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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3026
Title: Selective extractive spectrophotometric determination of cobalt using cyanex 923
Authors: Gupta B.
Deep A.
Singh V.
Tandon S.N.
Published in: Indian Journal of Chemical Technology
Abstract: The present paper describes a selective extractive spectrophotometric method for the determination of Co(II) using toluene solution of cyanex 923. A blue coloured complex (λmax 685 nm) is quantitatively extracted in the organic phase from 7-10 mol L- 1 HCl. The composition of this complex is proposed as H2CoCl 4.2cyanex 923. The Beer's law is obeyed in the concentration range 0.0-4.2 × 10-3 mol L-1 Co(II) and the molar absorptivity of the complex is 5.6 × 102 L mol-1 cm-1. The presence of hundred fold excess of metal ions such as Mo(VI), W(VI), V(V), Ti(IV), V(IV), Al(III), Cr(III), Fe(III), Mn(II), Fe(II), Ni(II), Cu(II), Zn(II) and Cd(II) and fifty fold of anions namely PO 43-, SO42-, C2O 42-, citrate, tartrate, NO3- and SCN- do not interfere in the determination of Co(II). The accuracy of proposed procedure is checked by assaying the concentration of cobalt in two standard NBS steel samples. The applicability of the method is demonstrated by selective determination of Co(II) in a multi element system like polymetallic manganese sea nodules. The result is in fairly good agreement with those obtained by AAS and ICP-AES.
Citation: Indian Journal of Chemical Technology (2004), 11(4): 470-474
URI: http://repository.iitr.ac.in/handle/123456789/3026
Issue Date: 2004
Keywords: Cobalt
Cyanex 923
Extractive spectrophotometry
ISSN: 0971457X
Author Scopus IDs: 7402195167
6602909701
55468431200
24523635700
Author Affiliations: Gupta, B., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Deep, A., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Singh, V., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Tandon, S.N., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Corresponding Author: Gupta, B.; Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India; email: bvgcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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