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| Title: | Preconcentration of trace cobalt with the ion pair of 2-(5-bromo-2 paridylazo)-5-diethylaminophenol and tetraphenylborate onto microcrystallin naphthalene column method and its determination by derivative spectrophotometry |
| Authors: | Pancras, J Patrick
Puri, Bal Krishan
Taher, Mohammad Ali
Dehzoei, Ali Mostafavi
Sheibani, Ali |
| Keywords: | Cobalt determination
Derivative spectrophotometry
5-Br-PADAP
TPB
Naphthalene
Standard alloys
Biological samples |
| Issue Date: | 1998 |
| Citation: | Talanta, 46(4), 1107–1113 |
| Abstract: | Cobalt-2-(5-bromo-2-pyridylazo)-5- iethylaminophenol (5-Br-PADAP)- etraphenylborate ion associated complex is
quantitatively adsorbed on microcrystalline naphthalene in the pH range 3.5–9.5 from a fairly large volume of the aqueous samples (preconcentration factor -30). After filtration, the solid mass consisting of the cobalt complex and naphthalene was dissolved with 5 ml of dimethylformamide (DMF) and the metal determined by first-derivative spectrophotometry. The cobalt-5-Br-PADAP complex can alternatively be quantitatively retained on ammonium
tetraphenylborate-naphthalene adsorbent filled in a column (preconcentration factor 120) in the same pH range and determined similarly. The detection limit is 30 ppb (signal-to-noise ratio=2) and the calibration curve is linear over 0.3–8.0 mg of cobalt in 5 ml of the final DMF solution. Eight replicate determinations of 1.0 mg of cobalt gave a mean peak height of 0.208 (at 611.5 nm) with a relative standard deviation of 1.2%. The sensitiv... |
| URI: | http://eprint.iitd.ac.in/dspace/handle/2074/590 |
| Appears in Collections: | Chemistry
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| pancraspre1998.pdf | | 200Kb | Adobe PDF | View/Open |
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