Spectrophotometric Determination of Vanadium with 2 2'-Diamino-Diphenyl-Disulphide in Strong Acid Solution
| Main Authors: | S. P. BAG, AMARJYOTI BASU, A. B. CHATTERJEE |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1982
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6360972 |
Daftar Isi:
- Department of Chemistry, Jadavpur University, Calcutta-700 032 Manuscript received 16 January 1981, revised 18 December 1981, accepted 11 March 1982 Vanadium(V) forms a 1 : 1 (M : R) cornflower blue complex with 2 : 2'-diaminodiphenyl-disulphide in 18 N sulphuric acid solutions, which passes on to 1 : 2 (M : R) complex with larger amounts of reagents. The absorption maxima of the complexes are 590 nm and 700 nm, respectively. The colour system obeys Beer's law from 8 to 36 ppm with optimum concentration range being the same for vanadium. The percent relative error is 2.72. The compositions of the complexes were determined by the modified Job's and molar ratio methods. The calculated dissociation constants are 1.6 x 10-2 and 5 x 10-9 at 25°. The molar extinction coefficient is 1100 while the Sandell's sensitivity is 0.046 μg/cm2. Vanadium can be determined in the presence of large excess of foreign ions, both cations and anions.