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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/109

Title: Preconcentration of iron (III), cobalt (II) and copper (II) nitroso-R complexes on tetradecyldimethylbenzylammonium iodide-naphthalene adsorbent
Authors: Puri, Bal K
Balani, Sanjay
Keywords: insoluble neutral ion associated complex
5 ml dimethylformamide/chloroform
Ten replicate determinations
and anions on the estimations of these metals
Issue Date: 1995
Citation: Tahmta 42 ( 3 ) 337- 344
Abstract: Iron, cobalt and copper form coloured water soluble anionic complexes with disodium 1-nitroso-2-naphthol-3-6-disulphonate (nitroso R-salt). The anionic complex is retained quantitatively as a water insoluble neutral ion associated complex (M-nitroso R-TDBA) on tetradecyldimethylbenzylammonium iodide on naphthalene (TDBA+l -naphthalene) packed column in the pH range of: Fe(lll): 3.1 6.5, Co: 3.4 8.5 and Cu 5.9-8.0 when their solutions are passed individually over this adsorbent at a flow rate of 0.5 5.0 ml/min. The solid mass consisting of an ion associated metal complex along with naphthalene is dissolved out of the column with 5 ml dimethylformamide/chloroform and metals are determined spectrophotometrically. The absorbance is measured at 710 nm for iron, 425 nm for cobalt and 480 nm for copper. Beers law is obeyed in the concentration range 9.2 82 ttg of iron, 4.2 7.2 #g of cobalt and 3.0 62 /~g of copper in 5 ml of final DMF/CHC13 solution. The molar absorptivities are calculated to be Fe: 7.58 × 103, Co: 1.33 × 104 and Cu: 4.92 x 104M ' cm '. Ten replicate determinations containing 25/~g of iron, 9.96/~g of cobalt and 3.17/lg of copper gave mean absorbances 0.677, 0.450 and 0.490 with relative standard deviations of 0.88, 0.98 and 0.92%, respectively. The interference of large number of metals and anions on the estimations of these metals has been studied. The optimized conditions so developed have been employed for the trace determination of these metals in standard alloys, waste water and fly ash samples.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/109
Appears in Collections:Chemistry

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