New Substituted Hydroxamic Acid Derivatives as Spectrophotometric Reagents for Niobium (V)
| Main Authors: | C. P. SAVARIAR, JOY JOSEPH |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1973
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6424617 |
Daftar Isi:
- Department of Chemistry, University of Calicut, Caliout Manuscript received 7 July 1970; accepted 10 August 1970 Methyl and halogen substituted derivatives of N-acetylsalicyloyl-N-phenylhydroxylamine (ASPHA.) and N-p-nitrobenaoyl-N-phenylhydroxylamine are synthesised and used for the spectrophotometric determination of niobium (V). These reagents form deep yellow complexes with niobium (V) and thiocyanate in strong hydrochloric acid media which can be extracted into carbon tetrachloride or cnloroform. The complexes absorb strongly around 400 nm and the sensitivities are about 0.005 μg. Nb per mt. A large excess of associated ions including Ta(V) are tolerated.