱法测定

The Separation and Enrichment of Trace Cobalt and Nickel and their Determination by Graphite Furnace Atomic

本文采用P204和P507两个液膜体系并控制适当的外相酸度,实现了ppb级Co^(2+)与Ni^(2+)的相互分离与富集。分离系数可达180,回收率为95～100%。本法与石墨炉原子吸收法相结合,测定了天然水中ppb级的Co^(2+)和Ni^(2+),结果令人满意。

Trace cobalt and nickel at ppb level can be separated from each other and enriched simultaneously with liquid membrane technique. In accordance with the present work, Co and Ni were separated from each other with P507-N205-liquid paraffin-kerosene-H_2SO_4 liquid membrane system at pH4.8, and enriched simultaneously with P204-N205-liquid paraffin-kerosene-H_2 SO_4 liquid membrane system at pH4.4. The mean recoveries of Co or Ni were 95～100%, the separation coefficient was 180. By the use of graphite furnace atomic absorption spectrophotornetry, trace cobalt and nickel in natural water were determined. The results were satisfactory.