Vin Y Y, Khopkar S M
Department of Chemistry, Indian Institute of Technology, Bombay 400 076, India.
Talanta. 1991 Sep;38(9):971-5. doi: 10.1016/0039-9140(91)80311-m.
A novel method is developed for the reversed-phase extractive chromatographic separation of niobium and tantalum with bis(2-ethylhexyl)phosphoric acid. Niobium is extracted from 1-10M hydrochloric acid and can be stripped with 3M sulphuric acid containing 2% hydrogen peroxide. Tantalum is extracted from 0.1-2M hydrochloric acid and can be stripped with 0.1M hydrochloric acid containing 2M tartaric acid. It is possible to separate niobium and tantalum, in different ratios, from multicomponent mixtures.
