|Title:||Solvent Extraction and Spectrophotometrig Determination of Cobalt (III) and Iron (III) with Nshydroxy-N,Ni-Diphenylbenzamidine in Pre6ence of Azide|
|???metadata.dc.contributor.*???:||Dr. B. S. Chandravanshi|
|Publisher:||Addis Ababa University|
|Abstract:||N-Hydroxy-N,NT-diphenylbenzamidine (HDPBA)1.a bidentate chelating agent, reacts with cobalt(III) and iron(III) in the presence of azide to give a pinkish red and red-violet coloured mixed ligand complexes, which are quantitatively extractable into chloroform from the aqueous phase at pH 7.4-7.8 and 2-5 respectively,. allowing spectrophotometric determinations of the metal ions. The cobalt(III) and iron(III) mixed ligand complexes have wavelengths of maximum absorption at 520 and 520-540 nm with their respective molar absorp- tivities of 1980 lit, mole'l cm'1 and 4895 lit. mole ,1 cm . Beer's Law obeys from 3.6 to 24 ppm for cobalt(III) and from 146 to 11,2 gpm for iron(III). The effect of foreign ions and several other experimental variables have been studied.. The composition of the cobalt(III) and iron(III) mixed ligand complexes have been determined by spectrophotometric methods • and are found to be 1:1:2 (Go: HDPBA:Np- and 1:2:2 (Fe:HDPBA:N) respectively. On the basis of the differences in the pH of the reaction media for iron(III) and cobalt(III), a separation procedure for the two metals in a solution has been established followed by spectrophotometric determinations. The method has allowed the separation and determination of varied proportions of iron(III) and cobalt(III) in a solution of the two metal ions. :Moreover, the methods have been applied, successfullyfor the separation and determination of cobalt and iron in synthetic samples. a solution of the two metal ions. Moreover, the methods have been applied successfully for the separation and determination of cobalt and iron in synthetic samples.|
|Description:||Thesis Presented to the School of Graduate Studies Addis Ababa University in Partial Fulfillment of the Requirement for the Degree of Master of Science in Chemistry|
|Appears in Collections:||Thesis - Chemistry|
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